Journals >Chinese Journal of Quantum Electronics
Contents
2005
Volume: 22 Issue 6
26 Article(s)
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Research Article
Progress of the research on quantum feedback control
[in Chinese], and [in Chinese]
The idea of feedback to actively control of quantum systems is introduced into quantum feedback control theory, which becomes more and more important part in quantum optics, atomic physics and quantum information theory. In consideration of differences between several feedback strategies, the progress of the research oThe idea of feedback to actively control of quantum systems is introduced into quantum feedback control theory, which becomes more and more important part in quantum optics, atomic physics and quantum information theory. In consideration of differences between several feedback strategies, the progress of the research on quantum feedback control theory is reviewed, Markovian quantum feedback, Bayesian quantum feedback, non-Markovian quan- tum feedback with time delay and coherent quantum feedback are analyzed and expounded, and the four feedback strategies are also compared..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 833 (2005)
Nano-photolithography using super-resolution near-field structure
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
Super-resolution near-field structure （Super-RENS） is a newly developed technology based on traditional super-resolution optical disk and near-field optics. The principle of super- RENS and its applications in nano-photolithography are reviewed. The broad muti-mask-layer structure that can realize super-resolution beyoSuper-resolution near-field structure （Super-RENS） is a newly developed technology based on traditional super-resolution optical disk and near-field optics. The principle of super- RENS and its applications in nano-photolithography are reviewed. The broad muti-mask-layer structure that can realize super-resolution beyond diffraction limit is called Super-RENS. The investigation on surface plasmons in nano-optics is very import.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 840 (2005)
Measurement for chlorine utilization in a minitype singlet oxygen generator
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The measuring system for chlorine utilization was built on a minitype jet singlet oxygen generator （JSOG）. The influence of light-source bandwidth, gas temperature, water vapor content and other gas components on the chlorine utilization measured by UV absorptiometry was experimentally and theoretically studied in detaThe measuring system for chlorine utilization was built on a minitype jet singlet oxygen generator （JSOG）. The influence of light-source bandwidth, gas temperature, water vapor content and other gas components on the chlorine utilization measured by UV absorptiometry was experimentally and theoretically studied in detail. For a well designed experimental setup, the relative error for the chlorine utilization measurement was about ±2%, which mainlv caused by the noise of the photomultiplier （PMT）. On the basis of error analysis, a method to further decrease the measuring error and also extend the measuring range of chlorine utilization was proposed. This study will be helpful for the accurate chlorine utiliza- tion measurement in the singlet oxygen generator （SOG） for a chemical oxygen iodine laser （COIL） system..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 844 (2005)
M^2 of nonparaxial truncated cosh-Gaussian beams
[in Chinese], and [in Chinese]
Based on the second-order moment of the power density, the beam width,far-field divergence angle and M2 factor of nonparaxial truncated cosh-Gaussian （ChG） beams are studied. It is found that the M^2 factor of nonparaxial truncated ChG beams depends not only on the truncation parameter δ, decentered parameter α, but alBased on the second-order moment of the power density, the beam width,far-field divergence angle and M2 factor of nonparaxial truncated cosh-Gaussian （ChG） beams are studied. It is found that the M^2 factor of nonparaxial truncated ChG beams depends not only on the truncation parameter δ, decentered parameter α, but also on the initial waistwidth to wavelength ratio ωo/λ. M^2 may be less than one when d is small enough. As δ→0, the far-field divergence angle approaches an asymptotic value of θmax = 63.435°. For the special cases of α = 0（Ω0 = 0） and δ→∞ our results reduce to the M^2 of nonparaxial truncated Gaussian beams and nonparaxial untruncated ChG beams, respectively.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 851 (2005)
Analysis for optimized design and thermal lens effect of LD-pumped solid-state laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Laser techniques is surging with LD-pumped solid-state laser. But, the stability, model and beam quality of the laser are strongly affected by the thermal lens effect at high power. A few estimated equations of the thermal lens focal length fT and quality beam M^2 factor were introduced;a few advanced designs of cavityLaser techniques is surging with LD-pumped solid-state laser. But, the stability, model and beam quality of the laser are strongly affected by the thermal lens effect at high power. A few estimated equations of the thermal lens focal length fT and quality beam M^2 factor were introduced;a few advanced designs of cavity to compensate the thermal lens were analysed.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 855 (2005)
New power supply with high performance for pulse laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new switching power supply with the function of constant-voltage and restricted- current for middle power pulse laser is presented. The operation principle and control principle of the power is analyzed, and the implement circuit is also provided. Experimental results show the power supply has excellent performance ,A new switching power supply with the function of constant-voltage and restricted- current for middle power pulse laser is presented. The operation principle and control principle of the power is analyzed, and the implement circuit is also provided. Experimental results show the power supply has excellent performance , fast dynamic response. Compared with the traditional products, the input current ripple can be decreased remarkable, the circuit relative simple and reliable..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 859 (2005)
Fine-structure mixing in 52p Rb atoms studied through excitation transfer and energy-pooling collisions
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
Rb atoms were excited to the 5P3/2 level using a single-mode laser diode. The 5P3/2 state atom density was measured bv the absorption of line from a Rb hollow-cathode lamp. The excited atom density is combined with measured fluorescence ratio to determine collisional cross section for the energy pooling process [i.e. RRb atoms were excited to the 5P3/2 level using a single-mode laser diode. The 5P3/2 state atom density was measured bv the absorption of line from a Rb hollow-cathode lamp. The excited atom density is combined with measured fluorescence ratio to determine collisional cross section for the energy pooling process [i.e. Rb（5P3/2）＋Rb（5P3/2）→Rb（5D）＋Rb（5S）]. The cross section is （5.0＋1.9）×10^-14cm^2. Cross section for 5P3/2 →5P1/2 transfer in Rb, induced in collision with ground-state Rb atoms, has been determined using methods of atomic fluorescence. The resulting fluorescence included a direct component arising from the optically excited state and a sensitized component due to the collisionally populated fine-structure state and the energy-pooling collisions. Measurement of relative intensities of the two components yielded the following cross section： σ （5P3/2 →5P1/2）=（3.0＋0.9） ×10^-15cm^2. it is found that the rate for the energy pooling is an order of magnitude more efficient than 5P3/2→5P1/2 mixture. Comparisons of our result with other experiments have been made..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 863 (2005)
Study on quantum key bit rate in free-space quantum cryptography
[in Chinese], [in Chinese], and [in Chinese]
The expressions of the quantum key bit rate are given for free-space quantum key distribution by introducing the quantum channel transmission, the single-photon acquisition probability, the detection factor and the sifting factor. The quantum key bit rate is studied in the numerical simulation for the laser links betweThe expressions of the quantum key bit rate are given for free-space quantum key distribution by introducing the quantum channel transmission, the single-photon acquisition probability, the detection factor and the sifting factor. The quantum key bit rate is studied in the numerical simulation for the laser links between a ground station and a satellite in a low earth orbit, The results show that it is feasible to implement quantum key distribution between a ground station and a satellite in a low earth orbit.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 868 (2005)
Quantum associative memory based on entanglement
[in Chinese], and [in Chinese]
An approach to constructing an artificial quantum associative memory based on entanglement （QuEAM） is discussed. The QuEAM is an exponential increase in the capacity of the memory when compared to classical associative memories such as the Hopfield network. According to the characteristics of amount of entanglement, thAn approach to constructing an artificial quantum associative memory based on entanglement （QuEAM） is discussed. The QuEAM is an exponential increase in the capacity of the memory when compared to classical associative memories such as the Hopfield network. According to the characteristics of amount of entanglement, the study algorithm based on Grover＇s well-known algorithm is locally magnified the probability amplitude for the qubit. The basic principle of entangled states is discussed. Concrete examples illustrating the properties of the proposed model are also presented..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 873 (2005)
Effects of cigar-shaped traps on switching and self-trapping of two Bose-Einstein condensate solitons
[in Chinese], [in Chinese], and [in Chinese]
The characteristics of switching and self-trapping of two Bose-Einstein condensate （BEC） solitons trapped in the cigar-shaped harmonic traps are investigated by the variational approach. The effects of the cigar-shaped traps on the in-phase and the out-of phase solutions of the NLSE in the stationary states are discussThe characteristics of switching and self-trapping of two Bose-Einstein condensate （BEC） solitons trapped in the cigar-shaped harmonic traps are investigated by the variational approach. The effects of the cigar-shaped traps on the in-phase and the out-of phase solutions of the NLSE in the stationary states are discussed by performing a standard linear stability analysis. It is shown that the cigar-shaped traps affect the evolution of the BEC shift population transferring ratio, and change the characteristics of switching and self-trapping of two BEC solitons.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 879 (2005)
Band gap structure and filter properties of with quasiperiods one dimensional photonic crystals
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The band gap structure and filter properties in one dimensional photonic crystals with quasiperiods were studied. The transmission spectra were calculated in photonic crystal with quasiperiodic structure arranged alternatingly by ZnS and MgF2 or GaAs and AlAs as the thickness of layers unchanged and the index of refracThe band gap structure and filter properties in one dimensional photonic crystals with quasiperiods were studied. The transmission spectra were calculated in photonic crystal with quasiperiodic structure arranged alternatingly by ZnS and MgF2 or GaAs and AlAs as the thickness of layers unchanged and the index of refraction changed or the index of refraction unchanged and the thickness of layers changed or the rate of index of refraction changed. The band gap structures were obtained and the application was discussed. Comparing to the optical crystals with periodic structure, the transmission spectra in one dimensional optical crystals with quasiperiods shifted and the band gap width changed.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 884 (2005)
Design of polarization splitters using two-dimensional photonic crystal
[in Chinese], and [in Chinese]
One kind of polarization splitter using two-dimensional photonic crystals is shown in this study. Both finite-difference time-domain simulations and equi-frequency contour plots in the first Brillouin zone are used to demonstrate how such a polarization splitter work. Basically, these phenomena are resulted from the diOne kind of polarization splitter using two-dimensional photonic crystals is shown in this study. Both finite-difference time-domain simulations and equi-frequency contour plots in the first Brillouin zone are used to demonstrate how such a polarization splitter work. Basically, these phenomena are resulted from the different dispersion properties of two-dimensional photonic crystals for TE and TM polarization. And thus such a structure can be employed as polarization splitters for integrated optical and microwave components.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 889 (2005)
Entropy squeezing of atom in Raman transition
[in Chinese], and [in Chinese]
The atomic entropy squeezing in Raman transition is studied by means of quantum information entropy theory. The influences of the initial parameters of the system on the atomic information entropy squeezing are presented. It is shown that the squeezed component number, depth and squeezed direction of the information enThe atomic entropy squeezing in Raman transition is studied by means of quantum information entropy theory. The influences of the initial parameters of the system on the atomic information entropy squeezing are presented. It is shown that the squeezed component number, depth and squeezed direction of the information entropy squeezing can be controlled by choosing atomic distribution angle, the relative phase between the two-mode field and the different of the average photon number of the two field modes, respectively. It is also shown that quantum information entropy is a remarkable precision measure for the atomic squeezing.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 894 (2005)
Quantum fluctuations of current in a mesoscopic lossless transmission line at finite temperature
[in Chinese], [in Chinese], and [in Chinese]
By making use of thermo-field dynamics （TFD）, the quantum fluctuations of current of the mesoscopic lossless transmission line in the vacuum state, the coherent states and the squeezed states with thermal noise have been studied. Thus the dependence of the fluctuations on temperature in these states at finite temperatuBy making use of thermo-field dynamics （TFD）, the quantum fluctuations of current of the mesoscopic lossless transmission line in the vacuum state, the coherent states and the squeezed states with thermal noise have been studied. Thus the dependence of the fluctuations on temperature in these states at finite temperature can be seen. It is shown that the quantum fluctuations depend on not onh- the parameters of the transmission line but also the environmental temperature T. The higher the temperature, the more quantum noise the line exhibits..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 900 (2005)
Thermosqueezing effect in a mesoscopic LC circuit at a finite temperature
[in Chinese], and [in Chinese]
The time evolution of a quantum state of mesoscopic LC circuit are studied in detail by using thermo-field dynamics （TFD） at a finite temperature. The result indicates that the quantum state of a mesoscopic LC circuit evolves from the thermal vacuum state to coherence state and go on by the action of an external impulsThe time evolution of a quantum state of mesoscopic LC circuit are studied in detail by using thermo-field dynamics （TFD） at a finite temperature. The result indicates that the quantum state of a mesoscopic LC circuit evolves from the thermal vacuum state to coherence state and go on by the action of an external impulse functional signal on the circuit;the thermal squeezing properties of charge and flux appear in the circuit under some conditions;and furthermore, the typical quantum squeezing effect may occur when certain conditions and particular temperature are meet..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 907 (2005)
Application of CPLD in time-of-flight measurement of self-triggering pulsed laser ranging
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
Self-triggering pulsed laser ranging, a novel pulsed laser ranging method, can solve the dilemma between ranging precision and measuring speed in the traditional laser ranging technique. The ranging precision and measuring speed are decided by the design of the time-of -flight measurement system to great extent. A timeSelf-triggering pulsed laser ranging, a novel pulsed laser ranging method, can solve the dilemma between ranging precision and measuring speed in the traditional laser ranging technique. The ranging precision and measuring speed are decided by the design of the time-of -flight measurement system to great extent. A time-of-flight measurement system based on CPLD for self-triggering pulsed laser ranging is designed and implemented. Benefiting from the high speed of CPLD, the precision of laser rangefinder is improved. Furthermore, the time-of-flight measurement system is adapted extraordinarily to high performance portable pulsed laser rangefinder for its compactness, simple structure, and high reliability. At last, experiment on self-triggering pulsed laser ranging is carried out, in which ±1 millimeter precision is achieved with 20 m-range area..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 914 (2005)
Analysis of laser altimeter echo energy attenuation in atmosphere transfer medium
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
Machanism of laser altimeter energy attenuation in atmosphere is analyzed, and using data of USA standard atmospheric mode middle latitude zone in fine and foggy days, slantwise transmissivities of 1.064μm and 0.86 μm relating to the obliquity of altimeter platform are presented. Qualitative analysis of echo signal widMachanism of laser altimeter energy attenuation in atmosphere is analyzed, and using data of USA standard atmospheric mode middle latitude zone in fine and foggy days, slantwise transmissivities of 1.064μm and 0.86 μm relating to the obliquity of altimeter platform are presented. Qualitative analysis of echo signal width extension from atmosphere transfer medium is given. These benefit the design and observation appication of laser altimeter..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 918 (2005)
Study of GaAs/Si/AlAs by DLTS technique
[in Chinese], [in Chinese], and [in Chinese]
GaAs/AlAs heterojunction has been widely used in practice for various devices. Band offsets at semiconductor heterojunctions are fundamental parameters which govern the transport properties to miroelectronic devices. Recent theoretical and experimental results have focused attention on the thin Si interlayers at GaAs/AGaAs/AlAs heterojunction has been widely used in practice for various devices. Band offsets at semiconductor heterojunctions are fundamental parameters which govern the transport properties to miroelectronic devices. Recent theoretical and experimental results have focused attention on the thin Si interlayers at GaAs/AlAs heterojunctions in determining heterojunction band discontinuities. Both the presence of Si interlayer and GaAs at different growth temperature probably bring crystal defect into GaAs/Si/AlAs, which lead to bad quality of GaAs/Si/AlAs heterojunctions and influence the technical applications of heterojunctions in practice. GaAs/Si/AlAs heterojunctions prepared by MBE are examined. The influence of 0.5 ML Si interlayer and GaAs at different growth temperature on GaAs/AlAs are investigated by DLTS technique. The results reveal that the Si interlayer has little influence on the crystal, whereas the lower growth temperature for GaAs is, the more deep level defects occur in the crystal.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 923 (2005)
Dynamical localization of an exciton in an asymmetric quantum dot molecule
[in Chinese], and [in Chinese]
The dynamical localization of an exciton in asymmetric double quantum dot molecule with an alternating-current field is studied. The phenomenon of localization of an excition in the quantum system is analyled with two-level system theory. It is found that the quasienergy have some avoided crossings. The numerical resulThe dynamical localization of an exciton in asymmetric double quantum dot molecule with an alternating-current field is studied. The phenomenon of localization of an excition in the quantum system is analyled with two-level system theory. It is found that the quasienergy have some avoided crossings. The numerical results demonstrate that dynamical localization still exists at avoided crossings in the system. Electrons and holes move between the two coupled dots as a hole even if the strength of the electric filed is much stronger than the Coulomb interaction. The dynamics of the exciton are mainly confined in the low-energy subspance, also, the formulation of the entangled state is given.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 927 (2005)
Temperature characteristics of Au/n-4H-SiC Schottky UV photodiode
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
With microelectronics plane technology, electron beam evaporation is used to deposit metal Au on the surface of n-4H-SiC to form Schottkv contact, alloys Ti, Ni, Ag used to form Ohmic contact on the n＋ backside, the Schottkv barrier ultraviolet photodiode has been fabricated. The spectrum response characteristics and tWith microelectronics plane technology, electron beam evaporation is used to deposit metal Au on the surface of n-4H-SiC to form Schottkv contact, alloys Ti, Ni, Ag used to form Ohmic contact on the n＋ backside, the Schottkv barrier ultraviolet photodiode has been fabricated. The spectrum response characteristics and the I-V characteristics of the devices have been measured and analyzed at different temperatures. The measurement results show that the device has lower leakage current at high temperatures. The descendent speed of the forward turn-on voltage is -1.2 mV/℃. The response wavelength range is from 200 nm to 400nm, the peak value of the spectrum response appears in 320 nm at 23 ℃ and 330 nm at 260 ℃ respectively, and the wavelength has red shift about 4 nm every 100 ℃;The sensitivity of response reduces as temperature rises, and it is reduced by 2 times every 100 ℃ on average.
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 932 (2005)
Analytical solution of the fundamental space filling mode of photonic crystal fibers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The fundamental space filling mode of photonic crystal fibers can be designated HE11 mode following conventional mode classification. A comparison is made between the vectorial method and the scalar method when identical parameters are used in the analytical solution of the fundamental space filling mode of photonic crThe fundamental space filling mode of photonic crystal fibers can be designated HE11 mode following conventional mode classification. A comparison is made between the vectorial method and the scalar method when identical parameters are used in the analytical solution of the fundamental space filling mode of photonic crystal fibers. A best radius of the equivalent circular unit cell is determined..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 935 (2005)
Population inversion ratio of the upper state for broad-band Erbium-doped tellurite-based fiber amplifier
[in Chinese], [in Chinese], and [in Chinese]
The theoretical studies of the upper state population inversion ratio for erbiumdoped tellurite-based fiber amplifier（EDTFA） are presented, and its distribution curves with the activated fiber length, each channel signal input power, bi-directional pumping power and erbium-doped concentration, respectively, are also obThe theoretical studies of the upper state population inversion ratio for erbiumdoped tellurite-based fiber amplifier（EDTFA） are presented, and its distribution curves with the activated fiber length, each channel signal input power, bi-directional pumping power and erbium-doped concentration, respectively, are also obtained. Investigations of the relations between the population inversion ratio and the signal gain of EDTFA are given. It is shown that the signal gain of EDTFA is determined by the upper state population inversion ratio..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 941 (2005)
Influence of the third-order dispersion on the propagation properties of Gaussian-shaped pulses in optical fibers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The evolution equations for the parameters of the optical Gaussian-shaped pulse in optical fibers are derived by means of variational method from the MNLS equation. Then three important restricted relations between amplitude and width, frequency and chirp, width and chirp are obtaimed. Analytical solution about the widThe evolution equations for the parameters of the optical Gaussian-shaped pulse in optical fibers are derived by means of variational method from the MNLS equation. Then three important restricted relations between amplitude and width, frequency and chirp, width and chirp are obtaimed. Analytical solution about the width of pulse evolving on the propagation distance is also obtained. The influence of the third-order dispersion on the propagation properties of optical gaussian-shaped pulses in optical fibers is discussed..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 946 (2005)
A novel fiber Bragg grating current sensor
[in Chinese], and [in Chinese]
A fiber Bragg grating current sensing configuration is introduced and experimented. High-current is conversed to low-voltage by Rogowski coil. Based on magnetostrictive effect of piezoelectric ceramic low-voltage is conversed into fiber Bragg grating wavelength shifts, which are conversed into phase shifts. Measuring tA fiber Bragg grating current sensing configuration is introduced and experimented. High-current is conversed to low-voltage by Rogowski coil. Based on magnetostrictive effect of piezoelectric ceramic low-voltage is conversed into fiber Bragg grating wavelength shifts, which are conversed into phase shifts. Measuring the phase shifts of the signal can demodulate the current. At the range from zero to 400 A, the sensing sensitivity of this scheme was demonstrated to be 0.0473 tad/A, experimentally. It basically matches the prospected value of 0.0589 rad/A..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 951 (2005)
A novel temperature sensor based on the cascaded long-period fiber gratings
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
A novel temperature sensor has been performed, which is based on the cascaded long-period fiber gratings. When only the temperature of the fiber between the LPGs is increased, the interferometric peaks will theoretically shift to longer wavelength and the loss will vary linearly. The temperature sensor is experimentallA novel temperature sensor has been performed, which is based on the cascaded long-period fiber gratings. When only the temperature of the fiber between the LPGs is increased, the interferometric peaks will theoretically shift to longer wavelength and the loss will vary linearly. The temperature sensor is experimentally realized based on the above theory, which has the sensitivity of 0.0353 nm/℃ and 0.0684 dB/℃, respectively. This kind of temperature sensor based on the cascaded LPGs will have wide application prospect..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 955 (2005)
Experiment and calculation of 532 nm laser scattering in the near ground atmosphere
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
We measured the angle scattering coefficient of near ground atmosphere to 532nm laser bv experiment. The angle scattering coefficient of aerosol were calculated using both the Junge or Deirmendjian distribution. The calculated curve is observably different to measured curve at the second peak. It means the density of lWe measured the angle scattering coefficient of near ground atmosphere to 532nm laser bv experiment. The angle scattering coefficient of aerosol were calculated using both the Junge or Deirmendjian distribution. The calculated curve is observably different to measured curve at the second peak. It means the density of large aerosol is bigger than Junge ＆ Deirmendjian mode..
Chinese Journal of Quantum Electronics
- Publication Date: Dec. 31, 2005
- Vol. 22, Issue 6, 960 (2005)
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