Contents
2015
Volume: 3 Issue 3
15 Article(s)
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PHOTONICS BASED on TWO DIMENSIONAL MATERIALS
Nonlinear optical absorption of few-layer molybdenum diselenide (MoSe2) for passively mode-locked soliton fiber laser [Invited]
Zhengqian Luo, Yingyue Li, Min Zhong, Yizhong Huang, Xiaojiao Wan, Jian Peng, and Jian Weng
In this paper, both nonlinear saturable absorption and two-photon absorption (TPA) of few-layer molybdenum diselenide (MoSe2) were observed at 1.56 μm wavelength and further applied to mode-locked ultrafast fiber laser for the first time to our knowledge. Few-layer MoSe2 nanosheets were prepared by liquid-phase exfoliaIn this paper, both nonlinear saturable absorption and two-photon absorption (TPA) of few-layer molybdenum diselenide (MoSe2) were observed at 1.56 μm wavelength and further applied to mode-locked ultrafast fiber laser for the first time to our knowledge. Few-layer MoSe2 nanosheets were prepared by liquid-phase exfoliation method and characterized by x ray diffractometer, Raman spectroscopy, and atomic force microscopy. The obtained few-layer MoSe2 dispersion is further composited with a polymer material for convenient fabrication of MoSe2 thin films. Then, we investigated the nonlinear optical (NLO) absorption property of the few-layer MoSe2 film using a balanced twin-detector measurement technique. Both the saturable absorption and TPA effects of the few-layer MoSe2 film were found by increasing the input optical intensity. The saturable absorption shows a modulation depth of 0.63% and a low nonsaturable loss of ～ 3.5 % ～ 260 MW / cm 2
Photonics Research
- Publication Date: Apr. 20, 2015
- Vol. 3, Issue 3, A79 (2015)
Flexible, robust and highly efficient broadband nonlinear optical materials based on graphene oxide impregnated polymer sheets
Xiao-Fang Jiang, Lakshminarayana Polavarapu, Hai Zhu, Rizhao Ma, and Qing-Hua Xu
We report a simple solution-processed method for the fabrication of low-cost, flexible optical limiting materials based on graphene oxide (GO) impregnated polyvinyl alcohol (PVA) sheets. Such GO–PVA composite sheets display highly efficient broadband optical limiting activities for femtosecond laser pulses at 400, 800,We report a simple solution-processed method for the fabrication of low-cost, flexible optical limiting materials based on graphene oxide (GO) impregnated polyvinyl alcohol (PVA) sheets. Such GO–PVA composite sheets display highly efficient broadband optical limiting activities for femtosecond laser pulses at 400, 800, and 1400 nm with very low limiting thresholds. Femtosecond pump–probe measurement results revealed that nonlinear absorption played an important role for the observed optical limiting activities. High flexibility and efficient optical limiting activities of these materials allow these composite sheets to be attached to nonplanar optical sensors in order to protect them from light-induced damage..
Photonics Research
- Publication Date: Apr. 22, 2015
- Vol. 3, Issue 3, A87 (2015)
Few-layer MoS2 grown by chemical vapor deposition as a passive Q-switcher for tunable erbium-doped fiber lasers
Handing Xia, Heping Li, Changyong Lan, Chun Li, Jinbo Du, Shangjian Zhang, and Yong Liu
We report an erbium-doped fiber laser passively Q-switched by a few-layer molybdenum disulfide (MoS2) saturable absorber (SA). The few-layer MoS2 is grown by the chemical vapor deposition method and transferred onto the end-face of a fiber connector to form a fiber-compatible MoS2 SA. The laser cavity is constructed byWe report an erbium-doped fiber laser passively Q-switched by a few-layer molybdenum disulfide (MoS 2 MoS 2 MoS 2 MoS 2
Photonics Research
- Publication Date: Apr. 30, 2015
- Vol. 3, Issue 3, A92 (2015)
Passively Q -switched tri-wavelength Yb3+:GdAl3(BO3)4 solid-state laser with topological insulator Bi2Te3 as saturable absorber
Yi-Jian Sun, Chao-Kuei Lee, Jin-Long Xu, Zhao-Jie Zhu, Ye-Qing Wang, Shu-Fang Gao, Hou-Ping Xia, Zhen-Yu You, and Chao-Yang Tu
In this paper, we reported a multiwavelength passively Q-switched Yb3+:GdAl3(BO3)4 solid-state laser with topological insulator Bi2Te3 as a saturable absorber (SA) for the first time, to the best of our knowledge. Bi2Te3 nanosheets were prepared by the facile solvothermal method. The influence of three Bi2Te3 densitiesIn this paper, we reported a multiwavelength passively Q Yb 3 + : GdAl 3 ( BO 3 ) 4 Bi 2 Te 3 Bi 2 Te 3 Bi 2 Te 3 Bi 2 Te 3
Photonics Research
- Publication Date: May. 15, 2015
- Vol. 3, Issue 3, A97 (2015)
Ethanol catalytic deposition of MoS2 on tapered fiber
Hao Wang, Bohua Chen, Xiaoyan Zhang, Sheng Liu, Bangqi Zhu, Jun Wang, Kan Wu, and Jianping Chen
Deposition of two-dimensional (2D) MoS2 materials on the tapered fiber allows various photonic applications including saturable absorbers and four-wave mixing. Ethanol catalytic deposition (ECD) of MoS2 on the optical tapered fiber was proposed and demonstrated in this work. Different from the conventional optical drivDeposition of two-dimensional (2D) MoS2 materials on the tapered fiber allows various photonic applications including saturable absorbers and four-wave mixing. Ethanol catalytic deposition (ECD) of MoS2 on the optical tapered fiber was proposed and demonstrated in this work. Different from the conventional optical driven deposition using water or organic solvent, the ECD method utilized the high volatility of the ethanol solvent, which significantly increased the movement speed of the MoS2 nanosheets and thus boosted the deposition rate and reduced the minimum power threshold to drive the deposition. We believe the ECD method should be able to be applied to other similar 2D materials such as other types of transition metal chalcogenides..
Photonics Research
- Publication Date: Jun. 01, 2015
- Vol. 3, Issue 3, A102 (2015)
Fiber Optic Amplifiers
1.3 kW monolithic linearly polarized single-mode master oscillator power amplifier and strategies for mitigating mode instabilities
Rumao Tao, Pengfei Ma, Xiaolin Wang, Pu Zhou, and Zejin Liu
We report on the high-power amplification of a 1064 nm linearly polarized laser in an all-fiber polarization-maintained master oscillator power amplifier, which can operate at an output power level of 1.3 kW. The beam quality (M2) was measured to be <1.2 at full power operation. The polarization extinction rate of tWe report on the high-power amplification of a 1064 nm linearly polarized laser in an all-fiber polarization-maintained master oscillator power amplifier, which can operate at an output power level of 1.3 kW. The beam quality (M 2 < 1.2
Photonics Research
- Publication Date: Apr. 17, 2015
- Vol. 3, Issue 3, 86 (2015)
Metamaterials
Ultra-thin, planar, broadband, dual-polarity plasmonic metalens
Wei Wang, Zhongyi Guo, Rongzhen Li, Jingran Zhang, Yi Liu, Xinshun Wang, and Shiliang Qu
An ultrathin, planar, broadband metalens composed of metal rectangular split-ring resonators (MRSRRs) has been designed, which shows dual-polarity characteristics for different types of circularly polarized (CP) light incidence. The designed metalens can be considered as the focusing lens and the diverging lens under lAn ultrathin, planar, broadband metalens composed of metal rectangular split-ring resonators (MRSRRs) has been designed, which shows dual-polarity characteristics for different types of circularly polarized (CP) light incidence. The designed metalens can be considered as the focusing lens and the diverging lens under left-handed CP and right-handed CP light incidence, respectively. The phase discontinuity of the cross-polarized transmission light is produced by optical-axis rotation through modulating two arms’ lengths of the MRSRR. The MRSRR metalens possesses a wavelength-controllable focal length and a relatively larger chromatic aberration compared with the conventional lenses. And the focal length changes from 9 to 7 μm with incident wavelength from 740 to 950 nm. The dual-polarity flat metalens opens a door for new applications of phase discontinuity devices, and it will promote the fabricating capability of on-chip or fiber-embedded optical devices..
Photonics Research
- Publication Date: Apr. 09, 2015
- Vol. 3, Issue 3, 68 (2015)
Mode-Locked Lasers
Soliton mode-locked fiber laser based on topological insulator Bi2Te3 nanosheets at 2 μm
Ke Yin, Bin Zhang, Lei Li, Tian Jiang, Xuanfeng Zhou, and Jing Hou
We reported diverse soliton operations in a thulium/holmium-doped fiber laser by taking advantage of a tapered fiber-based topological insulator (TI) Bi2Te3 saturable absorber (SA). The SA had a nonsaturable loss of ～53.5% and a modulation depth of 9.8%. Stable fundamentally mode-locked solitons at 1909.5 nm with distiWe reported diverse soliton operations in a thulium/holmium-doped fiber laser by taking advantage of a tapered fiber-based topological insulator (TI) Bi 2 Te 3 ～ 53.5 %
Photonics Research
- Publication Date: Apr. 09, 2015
- Vol. 3, Issue 3, 72 (2015)
Dual-wavelength rectangular pulse erbium-doped fiber laser based on topological insulator saturable absorber
Bo Guo, Yong Yao, Yan-Fu Yang, Yi-Jun Yuan, Lei Jin, Bo Yan, and Jian-Yu Zhang
We reported on the generation of the dual-wavelength rectangular pulse in an erbium-doped fiber laser (EDFL) with a topological insulator saturable absorber. The rectangular pulse could be stably initiated with pulse width from 13.62 to 25.16 ns and fundamental repetition rate of 3.54 MHz by properly adjusting the pumpWe reported on the generation of the dual-wavelength rectangular pulse in an erbium-doped fiber laser (EDFL) with a topological insulator saturable absorber. The rectangular pulse could be stably initiated with pulse width from 13.62 to 25.16 ns and fundamental repetition rate of 3.54 MHz by properly adjusting the pump power and the polarization state. In addition, we verified that the pulse shape of the dual-wavelength rectangular pulse can be affected by the total net cavity dispersion in the fiber laser. Furthermore, by properly rotating the polarization controllers, the harmonic mode-locking operation of the dual-wavelength rectangular pulse was also obtained. The dual-wavelength rectangular pulse EDFL would benefit some potential applications, such as spectroscopy, biomedicine, and sensing research..
Photonics Research
- Publication Date: Apr. 17, 2015
- Vol. 3, Issue 3, 94 (2015)
Nonlinear Optics
Conversion of out-of-phase to in-phase order in coupled laser arrays with second harmonics
Chene Tradonsky, Micha Nixon, Eitan Ronen, Vishwa Pal, Ronen Chriki, Asher A. Friesem, and Nir Davidson
A novel method for converting an array of out-of-phase lasers into one of in-phase lasers that can be tightly focused is presented. The method exploits second-harmonic generation and can be adapted for different laser arrays geometries. Experimental and calculated results, presented for negatively coupled lasers formedA novel method for converting an array of out-of-phase lasers into one of in-phase lasers that can be tightly focused is presented. The method exploits second-harmonic generation and can be adapted for different laser arrays geometries. Experimental and calculated results, presented for negatively coupled lasers formed in a square, honeycomb, and triangular geometries are in good agreement..
Photonics Research
- Publication Date: Apr. 10, 2015
- Vol. 3, Issue 3, 77 (2015)
Optical Communications
SIMO detection schemes for underwater optical wireless communication under turbulence
Weihao Liu, Zhengyuan Xu, and Liuqing Yang
In underwater optical wireless communication (UOWC), a channel is characterized by abundant scattering/absorption effects and optical turbulence. Most previous studies on UOWC have been limited to scattering/absorption effects. However, experiments in the literature indicate that underwater optical turbulence (UOT) canIn underwater optical wireless communication (UOWC), a channel is characterized by abundant scattering/absorption effects and optical turbulence. Most previous studies on UOWC have been limited to scattering/absorption effects. However, experiments in the literature indicate that underwater optical turbulence (UOT) can cause severe degradation of UOWC performance. In this paper, we characterize an UOWC channel with both scattering/absorption and UOT taken into consideration, and a spatial diversity receiver scheme, say a single-input–multiple-output (SIMO) scheme, based on a light-emitting-diode (LED) source and multiple detectors is proposed to mitigate deep fading. The Monte Carlo based statistical simulation method is introduced to evaluate the bit-error-rate performance of the system. It is shown that spatial diversity can effectively reduce channel fading and remarkably extend communication range..
Photonics Research
- Publication Date: Apr. 06, 2015
- Vol. 3, Issue 3, 48 (2015)
Plasmonics
Tunable near-infrared plasmonic perfect absorber based on phase-change materials
Yiguo Chen, Xiong Li, Xiangang Luo, Stefan A. Maier, and Minghui Hong
A tunable plasmonic perfect absorber with a tuning range of ～650 nm is realized by introducing a 20 nm thick phase-change material Ge2Sb2Te5 layer into the metal–dielectric–metal configuration. The absorption at the plasmonic resonance is kept above 0.96 across the whole tuning range. In this work we study this extraorA tunable plasmonic perfect absorber with a tuning range of ～ 650 nm Ge 2 Sb 2 Te 5
Photonics Research
- Publication Date: Apr. 06, 2015
- Vol. 3, Issue 3, 54 (2015)
Quantum Optics
Interference of quantum beats in Hong–Ou–Mandel interferometry
Jing Qiu, Jun-Heng Shi, Yong-Sheng Zhang, Shen-Sheng Han, and You-Zhen Gui
Quantum beats can be produced in fourth-order interference such as in a Hong–Ou–Mandel (HOM) interferometer by using photons with different frequencies. Here we present theoretically the appearance of interference of quantum beats when the HOM interferometer is combined with a Franson-type interferometer. This combinatQuantum beats can be produced in fourth-order interference such as in a Hong–Ou–Mandel (HOM) interferometer by using photons with different frequencies. Here we present theoretically the appearance of interference of quantum beats when the HOM interferometer is combined with a Franson-type interferometer. This combination can make the interference effect of photons with different colors take place not only within the coherence time of downconverted fields but also in the region beyond that. We expect that it can provide a new method in quantum metrology, as it can realize the measurement of time intervals in three scales..
Photonics Research
- Publication Date: Apr. 10, 2015
- Vol. 3, Issue 3, 82 (2015)
Resonators
High-Q ring resonators directly written in As2S3 chalcogenide glass films
Shahar Levy, Matvei Klebanov, and Avi Zadok
Planar ring resonator waveguides are fabricated in thin films of As2S3 chalcogenide glass, deposited on silica-on-silicon substrates. Waveguide cores are directly written by scanning the focused illumination of a femtosecond Ti:sapphire laser at a central wavelength of 810 nm, through a two-photon photo-darkening procePlanar ring resonator waveguides are fabricated in thin films of As 2 S 3 Q Q
Photonics Research
- Publication Date: Apr. 06, 2015
- Vol. 3, Issue 3, 63 (2015)
Silicon Photonics
Silicon high-speed binary phase-shift keying modulator with a single-drive push–pull high-speed traveling wave electrode
Jinting Wang, Linjie Zhou, Haike Zhu, Rui Yang, Yanyang Zhou, Lei Liu, Tao Wang, and Jianping Chen
We demonstrate binary phase shift keying (BPSK) modulation using a silicon Mach–Zehnder modulator with a π-phase-shift voltage (Vπ) of 4.5 V. The single-drive push–pull traveling wave electrode has been optimized using numerical simulations with a 3 dB electro-optic bandwidth of 35 GHz. The 32 Gb/s BPSK constellation dWe demonstrate binary phase shift keying (BPSK) modulation using a silicon Mach–Zehnder modulator with a π V π 4.5 V
Photonics Research
- Publication Date: Apr. 06, 2015
- Vol. 3, Issue 3, 58 (2015)
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