High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

Y. F. Chen; C. C. Chang; C. Y. Lee; C. L. Sung; J. C. Tung; K. W. Su; H. C. Liang; W. D. Chen; G. Zhang

doi:10.1364/PRJ.5.000561

Journals >Photonics Research >Volume 5 >Issue 6 >Page 561 > Article

Photonics Research
Vol. 5, Issue 6, 561 (2017)

High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

Y. F. Chen^1、*, C. C. Chang¹, C. Y. Lee¹, C. L. Sung¹, J. C. Tung¹, K. W. Su¹, H. C. Liang², W. D. Chen³, and G. Zhang³

Author Affiliations

¹Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan

²Institute of Optoelectronic Science, National Taiwan Ocean University, Keelung 20224, Taiwan

³Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China

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DOI: 10.1364/PRJ.5.000561 Cite this Article Set citation alerts

Y. F. Chen, C. C. Chang, C. Y. Lee, C. L. Sung, J. C. Tung, K. W. Su, H. C. Liang, W. D. Chen, G. Zhang, "High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation," Photonics Res. 5, 561 (2017) Copy Citation Text

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Configuration of the concave-flat cavity for implementing the off-axis pumped Nd:YVO4/Cr4+:YAG passively Q-switched lasers in a degenerate resonator.

Fig. 1. Configuration of the concave-flat cavity for implementing the off-axis pumped Nd:YVO4/Cr4+:YAG passively Q-switched lasers in a degenerate resonator.

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Wave patterns |ΨmoM(x,y,z;ϕo)| inside the cavity for the cases of (a) ϕo=0 and (b) ϕo=π/10 with mo=30 and M=5. Right-hand side: transverse patterns of the emitted beams at z=2L.

Fig. 2. Wave patterns |ΨmoM(x,y,z;ϕo)| inside the cavity for the cases of (a) ϕo=0 and (b) ϕo=π/10 with mo=30 and M=5. Right-hand side: transverse patterns of the emitted beams at z=2L.

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Fig. 3. Numerical results for the wave patterns |Ψ˜moM(+)(r,ϕ,z;ϕo)| with a fixed M=2 for three cases of mo=5, 10, and 15. Second row: numerical results for the phase structures.

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Fig. 4. (a) Average output power versus incident pump power for lasing modes excited at Δy=0.48, 0.55, and 0.97 mm. (b) Dependence of the lasing mode on the pump power.

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Fig. 5. (a) Pulse repetition rate versus incident pump power for lasing modes shown in Fig. 4(a). (b) A typical oscilloscope trace.

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Fig. 6. Experimental results (first row), numerical calculations (second row), and numerical phase structures (third row) for the patterns of the converted beams at z=2L for the lasing modes shown in Fig. 4(b) at a pump power of 3.8 W.

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