Jun Meng, Chen Li, Zhenhua Cong, Zhigang Zhao, Shang Wang, Gaoyou Liu, Zhaojun Liu. Beam quality improvement of the high-energy KTA-OPO based on a confocal unstable cavity with Gaussian reflectivity mirror[J]. Chinese Optics Letters, 2023, 21(5): 051401
- Chinese Optics Letters
- Vol. 21, Issue 5, 051401 (2023)
Fig. 1. Schematic diagram of KTA-based OPO. ISO, isolator; HWP, half-wave plate; M1, mirror 1; GRM, Gaussian-reflectivity mirror; M2, 45° beam splitter.
Fig. 2. (a) Threshold and maximum output energy versus magnification factors; (b) output energies (signal + idler) with different magnification factors (m) versus input energy.
Fig. 3. The M2 factors versus magnification factor (m). (a) Numerical simulation; (b) experimental results.
Fig. 4. The M2 factors of signal and idler with magnification factor (m) of 1.5. (a) M2 factors of signal; (b) M2 factors of idler; insets show the beam profiles of signal and idler.
Fig. 5. Spectrum with 0.02-nm resolution. (a) Spectrum of pump light; (b) signal spectrum of OPO.
Fig. 6. (a) Pulse duration of signal; (b) pulse duration of idler.
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Table 1. Summary of M 2 and Brightness (B ) with Different Magnification Factors (m )
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