Theoretical analysis of periodically poled LiNbO<sub>3</sub> nonlinear mirror and its application in a passively mode-locked Nd:YSAG laser

Lina Zhao; Fangxin Cai; Luyang Tong; Ye Yuan; Wenyu Zhang; Yangjian Cai

doi:10.3788/COL202119.091403

Chinese Optics Letters, Volume. 19, Issue 9, 091403(2021)

Theoretical analysis of periodically poled LiNbO₃ nonlinear mirror and its application in a passively mode-locked Nd:YSAG laser

Lina Zhao^1,2、*, Fangxin Cai¹, Luyang Tong¹, Ye Yuan¹, Wenyu Zhang¹, and Yangjian Cai^1,2、**

Author Affiliations

¹College of Physics and Electronics, Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250014, China

²Shandong Provincial Key Laboratory of Optics and Photonic Device, Jinan 250014, China

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Figures & Tables(8)

Fig. 1. (a) Diagram of nonlinear mirror. (b) Nonlinear reflectivity dependence on intracavity peak intensity.

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Fig. 2. Diagram of mode-locked Nd:YSAG laser (M1, flat mirror; M2, M3, plane-concave mirror; M4, output coupler; B, Brewster polarization plate; dotted rectangle is nonlinear mirror).

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Fig. 3. Average output power dependence on pump power in the CW and CWML regime.

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Fig. 4. (a) Mode-locked pulse sequence at 100 ns time scale. (b) Mode-locked pulse sequence at 500 µs time scale.

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Fig. 5. Radio frequency waveform of CWML laser.

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Fig. 6. Optical spectrum of mode-locked Nd:YSAG laser.

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Fig. 7. Second harmonic efficiency at different wavelengths.

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Table 1. Modulation Depth, Saturable Intensity, and Nonsaturable Loss Dependence on Effective Nonlinear Coefficient
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Table 1. Modulation Depth, Saturable Intensity, and Nonsaturable Loss Dependence on Effective Nonlinear Coefficient
$d_{eff} (pm/V)$ $Δ D$ $I_{sat} ({G W/cm}^{2})$ $α_{ns}$
14 8.8% 0.091 0.3%
5 8.7% 0.113 0.4%
1 7.6% 1.800 1.5%

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Lina Zhao, Fangxin Cai, Luyang Tong, Ye Yuan, Wenyu Zhang, Yangjian Cai, "Theoretical analysis of periodically poled LiNbO₃ nonlinear mirror and its application in a passively mode-locked Nd:YSAG laser," Chin.Opt.Lett. 19, 091403 (2021)

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