Utilizing RTP crystal to generate fifth-order Stokes laser emission with 271 cm−1 Raman shift
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摘要: 报道了端面泵浦被动调Q激光驱动RbTiOPO4晶体拉曼实现271 cm−1频移高阶斯托克斯激光输出。采用Nd:YAG与Cr4+:YAG键合设计来降低腔内的损耗，并使激光系统更紧凑，从而提升腔内光子功率密度，有利于拉曼频移向高阶斯托克斯激光转换。设计不同频移的一阶斯托克斯激光对应在不同腔内振荡，利用与基频光模式匹配的差异来抑制687 cm−1频移的一阶斯托克斯激光，最终获得较纯的271 cm−1频移的五阶斯托克斯激光输出。在泵浦功率8.1 W下，获得了平均输出功率230 mW的1244 nm波长激光，对应的脉冲宽度和重复频率分别为2.9 ns和11.7 kHz。1 244 nm波段的激光正好与水中OH−1吸收峰对应，在地表植被和行星水含量的检测等领域有重要的应用。Abstract: The RbTiOPO4 crystal Raman emission at high-order Stokes with 271 cm−1 shift driven by an end-pumped passively Q-switched laser was demonstrated. The Nd:YAG and Cr4+:YAG bonding design was used to reduce the intracavity loss and make the laser system compact, so as to raise the intracavity photon density, which proved helpful for the conversion of Raman shift to high-order Stokes light. The first-Stokes laser with different Raman shifts is designed to oscillate in different cavities, and the first-Stokes laser with 687 cm−1 shift is suppressed by using the difference in cavity mode matching with the fundamental laser, and the fifth-order Stokes laser with 271 cm−1 shift is obtained. Under the pump power of 8.1 W, a 1 244 nm wavelength laser with an average output power of 230 mW was obtained, and the corresponding pulse width and pulse frequency repetition were 2.9 ns and 11.7 kHz, respectively. The 1 244 nm laser wavelength perfectly matched the OH−1 absorption peak in water, which could have significant applications in fields such as surface vegetation and planetary water detection.
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Key words:
- RTP crystal /
- Raman laser /
- passively Q-switched /
- fifth-order Stokes
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图 1 x轴切割RTP拉曼频移谱线图
Figure 1. Plot showing the nonpolarized Raman spectrum of x-cut RTP
图 2 被动调Q RTP拉曼激光实验装置图
Figure 2. Experimental setup of passively Q-switched RTP Raman laser
图 3 M1、M2和M3的透过率曲线
Figure 3. Transmittance of cavity mirror M1, M2 and M3 at different Stokes wavelengths
图 4 不同注入泵浦功率下的RTP拉曼激光光谱
Figure 4. Output laser spectra of RTP Raman at different incident pump power
图 5 拉曼激光输出功率随泵浦功率的变化关系
Figure 5. Average output power versus incident pump power for the Raman laser output
图 6 斯托克斯激光脉冲宽度和重复频率随泵浦功率的变化曲线图
Figure 6. The pulse width and pulse repetition frequency (PRF) of Stokes light versus incident pump power
图 7 在8.1 W泵浦功率下的斯托克斯激光的脉冲波形和脉冲序列
Figure 7. Temporal pulse profiles and pulse trains of Stokes light under an incident pump power of 8.1 W
表 1 M1、M2和M3对不同斯托克斯激光的透过率
Table 1. Transmittances of M1, M2 and M3 for the different Stokes wavelengths
wavelength/nm contributed Raman shifts transmittance/% M1 M2 M3 1064 / 0.06 98.51 0.03 1096 $ {\omega }_{\mathrm{R}2} $ 0.08 51.67 0.03 1130 $ {2\omega }_{\mathrm{R}2} $ 0.44 0.52 0.05 1149 $ {\omega }_{\mathrm{R}3} $ 1.75 0.15 0.03 1165 $ {3\omega }_{\mathrm{R}2} $ 8.13 0.09 0.03 1185 $ {\omega }_{\mathrm{R}2}+{\omega }_{\mathrm{R}3} $ 82.06 0.02 0.08 1204 $ 4{\omega }_{\mathrm{R}2} $ 48.36 0.03 1.14 1216 $ {\omega }_{\mathrm{R}1}+{\omega }_{\mathrm{R}2}+{\omega }_{\mathrm{R}3} $ 44.57 0.02 5.74 1225 $ 2{\omega }_{\mathrm{R}2}+{\omega }_{\mathrm{R}3} $ 50.93 0.03 33.02 1244 $ 5{\omega }_{\mathrm{R}2} $ 81.18 0.04 40.66 1246 $ 2{\omega }_{\mathrm{R}3} $ 83.84 0.13 40.37 note: $ {\omega }_{\mathrm{R}1}=213\;\mathrm{c}{\mathrm{m}}^{-1},\;{\omega }_{\mathrm{R}2}=271\;\mathrm{c}{\mathrm{m}}^{-1} $, $ \omega_{\mathrm{R}3}=687\; \mathrm{c}\mathrm{m}^{-1}。 $ 
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