The threshold pump energies at 1.06 μm and Raman gain coefficients of stimulated Raman scattering (SRS) at 1.54 μm have been measured in both single-pass and half-resonator configurations at various methane pressures. In the single-pass configuration, the Raman gain coefficients of the backward and forward SRS are 0.32 and 0.23 cm/GW at 95 atm, respectively. The backward Raman gain coefficient is higher than the forward Raman gain coefficient. This gain reduction is caused by the depletion of local pump intensity, the phase-matching conditions, and the transient effect of the high amplification rate in the forward SRS process. In the half-resonator configuration, the Raman gain coefficient was 0.46 cm/GW at 75 atm of methane.
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机译：在单通和半共振器配置中，在各种甲烷压力下，都已测量了1.06μm的阈值泵浦能量和1.54μm的受激拉曼散射（SRS）的拉曼增益系数。在单通配置中，后向和前向SRS在95 atm处的拉曼增益系数分别为0.32和0.23 cm / GW。后向拉曼增益系数高于前向拉曼增益系数。这种增益降低是由于局部泵浦强度的耗尽，相位匹配条件以及正向SRS过程中高放大率的瞬态效应引起的。在半谐振器配置中，在75个大气压的甲烷下，拉曼增益系数为0.46 cm / GW。
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