Ma Houjie, Wei Xin, Zhao Hui, Zhang Minglong, Zhou Haiqiong, Zhu Siqi, Yin Hao, Li Zhen, Chen Zhenqiang, Shen Yu, Zong Nan, Zhang Shenjin, Dai Shibo
Opt Lett. 2022 May 1;47(9):2210-2213. doi: 10.1364/OL.458424.
We demonstrate the first nanosecond pulsed single longitudinal mode (SLM) intracavity-pumped diamond Raman laser, to the best of our knowledge. The eye-safe coherent source at 1634 nm, which was converted from the actively Q-switched 1342 nm Nd:YVO laser, yielded 4.35 W of multimode average output power with a pulse duration of 6 ns and peak power of 29 kW. By exploiting the spatial hole burning free gain mechanism in the Raman media, stable SLM operation was observed at low output power (0.46 W) for the free-running case. Furthermore, by incorporating an etalon in the fundamental standing-wave cavity, the spectral linewidth of the fundamental field was suppressed substantially below the diamond Raman gain linewidth and slightly less than the free spectral range of the mm-scale Raman resonator. Thereby, a much higher SLM output power of 1.63 W was obtained with a pulse duration of ∼9 ns and a spectral linewidth of ∼77 MHz.
据我们所知，我们展示了首个纳秒脉冲单纵模（SLM）腔内泵浦金刚石拉曼激光器。这个1634 nm的人眼安全相干光源由主动调Q的1342 nm Nd:YVO激光器转换而来，产生了4.35 W的多模平均输出功率，脉冲持续时间为6 ns，峰值功率为29 kW。通过利用拉曼介质中无空间烧孔增益机制，在自由运转情况下，低输出功率（0.46 W）时观察到了稳定的单纵模运转。此外，通过在基波驻波腔中加入一个标准具，基波光场的谱线宽度被大幅抑制到低于金刚石拉曼增益线宽，且略小于毫米级拉曼谐振器的自由光谱范围。由此，获得了更高的1.63 W单纵模输出功率，脉冲持续时间约为9 ns，谱线宽度约为77 MHz。
