In this paper, we demonstrate an ultrafast diamond Raman laser at 1240 nm with a pulse repetition rate of 956.62 MHz, a pulse duration of 39.5 ps, and an average power of up to 3.3 W based on synchronous pumping. The pump source is an electrical-pulse-modulated picosecond pulsed laser at 1064 nm with a repetition rate of 239.16 MHz and a pulse duration of 65.4 ps. A quadrupling repetition rate of the Raman pulse is achieved by synchronously amplifying both the forward and backward Raman pulses and the amplified Raman pulse undergoing two round trips in the resonator within one pump pulse period. The compression ratio of the pulse duration from the pump to the Raman is 1.66. This work offers a convenient and efficient method to significantly enhance the repetition rate of ultrafast crystalline Raman lasers and proves that a non-coherent ultrafast pump pulsed laser can be converted to a coherent mode-locked ultrafast Raman pulsed laser based on Raman conversion.

中文翻译：

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基于双向增益的GHz级重复频率同步泵浦金刚石拉曼激光器


在本文中，我们展示了一种基于同步泵浦的 1240 nm 超快金刚石拉曼激光器，脉冲重复率为 956.62 MHz，脉冲持续时间为 39.5 ps，平均功率高达 3.3 W。泵浦源是 1064 nm 的电脉冲调制皮秒脉冲激光器，重复率为 239.16 MHz，脉冲持续时间为 65.4 ps。通过同步放大正向和反向拉曼脉冲以及放大的拉曼脉冲在一个泵浦脉冲周期内在谐振器中经历两次往返，可以实现拉曼脉冲的四倍重复率。从泵浦到拉曼的脉冲持续时间的压缩比为1.66。这项工作提供了一种便捷有效的方法来显着提高超快晶体拉曼激光器的重复率，并证明非相干超快泵浦脉冲激光器可以基于拉曼转换转换为相干锁模超快拉曼脉冲激光器。