Efficient Raman frequency conversion of high‐power fiber lasers in diamond
Efficient Raman frequency conversion of high‐power fiber lasers in diamond
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DOI：
10.1002/lpor.201500032
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发表时间：
2015-07
影响因子：
11
通讯作者：
Robert J. Williams;J. Nold;M. Strecker;O. Kitzler;A. Mckay;T. Schreiber;R. Mildren
中科院分区：
文献类型：
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作者：
Robert J. Williams;J. Nold;M. Strecker;O. Kitzler;A. Mckay;T. Schreiber;R. Mildren
我们报告了使用双通泵浦外腔金刚石拉曼振荡器对掺镱光纤激光器进行高功率频率转换。圆偏振泵浦被证明是有效的，同时促进泵浦和拉曼激光器之间的高功率光学隔离。受光纤激光器中后向放大光的限制，我们实现了 154 W 的连续波平均功率和 50.5% 的转换效率。为了证明进一步的可扩展性，我们使用 10 ms 泵浦脉冲实现了 381 W 的最大稳态拉曼位移输出、61% 的转换效率和出色的光束质量，大约比瞬态热时间常数长一千倍。没有观察到功率饱和或光束质量下降。这些结果挑战了目前对拉曼晶体热沉积的理解，并预示着金刚石热效应比最初预期减少的前景。我们还报告了钻石中受激布里渊散射的第一个实验证据。
We report high‐power frequency conversion of a Yb‐doped fiber laser using a double‐pass pumped external‐cavity diamond Raman oscillator. Pumping with circular polarization is shown to be efficient while facilitating high‐power optical isolation between the pump and Raman laser. We achieved continuous‐wave average power of 154 W with a conversion efficiency of 50.5% limited by backward‐amplified light in the fiber laser. In order to prove further scalability, we achieved a maximum steady‐state Raman‐shifted output of 381 W with 61% conversion efficiency and excellent beam quality using 10 ms pump pulses, approximately a thousand times longer than the transient thermal time‐constant. No power saturation or degradation in beam quality is observed. The results challenge the present understanding of heat deposition in Raman crystals and foreshadow prospects for reduced thermal effects in diamond than originally anticipated. We also report the first experimental evidence for stimulated Brillouin scattering in diamond.