Sub-50 ps pulses at 620 nm obtained from frequency doubled 1240 nm diamond Raman laser.
Sub-50 ps pulses at 620 nm obtained from frequency doubled 1240 nm diamond Raman laser.
复制标题
从倍频 1240 nm 金刚石拉曼激光器获得 620 nm 的亚 50 ps 脉冲。
作者：
J. Nikkinen;A. Härkönen;M. Guina
报道了一台单片式1240 nm金刚石喇曼激光器，其脉冲宽度为42-62ps，重复频率为100 kHz，最大平均功率为246 mW。拉曼激光器是由一块0.5 mm厚的平面金刚石形成的，它的两侧涂覆着一层金刚石，从1064 nm调Q激光输出的~100ps脉冲泵浦。从1064 nm到1240 nm的最大转换效率约为25%。1240 nm信号通过10 mm长的LBO晶体以单程配置倍频，从而能够产生持续时间为29-46ps的620 nm脉冲。在620 nm处的最大平均功率为128 mW，从1240 nm到620 nm的最大转换效率为50%。拉曼激光器提供了一种有效和灵活的方式，将短脉冲操作扩展到难以到达的光谱域中的波长，例如620 nm，此外还提供了简单的脉冲缩短机制。
We report a monolithic 1240 nm diamond Raman laser producing pulses with duration of 42-62 ps at 100 kHz repetition rate, and maximum average power of 246 mW. The Raman laser is formed by a 0.5-mm thick planar diamond, coated on both sides and pumped by ~100 ps pulses from a Q-switched 1064 nm laser. The maximum conversion efficiency from 1064 nm to 1240 nm was about 25%. The 1240 nm signal was frequency-doubled in single-pass configuration through a 10-mm long LBO crystal, enabling generation of pulses with a duration of 29-46 ps at 620 nm. The maximum average power at 620 nm was 128 mW, and the maximum conversion efficiency from 1240 nm to 620 nm was 50%. The Raman laser provides an efficient and flexible way to extend short pulse operation to wavelengths in spectral domains difficult to reach, such as 620 nm and in addition provides a simple pulse shortening mechanisms.