Morimoto Ryohei, Goto Taichi, Taira Takunori, Pritchard John, Mina Mani, Takagi Hiroyuki, Nakamura Yuichi, Lim Pang Boey, Uchida Hironaga, Inoue Mitsuteru
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi, Aichi, 441-8580, Japan.
JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
Sci Rep. 2017 Nov 13;7(1):15398. doi: 10.1038/s41598-017-15826-3.
Diode-pumped solid-state micro lasers are compact (centimetre-scale), highly stable, and efficient. Previously, we reported Q-switched lasers incorporating rare-earth substituted iron garnet (RIG) film. Here, the first demonstration of the magnetooptical (MO) Q-switch in an Nd:YAG laser cavity is performed. We fabricate a quasi-continuous-wave (QCW) diode-pumped Nd:YAG laser cavity, which is shortened to 10 mm in length and which contains an RIG film and a pair of small coils. This cavity yields a 1,064.58-nm-wavelength pulse with 25-ns duration and 1.1-kW peak power at a 1-kHz repetition ratio. Further, the polarisation state is random, due to the isotropic crystal structure of Nd:YAG and the fact that the MO Q-switch incorporating the RIG film does not require the presence of polarisers in the cavity. This is also the first report of an MO Q-switch producing random polarisation.
二极管泵浦固态微型激光器体积小巧（厘米级）、高度稳定且效率高。此前，我们报道了包含稀土取代铁石榴石（RIG）薄膜的调Q激光器。在此，首次在Nd:YAG激光腔中演示了磁光（MO）调Q。我们制造了一个准连续波（QCW）二极管泵浦Nd:YAG激光腔，其长度缩短至10毫米，包含一个RIG薄膜和一对小线圈。该腔在1千赫兹重复频率下产生波长为1064.58纳米、持续时间为25纳秒、峰值功率为1.1千瓦的脉冲。此外，由于Nd:YAG的各向同性晶体结构以及包含RIG薄膜的MO调Q在腔内不需要偏振器，偏振态是随机的。这也是关于产生随机偏振的MO调Q的首次报道。
