Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range
Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range
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DOI：
10.1109/jstqe.2014.2350022
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发表时间：
2015-01-01
影响因子：
4.9
通讯作者：
Mueller, Sebastian
中科院分区：
文献类型：
--
作者：
Calmano, Thomas;Mueller, Sebastian
本文综述了近年来利用飞秒激光刻字技术制备晶体波导和波导激光器的研究进展。以掺镱和钕的Y3Al5O12为基料，实现了在近红外光谱范围内发射的高效波导激光器，其斜率效率超过70%，连续波输出功率大于5W。此外，通过在单片装置中加入可饱和吸收剂Cr4+:YAG，实现了被动调q YAG和Nd:YAG波导激光器的脉冲激光工作。基于光纤激光器写入Yb: YAG的弯曲结构，可以证明高效的弯曲波导激光器。此外，还研究了可见光范围内的波导激光器。我们实现了在绿色、橙色、红色和深红色光谱区域的激光发射，并证明了基于镨掺杂材料的波导的输出功率超过1w。此外，实现了橙色和红色激光发射之间的切换和双波长操作。利用非线性晶体KTiOPO4作为光纤激光刻字的衬底材料，实现了非线性波导。利用这些装置，在蓝、绿光谱范围内实现了高效的二次谐波产生。
This paper summarizes our recent results on crystalline waveguides and waveguide lasers fabricated by the femtosecond-laser writing technique. Highly efficient waveguide lasers emitting in the near infrared spectral range based on ytterbium and neodymium doped Y3Al5O12 with slope efficiencies above 70% and continuous wave output powers of more than 5W were demonstrated. Furthermore, pulsed laser operation of passively Q-switched Yb:YAG and Nd:YAG wavequide lasers was achieved by incorporating the saturable absorber Cr4+:YAG in a monolithic setup. Based on fs-laser written curved structures in Yb: YAG, efficient curved waveguide lasers could be demonstrated. Also, waveguide lasers in the visible spectral range were investigated. We achieved laser emission in the green, orange, red and deep-red spectral region and could demonstrate output powers of more than 1 W with waveguides based on praseodymium doped materials. Additionally, switchable and dual wavelength operation between the orange and red laser emission was achieved. By utilizing the nonlinear crystal KTiOPO4 as substrate material for fs-laser inscription, nonlinear waveguides were realized. With these devices, efficient second harmonic generation into the blue and green spectral range was achieved.