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Ultrafast laser inscribed waveguide lasers in Tm:CALGO with depressed-index cladding.
Optics Express ( IF 3.2 ) Pub Date : 2020-02-03 , DOI: 10.1364/oe.384258
Victor Llamas , Pavel Loiko , Esrom Kifle , Carolina Romero , Javier R. Vázquez de Aldana , Zhongben Pan , Josep Maria Serres , Hualei Yuan , Xiaojun Dai , Huaqiang Cai , Yicheng Wang , Yongguang Zhao , Viktor Zakharov , Andrey Veniaminov , Romain Thouroude , Mathieu Laroche , Hervé Gilles , Magdalena Aguiló , Francesc Díaz , Uwe Griebner , Valentin Petrov , Patrice Camy , Xavier Mateos

Depressed-index buried and surface channel waveguides (type III) are produced in a bulk 3.5 at.% Tm3+:CALGO crystal by femtosecond direct-laser-writing at kHz repetition rate. The waveguides are characterized by confocal microscopy and µ-Raman spectroscopy. Under in-band-pumping at 1679 nm (3H6 → 3F4 transition) by a Raman fiber laser, the buried channel waveguide laser with a circular cladding (diameter: 60 µm) generated a continuous-wave output power of 0.81 W at 1866-1947 nm with a slope efficiency of 71.2% (versus the absorbed pump power) and showed a laser threshold of 200 mW. The waveguide propagation losses were as low as 0.3 ± 0.2 dB/cm. The laser performance under in-band pumping was superior compared pumping at ∼800 nm (3H6 → 3H4 transition), i.e., the convetional pump wavelength. Vibronic laser emission from the WG laser above 2 µm is also achieved. The low-loss behavior, the broadband emission properties and good power scaling capabilities indicate the suitability of Tm3+:CALGO waveguides for mode-locked laser operation at ∼2 µm.

中文翻译:

Tm:CALGO中的超快激光内接波导激光器,带有下折射率包层。

通过飞秒直接激光写入,以kHz重复频率,在体积为3.5 at。%的Tm3 +:CALGO晶体中生产了折射率降低的埋入式和表面沟道波导(III型)。波导的特征在于共聚焦显微镜和拉曼光谱。在拉曼光纤激光器在1679 nm的带内泵浦(3H6→3F4跃迁)下,带有圆形包层(直径:60 µm)的掩埋通道波导激光器在1866-1947年产生了0.81 W的连续波输出功率效率为71.2%(相对于吸收的泵浦功率)的光通量为100 nm,激光阈值为200 mW。波导传播损耗低至0.3±0.2 dB / cm。带内泵浦下的激光性能优于在〜800 nm(3H6→3H4跃迁)即对流泵浦波长下的泵浦性能。还可以实现WG激光器发出的2微米以上的振动激光。低损耗性能,宽带发射特性和良好的功率缩放能力表明Tm3 +:CALGO波导适用于约2 µm的锁模激光工作。
更新日期:2020-02-03
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