研究目的
Investigating the application of a transversally chirped volume Bragg grating (TC-VBG) in a Tm:YAP laser for tunable narrowband emission at 2 μm, aimed at enhancing remote gas sensing capabilities.
研究成果
The study successfully demonstrates a tunable, narrowband Tm:YAP laser using a TC-VBG, achieving a wide tuning range from 1940 nm to 1960 nm. This represents the widest tuning range near 2 μm obtained with this method, offering an efficient, simple, compact solution for tunable diode pumped solid state lasers with narrow linewidth. Future work will focus on achieving pulsed regime operation.
研究不足
Practical limitations to TC-VBG chirp rate and size limit the total tuning range accessible with one TC-VBG. The study also notes the challenge of reducing the laser spectral width below 0.1 nm at higher powers.
1：Experimental Design and Method Selection:
The study involves designing a Tm:YAP laser with a TC-VBG as an output coupler to achieve tunable narrowband emission. The cavity includes a high reflective dielectric concave mirror, a thulium-doped YAP rod, and a TC-VBG with specific reflectivity and bandwidth.
2：Sample Selection and Data Sources:
The laser is pumped with a 9 W laser diode emitting near 790 nm.
3：List of Experimental Equipment and Materials:
High reflective dielectric concave mirror, 4 mm long 4 %at. thulium doped a-cut YAP rod, TC-VBG with 1940 to 1960 nm tuning range, 85 % reflectivity and
4：8 nm bandwidth, 9 W laser diode. Experimental Procedures and Operational Workflow:
The laser's performance is evaluated based on threshold power, efficiency, output power, and spectral width under varying pumping conditions.
5：Data Analysis Methods:
The laser spectrum is analyzed using an optical spectrum analyzer with 0.050 nm resolution.
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