研究目的
Investigating the performance of a continuous-wave Nd:YLF laser at 1047 nm under the 908 nm diode pumping to achieve higher output power and efficiency with reduced thermal lensing effect.
研究成果
The first continuous-wave Nd:YLF laser pumped at 908 nm was demonstrated, achieving 850 mW of average output power with good beam quality and maximum slope efficiency of 73.9%. The thermal lensing effect was significantly reduced compared to traditional ~800 nm pumping, opening a new path for power scaling of Nd:YLF lasers.
研究不足
The maximum output power was limited by the amount of the absorbed pump power, which could be enhanced by using a longer crystal with higher doping concentration.
1：Experimental Design and Method Selection:
The experiment utilized a three mirror cavity with an a-cut Nd:YLF crystal as the gain medium, pumped by a fiber coupled laser diode operating around 908 nm. A modified ABCD-matrix beam propagation technique was used to measure the thermal lensing effect.
2：Sample Selection and Data Sources:
An a-cut Nd:YLF crystal with dimensions of 3 × 3 × 10 mm3 and 1-at.% doping concentration was used. The pump was provided by a fiber coupled laser diode (M915-F105/22, Han’s TCS Ltd.).
3：List of Experimental Equipment and Materials:
Nd:YLF crystal, fiber coupled laser diode, dichroic mirror, concave mirror, output coupler, beam profiler.
4：Experimental Procedures and Operational Workflow:
The pump beam was focused into the center of the gain medium. The output beam characteristics were recorded using a beam profiler to measure the thermal lensing strength.
5：Data Analysis Methods:
The thermal lensing strength was analyzed using a modified ABCD-matrix analysis method.
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