研究目的
To demonstrate a single-frequency ring laser using two standard commercial diode-pumped Nd:YAG modules, achieving high output power and single-frequency operation at 532 nm.
研究成果
The study successfully demonstrated a single-frequency ring laser with high output power and single-frequency operation at 532 nm. The strategy of using a single, large, joint stability zone in the resonator design increased laser stability and single-transverse mode output power. Future work could focus on optimizing the LBO coatings to improve SHG performance.
研究不足
The low performance in SHG is credited mainly to the non-optimal reflectivity of the LBO coatings at 1064 nm. The high laser threshold is due to the resonator project optimized for high power output, presenting a small stability interval and thus small dynamic range.
1：Experimental Design and Method Selection:
The resonator consisted of a symmetric bow-tie resonator with mirrors of specific curvatures and reflectivities. A dynamically stable resonator design was employed to achieve multi-longitudinal mode operation at 1064 nm and single-frequency output at 532 nm with the insertion of a LBO crystal.
2：Sample Selection and Data Sources:
The experiment used two standard commercial diode-pumped Nd:YAG modules (DPL-1064-S1-0075, HTOE Optoelectronics) with a water-cooled doped Nd:YAG rod.
3：List of Experimental Equipment and Materials:
Equipment included diode pump modules, a Fabry-Perot interferometer (Burleigh), a half wave plate (HWP), a terbium gallium garnet (TGG) crystal, and a LBO crystal (Bluebeam optical tech Inc).
4：Experimental Procedures and Operational Workflow:
The setup involved adjusting the resonator for unidirectional operation, inserting the LBO crystal for SHG, and measuring the output power and linewidth.
5：Data Analysis Methods:
The longitudinal mode structure was investigated using a Fabry-Perot interferometer, and the beam waist inside the Nd:YAG rod was simulated using LasCad software.
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