研究目的
To develop a Tm:LuAG actively mode-locked laser operating in CWML regime, focusing on achieving stable continuous-wave mode-locked operation with a specific wavelength and beam quality.
研究成果
The study successfully demonstrated a Tm:LuAG acousto-optic CWML laser with stable operation, achieving a maximum output average power of 335 mW at 2023.2 nm. The laser exhibited excellent beam quality and wavelength tunability, making it suitable for applications requiring precise material processing and nonlinear frequency conversion.
研究不足
The high doping concentration of the Tm:LuAG crystal led to serious thermal effects, limiting the stable region of the resonator and resulting in low optical conversion efficiency. The pump laser wavelength was adjusted to avoid absorption peaks, which may not be optimal for all applications.
1：Experimental Design and Method Selection:
The resonator was double Z-shaped with eight mirrors, utilizing a Tm:LuAG crystal as the active medium. The laser was pumped by a 786 nm laser diode, and an acousto-optic modulator (AOM) was used for mode-locking.
2：Sample Selection and Data Sources:
A Tm:LuAG crystal with 6 at.% doping concentration, 4 × 4 mm2 cross-section, and 8 mm length was used. The pump source was a 786 nm LD.
3：List of Experimental Equipment and Materials:
Equipment included mirrors with specific reflectivities and transmissions, a YAG etalon, an AOM, a Tm:LuAG crystal, and a 786 nm LD.
4：Experimental Procedures and Operational Workflow:
The setup involved adjusting the cavity length and using an etalon to stabilize the output wavelength. The AOM was cooled to maintain temperature stability.
5：Data Analysis Methods:
Output power, pulse width, and beam quality were measured using a power meter, fast InGaAs detector, oscilloscope, and RF spectrum analyzer.
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