研究目的
Investigating the generation of high power vacuum-ultraviolet laser at 165 nm by eighth-harmonic generation in KBBF.
研究成果
The study successfully demonstrated a high power ns VUV laser at 165 nm with a maximum output power of 6.8 mW, the highest for all solid-state lasers below 170 nm. Theoretical simulations closely matched experimental results, confirming the optimal thickness of the KBBF crystal for high VUV output power. The pulse width, beam quality factor, and spatial intensity profile of the 165 nm radiation were also analyzed, providing insights for future applications.
研究不足
The technical constraints include the thermal effect in KBBF-PCD due to absorption loss at 165 nm, which can break the phase matching condition and reduce output radiation. The application constraints involve the complexity of the system requiring precise synchronization of pump beams for sum frequency mixing techniques.
1：Experimental Design and Method Selection:
The experiment involved generating a VUV laser at 165 nm by frequency-octupling a 1319 nm Nd:YAG laser using a KBBF crystal. The methodology included numerical simulation of the ns KBBF SHG process based on coupled wave equations, considering linear absorption, pump depletion, beam spatial birefringent walk-off, diffraction, and the absorption loss of 165 nm light in the CaF2 prism.
2：Sample Selection and Data Sources:
A thick KBBF crystal of 1.69 mm was used to achieve higher VUV output power. The 1319 nm oscillator provided a maximum average output power of 23.2 W, operating at 1 kHz with a pulse width of 75 ns and beam quality factor M2 of 1.
3：69 mm was used to achieve higher VUV output power. The 1319 nm oscillator provided a maximum average output power of 2 W, operating at 1 kHz with a pulse width of 75 ns and beam quality factor M2 of List of Experimental Equipment and Materials:
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3. List of Experimental Equipment and Materials: Equipment included a Nd:YAG laser, LBO crystals for UV output, a KBBF crystal for VUV radiation, and various optical components like lenses, mirrors, and wave-plates.
4：Experimental Procedures and Operational Workflow:
The 1319 nm beam was converted to 660 nm and then to 330 nm before being used to pump the KBBF crystal for EHG. The generated 165 nm beam was measured using a thermo-sensitive power meter.
5：Data Analysis Methods:
The output characteristics were analyzed using numerical simulations based on the coupled wave equations, with results compared to experimental data.
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