研究目的
Investigating the generation of high average power THz radiation through optical rectification in GaP crystals driven by a high-power thin-disk laser, and exploring the effects of crystal temperature on power scaling and thermal management.
研究成果
The study demonstrates a table-top single-cycle broadband THz source with more than 1 mW average power based on optical rectification in GaP, setting a new record for GaP. It highlights the importance of controlling the crystal temperature for further power scaling and managing thermal effects. The source is expected to be a valuable tool for THz time-domain spectroscopy experiments requiring high signal-to-noise ratio.
研究不足
The study is limited by the thermal effects in the GaP crystal at high driving powers, which can lead to thermal lensing and aberrations in the pump beam. The current setup does not allow for direct measurement of the temperature profile of the crystal.
1：Experimental Design and Method Selection:
The study employs optical rectification in GaP crystals driven by a high-power thin-disk laser compressed to sub-100 fs pulses in a multi-pass cell. The setup includes a home-built SESAM modelocked Yb:YAG thin-disk oscillator, a Herriott-type multi-pass cell for pulse compression, and a cryostat for temperature control of the GaP crystals.
2：Sample Selection and Data Sources:
GaP crystals of varying thicknesses are used to study the effect of crystal thickness on THz generation efficiency.
3：List of Experimental Equipment and Materials:
The setup includes a Yb:YAG thin-disk oscillator, a multi-pass cell, GaP crystals, off-axis parabolic aluminum mirrors, and a cryostat.
4：Experimental Procedures and Operational Workflow:
The laser pulses are compressed in the multi-pass cell and then focused onto the GaP crystal for THz generation. The THz radiation is characterized using electro-optic sampling and power measurements.
5：Data Analysis Methods:
The THz output is analyzed in terms of power, spectrum, and beam profile, with the effect of crystal temperature on generation efficiency also investigated.
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