研究目的
To modernize the THL-100 hybrid laser system to achieve the boundary parameters required for the pumping of non-linear crystals and production of unprecedented THz radiation powers.
研究成果
The modernization of the THL-100 laser system achieved significant improvements in radiation parameters, including pulse duration and energy at both the first and second harmonics, and increased the output power of the laser beam from 14 to 40 TW. These advancements are planned to be used in experiments for the pumping of new nonlinear crystals and generation of THz radiation.
研究不足
The study does not detail the specific nonlinear effects in the glass compressor that prevent recompression of the beam to femtosecond duration when increasing the second-harmonic pulse duration to 2.4 ps and beam energy to 1–2 mJ.
The THL-100 laser system comprises the Ti:Sapphire femtosecond starting complex Start-480M and the photodissociation XeF(C-A) amplifier. The system can operate according to two optical schemes for producing different laser radiation parameters. The first scheme involves forming the second harmonic in the starting complex at the femtosecond duration of the basic frequency pulse after the grating compressor, then elongating the radiation pulse in the prism pair to 1–2 ps, amplifying it in the XeF(C-A) amplifier, and compressing it back to femtosecond duration. The second scheme involves directing the amplified radiation at the wavelength of 950 nm to a nonlinear crystal to convert it into the second harmonic, then increasing the beam diameter and directing it to the XeF(C-A) amplifier.
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