研究目的
Developing a laser system for studying parametric amplification of femtosecond pulses with a centre wavelength of ~2 mm pumped by picosecond pulses of ytterbium laser.
研究成果
The developed laser system provides femtosecond radiation with a centre wavelength in the range of 2 mm and demonstrates potential for applications in ultrafast laser spectroscopy and attosecond physics. Future work aims to increase the signal energy to a millijoule level and achieve terawatt peak power.
研究不足
The spectral sensitivity of the SHG-FROG device is limited by a wavelength of 2100 nm, and the breakdown threshold of dielectric coatings affects the maximum achievable pulse energy. The study also notes potential areas for optimization in the amplifier design and pulse compression techniques.
1：Experimental Design and Method Selection:
The study involves the development of a laser system with optical synchronisation of a femtosecond signal with a pump channel, using a ytterbium fibre laser and disk amplifiers for signal and pump amplification.
2：Sample Selection and Data Sources:
The signal from a sub-picosecond ytterbium laser is used, with specific parameters for pulse energy, duration, and repetition rate.
3：List of Experimental Equipment and Materials:
Includes BBO crystals, YAG crystal, dichroic mirrors, spherical mirrors, delay lines, filters, and a commercial device based on the SHG-FROG approach.
4：Experimental Procedures and Operational Workflow:
Detailed steps include signal amplification, pulse compression, generation of femtosecond laser pulses, and parametric amplification.
5：Data Analysis Methods:
Spectral and temporal distributions of intensity are measured, and pulse duration is analyzed using the FROG method.
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