研究目的
Investigating the conversion of femtosecond pulses of an ytterbium laser into shorter Stokes pulses with a different wavelength using stimulated Raman scattering in compressed hydrogen under conditions of nonlinear phase modulation.
研究成果
The study successfully demonstrated the conversion of 400-fs ytterbium laser pulses into 27-fs Stokes pulses at a wavelength of 1.8 mm using SRS in compressed hydrogen, achieving an average Stokes power of 0.6 W. The scheme shows promise for applications requiring femtosecond mid-IR pulses with high peak powers.
研究不足
The conversion efficiency decreases with an increase in the pulse repetition rate, likely due to gas heating in the capillary. The scheme's applicability to other types of lasers and the optimal conditions for maximum conversion efficiency and pulse compression require further investigation.
1：Experimental Design and Method Selection:
The study involved the use of stimulated Raman scattering (SRS) for frequency conversion of femtosecond ytterbium laser pulses in compressed hydrogen, focusing on nonlinear phase modulation and temporal compression of the resulting Stokes pulses.
2：Sample Selection and Data Sources:
The experiments were conducted using a femtosecond ytterbium laser system (TETA-10 by Avesta) and compressed hydrogen as the Raman-active medium.
3：List of Experimental Equipment and Materials:
The setup included a femtosecond ytterbium laser system, a calcite crystal for generating double pump pulses, a quartz capillary filled with compressed hydrogen, and fused silica plates for pulse compression.
4：Experimental Procedures and Operational Workflow:
The laser pulses were converted into double pulses using a calcite crystal, then focused into a hydrogen-filled quartz capillary for SRS conversion. The resulting Stokes pulses were temporally compressed using fused silica optical elements.
5：Data Analysis Methods:
The duration of compressed Stokes pulses was measured using an autocorrelator, and the pulse spectra were recorded using a mid-IR spectrometer.
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