研究目的
To generate red and near-infrared laser emissions through a Raman-assisted four wave mixing process in a nonlinear Yb-doped fiber amplifier.
研究成果
The study successfully established a complete femtosecond, all-fiber laser system that used Raman-assisted FWM to generate a multi-wavelength output. The system produced 342 fs pulses of 241 nJ at 864 nm, 834 fs pulses of 21 nJ at 751 nm, and 1.9 ps pulses of 3.8 μJ at 1030 nm. Future work could explore stronger pump power and PCFs with larger nonlinearity for higher intensity and shorter pulse duration.
研究不足
The study did not observe the anti-Stokes lines corresponding to Stokes lines at 1203 nm and 1134 nm due to their relatively weak intensity compared to the Stokes line at 1273 nm. The pulse energies of the 1134 and 1203 nm components were too weak to access.
1：Experimental Design and Method Selection:
The study employed a Raman-assisted four wave mixing process in a nonlinear Yb-doped fiber amplifier. A pair of gratings was used as the pre-compressor to enhance the intensity of the fundamental wave in the main amplifier.
2：Sample Selection and Data Sources:
The laser system was seeded by a SESAM mode-locked oscillator at 1030 nm. The output was characterized using an autocorrelator and an optical spectrum analyzer.
3：List of Experimental Equipment and Materials:
The setup included a pulsed laser oscillator, an acoustic-optical modulator, three-stage fiber pre-amplifiers, a pre-compressor, and a main amplifier. The main amplifier was composed of a 1-m-long, Yb-doped PCF.
4：Experimental Procedures and Operational Workflow:
The laser system was pumped by a fiber-coupled multimode laser diode with a central wavelength of 976 nm. The output pulse energy and spectral properties were measured under varying pump power levels.
5：Data Analysis Methods:
The spectral intensity and autocorrelation of the compressed pulse were measured. The pulse duration was retrieved by hyperbolic secant fitting.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
