研究目的
Investigating the generation of multiple optical communication wavelengths using a dual sub-pulse train picosecond radially polarized beam KGW Raman generator.
研究成果
The dual sub-pulse train pump regime reduced the SRS threshold nearly 30% and increased the Raman conversion efficiency nearly 22% compared with the single pulse pump regime. The Raman generator radiated up to seven infrared Stokes lines simultaneously, covering the O, E, S, L optical communication channels. The maximum overall Stokes average power was 1.01 W, and the maximum Raman overall conversion efficiency was 23.1%. The Raman generator has an excellent collinear output characteristic, which can expand the application field and improve the practical value.
研究不足
The thermal lens effect became more serious as the pump power increased, which gradually affected the transverse mode and worsened the beam quality. Sparks appeared on the LPF film as the pump power continued to increase, indicating a limitation in the optical damage threshold of the LPF.
1：Experimental Design and Method Selection:
A dual sub-pulse train 1064 nm picosecond radially polarized beam pump KGW single-pass Raman generator was designed to excite the Stokes lines of both the 768 cm?1 and 901 cm?1 vibrational modes of the KGW Raman-active crystal simultaneously.
2：Sample Selection and Data Sources:
A b-cut KGW with the dimension of 7 × 7 × 30 mm3 was adopted as the Raman-active crystal.
3：List of Experimental Equipment and Materials:
The setup included a semiconductor saturable absorber mirror (SESAM) mode-locked laser, a dual sub-pulse train generator, an Nd:YAG regenerative amplifier, and an Nd:YAG power amplifier.
4：Experimental Procedures and Operational Workflow:
The dual sub-pulse train generator employed an improved Michelson interferometer scheme to divide one mode-locked pulse into a dual-pulse group. The regenerative amplifier was used to pre-amplify the power of the dual sub-pulse train and reduced the repetition frequency to 1 kHz by electro-optic modulation.
5：Data Analysis Methods:
The line width (FWHM) of the first Stokes lines was detected by a wavelength-meter, and the beam quality M2 factor was measured by the laser beam diagnostics.
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