Large aperture plasma electrodes Pockels cell for multi-pass amplified scheme of SGII upgrading laser

Dengsheng Wu; Feng Jing; Ping Li; Xiongjun Zhang; Jun Zhang; Xiaolin Tian

doi:10.1117/12.924631

15 May 2012 Large aperture plasma electrodes Pockels cell for multi-pass amplified scheme of SGII upgrading laser

Dengsheng Wu, Feng Jing, Ping Li, Xiongjun Zhang, Jun Zhang, Xiaolin Tian

Proceedings Volume 8433, Laser Sources and Applications; 84331W (2012) https://doi.org/10.1117/12.924631
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

The multi-pass amplified scheme of SGII upgrading laser is similar as that of NIF. Large aperture plasma electrodes Pockels cell (PEPC) is the key unit of this amplified scheme. The transit time that laser beam passes through the PEPC for the first time and second time is about 270ns. PEPC should switch the state between ON and OFF in 270ns. The response time of the PEPC driven by positive-negative switching pulses can not satisfy the demand of SGII upgrading laser due to the higher generator impedance. In the single-pulse-process, the low-impedance high voltage generator based on double Blumlein pulse-forming line is used to drive the PEPC. The amplitude of single pulse is up to 21kV, while the impedance of the generator is only 6.25Ω. The theoretical charge time of the PEPC with 350mm×350mm aperture is about 54ns, and the response time of PEPC is less than 170ns in the single-pulse-process. The response time is reduced greatly. The switching efficiencies with full aperture are higher than 99.7%. The extinction contrast exceeds 381. The top width of the time window is larger than 160ns, and the bottom width is about 400ns. All the experimental results can meet the specification of SGII upgrading laser.

Citation Download Citation

Dengsheng Wu, Feng Jing, Ping Li, Xiongjun Zhang, Jun Zhang, and Xiaolin Tian "Large aperture plasma electrodes Pockels cell for multi-pass amplified scheme of SGII upgrading laser", Proc. SPIE 8433, Laser Sources and Applications, 84331W (15 May 2012); https://doi.org/10.1117/12.924631

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