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We report on our high-contrast laser based on high-contrast,high-energy seed injection,low-gain optical parametric chirped pulse amplification(OPCPA),and Nd:glass amplifiers,which can be used as the high-contrast front end of a high-power Nd:glass chirped pulse amplification(CPA) laser system.The energy of the stretched1053 nm high-contrast seed pulse increases to 60 μJ by optimizing the frequency doubling crystal in the pulse cleaning device.After passing through a two-stage low-gain OPCPA,a 2-pass 2-rod Nd:glass amplifier,and a compressor the amplified pulse of 131 mJ∕282 fs is achieved.The third-order correlation scanning measurement shows that the pulse contrast in the tens of ps range is about 10~(-7)–10~(-8).With the high-contrast seed passing through the stretcher and compressor only,the contrast measurement indicates that the stretching-compressing process leads mainly to the contrast degradation of the amplified pulse.
We report on our high-contrast laser based on high-contrast, high-energy seed injection, low-gain optical parametric chirped pulse amplification (OPCPA), and Nd: glass amplifiers, which can be used as the high-contrast front end of a high-power Nd: glass chirped pulse amplification (CPA) laser system. The energy of the stretched 1053 nm high-contrast seed pulses increases to 60 μJ by optimizing the frequency doubling crystal in the pulse cleaning device. After passing through a two-stage low-gain OPCPA, a 2-pass 2-rod Nd: glass amplifier, and a compressor the amplified pulse of 131 mJ / 282 fs is achieved. the third-order correlation scanning measurement that the pulse contrast in the tens of ps range is about 10 ~ (-7) -10 ~ (-8) .With the high-contrast seed passing through the stretcher and compressor only, the contrast measurement that that stretching-compressing process leads mainly to the contrast degradation of the amplified pulse .