第十二讲 啁啾脉冲放大器.pptxVIP

12. Chirped Pulse Amplication(CPA) and Petawatt Lasers ;Laser intensity evolution ;Chirped pulse amplification Scheme;CPA: Why?;Pulse stretching by grating pair;Pulse to be strecthed due to GDD;Diffraction-grating pulse compressor;Mode locked oscillator as seeding light;Regenerate amplifier;Regenerate amplifier ;Optical Isolator;Multi-pass amplifier (1) ;Power amplifier;Gain narrowing ;Suppression of gain narrowing ;;OPCPA;Coupling wave equation;Group-velocity mismatch limits bandwidth.;560 TW OPCPA by Russia;Main Routes for Petawatt laser ;Petawatt example: petawatt hybrid OPCPA-Glass laser-Texas;Petawatt scheme;OPCPA scheme;Nd:glass hybrid amplifier;Suppression gain narrowing by hybrid amplification ;Compression grating ;Results;Petawatt laser facilities;Petawatt laser facilities in the world;Pulse Contrast: intensity of main pulse/ intensity of noise pulse ;The pulse contrast can be reduced significantly during its generation, propagation and amplifications. Among all the processes, contrast degradation due to ASE is fundamental (always accompanied with laser amplification);The noise pedestal will be more complicated in OPCPA. Temporal ripples in pump pulse will also degrade the contrast significantly.;Double CPA design to boost contrast;SHG boost contrast ;Questions