Fig. 1. Schematic of experimental setup

Fig. 2. Spectrum of signal light at each stage in system. (a) Spectra after oscillator, stretcher, and DCF(pulse repetition frequency: 500 kHz); (b) spectra after main-amplifier and compressor(pulse repetition frequency: 500 kHz); (c) spectra after oscillator, stretcher, and DCF(pulse repetition frequency: 1 MHz); (d) spectra after main-amplifier and compressor(pulse repetition frequency: 1 MHz)

Fig. 3. Beam diameter of signal light at each position in un-folded Martinez-type pulse stretcher

Fig. 4. Mode-locked pulse width after oscillator or pre-amplifier

Fig. 5. Output powers of main-amplifier and compressor in CPA system as well as compression efficiencies. (a) Pulse repetition frequency is 500 kHz; (b) pulse repetition frequency is 1 MHz

Fig. 6. Power stability of CPA system (beam quality shown in inset)

Fig. 7. Pulse width and phase from SHG-FROG measurement

Fig. 8. Green light power and SHG efficiency versus IR laser input power (green light spectrum shown in inset)