The influence on the level of amplified spontaneous emission (ASE) contrast resulting from the different seed pulse energies has been experimentally studied in a 10-TW-level femtosecond Ti:sapphire chirped pulse amplification laser. It is found that, with the seed pulse energy increasing, the ASE pedestal is suppressed more efficiently, and the ASE contrast is improved with a saturable tendency. The measurement of ~2×10<sup>-8</sup> ASE contrast in the range of more than 50 ps before the main pulse is achieved in the laser.
© 2010 Chinese Optics Letters
Yi Xu, Yuxin Leng, Lihuang Lin, Wenyao Wang, Yansui Huang, Ruxin Li, and Zhizhan Xu, "Amplified spontaneous emission contrast of CPA laser," Chin. Opt. Lett. 8, 123-125 (2010)