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The use of a rapid scanning Fabry–Pérot (F–P) interferometer as a scanning spectral filter to improve the amplified spontaneous emission (ASE) contrast in a chirped pulse amplification (CPA) laser is proposed and analyzed numerically. The numerical simulation results show that the ASE contrast can be improved by the rapid scanning Fabry–Pérot interferometer by about two orders, and the transmission efficiency of the chirped pulse can exceed 80% with the synchronizing time jitter ranging from  − 5 to 5 ps. Use of the cascaded rapid scanning F–P interferometer method to improve the ASE contrast is investigated too, which can improve the ASE contrast further.

The laser power and beam quality of the high-power CO(2) laser are very important for laser applications. The multichannel slab discharge CO(2) laser (MSDL) and the multichannel discharge tube CO(2) laser (MDTL) are two main lasers, which have different functions. Two lasers and laser beams are compared and studied quantitatively from the following factors: intensity distribution, M(2) factor, phase locking, misalignment, and output power. It is shown that MSDL could obtain the laser beam with high power when the misaligned angle is small, but the beam quality is poor in comparison with that of MDTL. MSDL is more sensitive to the misaligned angle than MDTL.