Patent ID: 7903715

Claim:
A slab type laser apparatus including a slab type gas laser medium part formed in a region defined by a pair of electrode flat plates oppositely disposed in parallel with each other in a space to be filled with a gas laser medium, said gas laser medium being excited when high-frequency electric power is applied to said pair of electrode flat plates in the space filled with the gas laser medium, said apparatus comprising: an oscillator part including a pair of resonator mirrors oppositely disposed with a part of said slab type gas laser medium part in between, and a coupling unit, said oscillator part amplifying a laser beam oscillated in said oscillator part to have predetermined light intensity, and thereafter driving said coupling unit to emit the laser beam; and an amplifier part including an incidence mirror for deflecting the laser beam emitted from said oscillator part, and a plurality of return mirrors oppositely disposed with a part of said slab type gas laser medium part in between, said amplifier part configured such that a laser beam goes and returns plural times between said plurality of return mirrors, and said amplifier part receiving the laser beam emitted from said oscillator part, and amplifying the laser beam to an amplified laser beam having predetermined power to output the amplified laser beam.