Patent ID: 11858065
Assignee: nan
Field: Optics (Instruments)
Classification: CPC B  H | IPC B

Claim 5:
6. The laser system of claim 5, comprises a second Faraday rotator (FR2) disposed between the second optical isolator and a second portion of the multi-stage pre-amplifier, wherein the FR2 performs a double pass on the second pre-amplified beam by first rotating the second Faraday rotator (FR2) to allow a forward pass of the second pre-amplified beam to be third pre-amplified by the second portion of the multi-stage pre-amplifier to a third pre-amplified beam, and second rotating the FR2 to allow a reverse pass of a fourth pre-amplified beam of the first pulsed laser beam, which is after the third pre-amplified beam being reflected by a second mirror and then to be fourth pre-amplified in a reversed direction to be the fourth pre-amplified beam.