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

Claim 3:
4. The laser system of claim 3, comprises a first Faraday rotator (FR1) disposed between the first optical isolator and a first portion of the multi-stage pre-amplifier, wherein the FR1 performs a double pass on the first pulsed laser beam by first rotating the FR1 to allow a forward pass of the first pulsed laser beam to be first pre-amplified by the first portion of the multi-stage pre-amplifier to a first pre-amplified beam, and second rotating the FR1 to allow a reverse pass of a second pre-amplified beam of the first pulsed laser beam, which is after the first pre-amplified beam being reflected by a first mirror and then passing through the first portion of the multi-stage pre-amplifier to be second pre-amplified in a reversed direction to be the second pre-amplified beam.