US Patent No. 10,535,975

HIGH POWER SUB-400 FEMTOSECOND MOPA WITH SOLID-STATE POWER AMPLIFIER


Patent No. 10,535,975
Issue Date January 14, 2020
Title High Power Sub-400 Femtosecond Mopa With Solid-state Power Amplifier
Inventorship Andrei Starodoumov, Campbell, CA (US)
Norman Hodgson, Belmont, CA (US)
Assignee Coherent, Inc., Santa Clara, CA (US)

Claim of US Patent No. 10,535,975

1. Laser apparatus, comprising:a fiber-laser oscillator delivering optical pulses having a first pulse-duration, the pulses having a center-wavelength between 1038 nanometers and 1052 nanometers;
a pulse-stretcher arranged to stretch the duration of the optical pulses to a second pulse-duration longer than the first pulse-duration;
at least one fiber-amplifier arranged to amplify the stretched optical pulses;
a solid-state multi-pass amplifier including a gain-element made of ytterbium-doped yttrium aluminum garnet having a peak-gain wavelength of about 1030 nm, arranged to further amplify the amplified stretched optical pulses from the fiber-amplifier; and
a pulse-compressor arranged to reduce the duration of the further-amplified optical pulses from the solid-state multi-pass amplifier to a duration of less than about 400 femtoseconds.