Thin-disk regenerative amplifier and amplification method

A thin-disk regenerative amplifier, comprising an input and output optical path and an amplification optical path;

• wherein a seed laser is input into the thin-disk regenerative amplifier through the input and output optical path, and reflected and amplified by the amplification optical path to obtain an amplified laser, and the amplified laser is output through the input and output optical path after an energy level of the amplified laser reaches a predetermined threshold;
• wherein the input and output optical path comprises an optical isolator, a first polarization beam splitter, an optical rotator, a second polarization beam splitter, a first reflective minor, and a second reflective minor;
• wherein the amplification optical path comprises an input minor, a thin-disk crystal, a pumping device, a first concave reflective mirror and a second concave reflective mirror, and the pumping device is configured to provide pumping light for the thin-disk crystal;
• wherein a distance between the thin-disk crystal and the first concave reflective mirror is d1, a distance between the first concave reflective mirror and the second concave reflective minor is d2, a focal length of the first concave reflective mirror is f1, a focal length of the second concave reflective minor is f2, and a relationship between d1, d2, f1 and f2 comprises:
• d
• 1
• =
• (
• f
• 1
• 2
• +
• 2
• ⁢
• f
• 1
• ⁢
• f
• 2
• )
• /
• (
• 2
• ⁢
• f
• 2
• )
• ⁢
• d
• 2
• =
• f
• 1
• +
• 2
• ⁢
• f
• 2
• ⁢
• 1
• f
• 1
• =
• 1
• d
• 1
• +
• 1
• d
• 2
• wherein a number of times that the seed laser passes through the thin-disk crystal in a single round trip in the amplification optical path meets a relationship of 4×(r-r_beam)/1, where r represents a radius of the first concave reflective mirror and a radius of the second concave reflective mirror, r_beam represents a spot radius of the seed laser at the first concave reflective mirror and the second concave reflective minor, and 1 represents an offset distance of each incidence of the seed laser on the first concave reflective minor and the second concave reflective mirror.