Laser oscillation amplifier comprising semiconductor laser shaping device

A laser oscillation amplifier, comprising:

• a seed laser configured to produce an input laser beam;
• a pumping source configured to produce a pump light;
• a semiconductor laser shaping device configured to receive the pump light and to produce a shaped pump light;
• a beam combiner configured to combine the shaped pump light and the input laser beam;
• and
• a gain fiber coupled with the beam combiner and configured to absorb the shaped pump light and to amplify the input laser beam to produce an output laser beam,
• wherein the semiconductor laser shaping device includes:
• a half wave plate;
• a polarization beam combining prism;
• and
• a crawling prism group arranged along an optical path,
• wherein the pump light is sequentially collimated by a slow axis collimating lens along a slow axis to produce a collimated pump light,
• wherein portions of the collimated pump light are injected into the half wave plate and the polarization beam combining prism, which folds and compresses a spot size of the collimated pump light along the slow axis to produce a compressed light beam having a single beam spot, while keeping the spot size unchanged along a fast axis, wherein the compressed light beam comprises a first portion and a second portion along the slow axis, wherein the compressed light beam subsequently passes through the crawling prism group to produce the shaped pump light,
• wherein the crawling prism group comprises a first crawling prism comprising a first reflective surface and a second reflective surface,
• wherein the first reflective surface is configured to reflect the first portion of the compressed light beam toward the second reflective surface;
• and
• a second crawling prism comprising a third reflective surface and a fourth reflective surface,
• wherein the third reflective surface is configured to reflect the second portion of the compressed light beam toward the fourth reflective surface, which shifts the second portion of the compressed light beam relative to the first portion of the compressed light beam along the fast axis,
• wherein the second reflective surface and the fourth reflective surface are configured to respectively reflect the first portion and the second portion of the compressed light beam, which shifts the second portion of the compressed light beam relative to the first portion of the compressed light beam along the slow axis, thereby outputting a compact beam spot comprising the first portion and the second portion of the compressed light beam positioned side by side along the fast axis.