Output module for high-power external-cavity tunable quantum cascade laser

An output module for a high-power external-cavity tunable quantum cascade laser, comprising:

• a first laser, wherein a first lens, a first half-wave plate and a first mid-infrared wire-grid polarizer are successively arranged along an optical path of the first laser;
• a second laser, wherein a second lens, a second half-wave plate, a second mid-infrared wire-grid polarizer and a third half-wave plate are successively arranged along an optical path of the second laser;
• and a third mid-infrared wire-grid polarizer, wherein emergent lights of the first mid-infrared wire-grid polarizer and the third half-wave plate converge on different surfaces of the third mid-infrared wire-grid polarizer;
• wherein by setting an inclination angle for the third mid-infrared wire-grid polarizer, a beam combination is achieved by combining a transmitted light that is the emergent light from the first mid-infrared wire-grid polarizer and that passes through the third mid-infrared wire-grid polarizer with a reflected light that is the emergent light from the third half-wave plate and that is reflected on the surface of the third mid-infrared wire-grid polarizer;
• wherein the output module further comprises a first blazed grating and a second blazed grating, wherein the first blazed grating is arranged on a reflection optical path of the first mid-infrared wire-grid polarizer, and the second blazed grating is arranged on a reflection optical path of the second mid-infrared wire-grid polarizer.