High-power spectral synthesis method based on transmission type optical grating

Abstract

The invention relates to a high-power spectral synthesis method based on a transmission type optical grating and belongs to the technical field of high power laser. A multi-beam laser source is located at the focal point of a focusing lens and emits a plurality of parallel laser beams which are all located on the same side of the central optical axis of the focusing lens and cannot be distributed on the two sides of the central optical axis at the same time. Each laser beam orderly passes through a collimating lens and a half-wave plate and then transmits through the focusing lens. The high-power transmission type optical grating is placed at the focal point on the other side of the focusing lens and the central optical axis of the focusing lens passes through the center of the optical grating. The wavelengths of the incident laser beams are selected according to the first-level diffraction conditions of a diffraction equation so that the incident beams can be different in incident angle and the same in diffraction angle. As a result, the incident laser is output through first-level diffraction completely according to the same diffraction angle, and laser beam combination is realized. The single beams of more than 100000W can be synthesized, and the high-power transmission type optical grating is enabled to be higher than a reflective optical grating in diffraction efficiency and synthetic power.

Description

technical field [0001] The invention relates to a high-power spectrum synthesis method based on a transmission grating, which belongs to the technical field of strong lasers. Background technique [0002] Laser synthesis is becoming more and more important in industry, scientific research and military applications. Multi-beams are synthesized by means of wavelength division multiplexer WDM or beam splitting prisms, lenses, etc. Usually, multi-beam synthesis requires multiple synthesis processes, such as figure 1 , as shown in 2. However, this type of beam combination has certain restrictions on the wavelength and power of the beam. The traditional multi-beam combination process is complicated and difficult to adjust. In addition, the traditional multi-beam combination method is not suitable for high-power and ultra-high-power combination. Special wavelength Laser synthesis. For high-power beam synthesis and special wavelength laser synthesis, there is no related report. ...

AI Technical Summary

Problems solved by technology

However, this type of beam combination has certain restrictions on the wavelength and power of the beam. The traditional multi-beam combination process is complicated and difficult to adjust. In addition, the traditional multi-beam combination method is not suitable for high-power and ultra-high-power combination. Special wavelength Combination of laser beams. For high-power beam synthesis and laser synthesis of special wavelengths, there is no related report

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