External cavity feedback type diode laser spectrum synthesis optical system in compact layout

Abstract

The invention discloses an external cavity feedback type diode laser spectrum synthesis optical system in compact layout. The system comprises a diode laser, a slow-axis transformation column lens, a diffraction grating, a focusing column lens and an external mirror, wherein the diffraction grating is positioned on a rear focal plane of the slow-axis transformation column lens; the focusing column lens is arranged between the outer mirror and the diffraction grating; the focusing column lens and the slow-axis transformation column lens form a lens set; an equivalent front focal plane of the lens set is positioned within a range which is twice the focal length at the front end of the slow-axis transformation column lens; the diode laser is positioned on the equivalent front focal plane of the lens set; the outer mirror is positioned on the equivalent rear focal plane of the lens set; after laser emitted by the diode laser passes through the slow-axis transformation column lens, the diffraction grating and the focusing column lens, beams exit in parallel and vertically enter the outer mirror; after the beams are reflected by the outer mirror, the laser is returned to an original light emitting unit through an original light path to form a complete oscillating loop. According to the diode laser spectrum synthesis system, nearly half of the size is reduced, so that the integral volume size of the laser system is reduced, and further the compact layout of the system is realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to an external cavity feedback type diode laser spectrum synthesis optical system with a compact layout. The spectrum synthesis system is more compact and miniaturized than the general external cavity feedback synthesis system. Background technique [0002] Diode lasers have a series of advantages such as high electro-optical efficiency, wide wavelength coverage, small size, light weight, and high reliability. However, the current high-power diode lasers have poor beam quality and large divergence angles, which limit their direct application fields. The use of diode laser spectrum synthesis technology can make the quality of the synthesized beam equal to that of the sub-light-emitting units participating in the synthesis, which makes up for the shortcomings of the poor beam quality of diode lasers, and greatly improves the luminous brightness of diode lasers. Therefore, d...

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Problems solved by technology

[0002] Diode lasers have a series of advantages such as high electro-optic efficiency, wide wavelength coverage, small size, light weight, and high reliability. However, the current high-power diode lasers have poor beam quality and large divergence angles, which limit their direct application fields.

Due to the requirement for the spectral width of the synthesized laser, the focal length of the slow-axis conversion lens is often designed to be relatively large, resulting in a relatively large volume of the synthesized system, which is not conducive to the compact and miniaturized design of the laser system

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