Light path structure for implementing spectral of YAG laser frequency doubling multiple harmonic

Abstract

The invention relates to an optical structure for realizing spectrocolorimetry through multiplication frequency multiple harmonic waves on yttrium aluminum garnet (YAG) laser. The structure is manufactured as follow: it provides a first interference filter, a second interference filter, a third interference filter, a fourth interference filter. The first and the second interference filter are installed according to right and left axis tilt angle of 45degree from left to right in the laser beam propagation direction of the optical axis. The 1064nm band and 532nm band of laser beams go through the first interference filter, and 1064nm band of laser beams go through the second interference filter, and the fourth interference filter is installed parallel with the reflection beams direction of the first interference filter, and the third interference filter is installed parallel with the reflective beams direction of the second interference filter. The third interference filter reflects 532nm laser beams, and the fourth interference filter reflects 355 nm laser beams.

Description

technical field [0001] The invention belongs to the field of laser application technology and relates to an optical path structure for realizing light splitting by frequency doubling multiple harmonics of yttrium aluminum garnet laser. technical background [0002] It is well known in the industry that the YAG laser has three different wavelengths of 1064nm, 532nm, and 355nm in the laser beam after twice frequency doubling and three times doubling. These three kinds of laser beams with different wavelengths are used as monochromatic light sources, which are very useful in laser application technology, scientific experiments, and industrial applications. Therefore, it is necessary to separate them to have practical significance. [0003] In the prior art, the conventional beam splitting is to use a prism to split the beam, as shown in FIG. 1 : the dispersion effect of the prism 1 can be found in the optical part of the general physics textbook of the university. However, it ...

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Problems solved by technology

However, it is also difficult to obtain beams of different wavelengths by using a prism to split the light. This method of splitting has strict requirements on the angle of incidence of the incident light. It is very large, and the angle difference of the beams of different wavelengths after dispersion is not very large, and the separation degree of the three beams is not great. To make the three beams clearly separated, it requires a longer propagation distance, which increases the size of the instrument. Large, which brings difficulties to the miniaturization of the instrument. At the same time, the performance parameters of the surface coating of the prism depend on the incident angle, that is, the uncertainty of the incident angle of the beam is difficult to ensure the optimal angle parameter selection of the surface coating of the prism.

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