Cascade triple frequency harmonic generating device

Abstract

The invention discloses a cascade triple frequency harmonic generating device which belongs to the field of nonlinear optics. The cascade triple frequency harmonic generating device comprises a base frequency light source system, a temperature control furnace and a multi-period cascade crystal, wherein the base frequency light source system is connected with a half wave plate, a Glan prism, an aperture diaphragm and a first focusing lens, wherein second harmonics are generated by an incident light beam through multi-period cascade, then the second harmonics and fundamental waves are subjectedto sum frequency to output triple frequency harmonic; the output light waves pass through a second focusing lens, a high reflection mirror and a bandpass filter, and then are received by a detector. According to the cascade triple frequency harmonic generating device, a frequency doubling process and a sum frequency process are integrated on a multi-period cascade crystal; by changing an action region of the multi-period cascade crystal and the fundamental waves, phase matching of two nonlinear processes can be simultaneously realized. The cascade triple frequency harmonic generating device iscompact in structure and flexible in design. Stable and efficient wideband cascade triple frequency harmonic output can be realized.

Description

technical field [0001] The invention belongs to the field of nonlinear optics, in particular to a device for realizing cascaded third harmonic generation by using a multi-period structure nonlinear crystal. Background technique [0002] The third harmonic is widely used in various fields of nonlinear optics, such as the measurement of third-order nonlinear susceptibility, the accumulation study of nonlinear phase shift, the propagation of polychromatic solitons, etc. In addition, the third harmonic is an intermediate means to generate higher harmonics. For example: the fourth harmonic generated by the mixing of the third harmonic and the fundamental wave can be used in the manufacture of gratings for communication optical fibers. The fifth harmonic deep ultraviolet laser generated by mixing the third harmonic and frequency doubled light wave can be used for photoresist material etching and so on. [0003] There are two ways to generate the third harmonic laser. One is to d...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the existing cascaded third harmonic generation device is usually composed of two crystals, which has a complex structure, is not conducive to structural integration, high tuning difficulty, unstable third harmonic output, and low conversion efficiency. , providing a method for generating cascaded third harmonic lasers capable of obtaining stable output, high optical conversion efficiency, and good beam quality, and a cascaded third harmonic frequency conversion device with simpler structure and more convenient tuning

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