A device for generating cascaded third harmonic

Abstract

The invention discloses a cascaded third harmonic generation device, which belongs to the field of nonlinear optics. It includes a fundamental frequency light source system, a temperature control furnace and a multi-period cascaded crystal; the fundamental frequency light source system is connected with a half-wave plate, a Glan prism, an aperture diaphragm and the first focusing lens, and the incident beam is cascaded through a multi-period The second harmonic and the fundamental wave generated by the crystal are combined with each other to generate the third harmonic output; the output light wave passes through the second focusing lens, high reflection mirror, and band-pass filter, and then is received by the detector. The invention integrates the frequency doubling and sum frequency process on a multi-period cascaded crystal, by changing the action area of ​​the multi-period cascaded crystal and the fundamental wave, the phase matching of the two nonlinear processes can be realized at the same time, the system structure is compact, and the design Flexible; can realize stable and efficient broadband cascaded third harmonic output.

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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