Device for generating broadband supercontinuum laser and manufacturing method of crystal in device

Abstract

The invention provides a device for generating broadband supercontinuum laser by utilizing a synergistic effect of second-order and third-order nonlinear optical effects. The device comprises a pump light source and a non-linear laser crystal, and is characterized in that the pump light source is a near-infrared femtosecond pulse laser light source, the frequency of femtosecond pulse laser provided by the pump light source has a bandwidth close to 100nm, and the femtosecond pulse laser has the characteristic of high peak power; the nonlinear laser crystal is made of a ferroelectric crystal material, the nonlinear laser crystal comprises a series of cells, and the length of the series of cells in the light propagation direction is changed along the light propagation direction according to acontinuous chirp change rule. In nonlinear laser crystal, the spectral width of a pumping spectrum can be effectively extended from 100nm to about 300-500nm by using a significant third-order nonlinear optical effect, and supercontinuum and completely coherent laser capable of covering the near 500nm bandwidth from a visible band to a near-infrared band is generated by using second-order nonlinear frequency conversion; the device has the advantages of controllable structure, easy preparation and flexible design; and the energy conversion efficiency is high, the laser spectrum broadband is supercontinuum, and the device size is small.

Description

technical field [0001] The invention relates to the field of laser technology, in particular, the invention relates to a device for generating broadband supercontinuum laser by synergistic action of second-order and third-order nonlinear optical effects and a manufacturing method of the corresponding nonlinear laser crystal. Background technique [0002] Since the birth of laser, laser technology has great application value in national defense, medical treatment, industry, communication and other fields. In recent decades, laser technology has achieved tremendous development, and it has been widely used in various fields of modern science. However, the frequency of laser output is limited by the energy level of the gain medium, and output of any frequency cannot be produced. In addition to looking for new laser crystal materials, people often need to use second-order nonlinear frequency conversion technology (frequency doubling, sum frequency, difference frequency, parame...

AI Technical Summary

Problems solved by technology

This solution still has the disadvantage of low conversion efficiency, and its spectral broadening range is only in the visible spectrum band or in the infrared spectral band, and there are still shortcomings in that the broadening is not large enough.

In addition, the supercontinuum laser source in this scheme is not a completely coherent laser source, that is, the radiated light is coherent laser in a specific narrow band, but there is no good coherence between the radiated light of different colors, which limits The scope of application of the light source

For example, it is impossible to use the supercontinuum laser source to generate ultrashort pulse laser

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