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A Visible to Ultraviolet Band Optical Frequency Converter

A frequency conversion, ultraviolet band technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of difficult crystal growth, limited application of high-efficiency lasers, limited crystals by raw material toxicity, and achieves simple structure, strong controllability, and compensation. Effects of insufficient phase mismatch

Active Publication Date: 2020-04-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, lasers in the visible to ultraviolet bands can be realized based on birefringence, and have been applied in many fields related to national economy and national security. However, the phase matching method of crystal birefringence requires the crystal to have appropriate birefringence, and most of them are excluded. Crystals without suitable birefringence limit the acquisition of high-efficiency lasers, especially in the application of ultraviolet or even deep ultraviolet lasers
Limited by the phase matching conditions, only the layered potassium beryllium fluoroborate (KBBF) crystal has achieved effective frequency doubling in the deep ultraviolet, but the crystal growth is difficult due to its layered habit, and the toxicity of the raw material also greatly limits the crystal's performance. get

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  • A Visible to Ultraviolet Band Optical Frequency Converter
  • A Visible to Ultraviolet Band Optical Frequency Converter
  • A Visible to Ultraviolet Band Optical Frequency Converter

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: Quartz crystal deep ultraviolet wavelength 177.3nm frequency doubler converter

[0049] The preparation process of the optical frequency conversion device: using quartz crystal as the nonlinear optical crystal, the crystal processing method is as follows figure 1 As shown, using the maximum nonlinear coefficient d 11 , the quartz crystal is cut in the Z direction, and a grating structure with a periodic refractive index distribution is formed by laser etching in the Z direction of the light transmission direction, in which the photolithographic area provides an additional periodic phase, and the width of the processed area and the unprocessed area are both 0.7 μm . The additional periodic phase difference between the fundamental frequency light and the frequency doubled light that can be provided in the processing area is π, the crystal length in the entire processing area is 1mm, the crystal cross section is 3mm×3mm, and the surface is polished. The pe...

Embodiment 2

[0054] Embodiment 2: Quartz crystal ultraviolet wavelength 213nm frequency multiplication converter

[0055] As described in Example 1, the difference is that the pump source 7 is a pulsed laser with a wavelength of 426 nm, its pulse width is 10 ns, its repetition frequency is 50 Hz, and the section of the quartz crystal is 5×3 mm, wherein the processing area and The width of the unprocessed area is 1.4 μm. The phase difference between the fundamental frequency light and the frequency doubled light provided by the processed area is π. Increase the pump power to achieve laser output with an ultraviolet wavelength of 213nm. The output wavelength is as follows: Figure 5 shown.

Embodiment 3

[0056] Embodiment 3: Quartz crystal visible wavelength 770nm frequency multiplication converter

[0057] As shown in Example 1, the difference is that the pump source 7 is a femtosecond pulse laser with a wavelength of 1540nm, a pulse width of 500fs, a repetition rate of 200MHz, a quartz crystal cross section of 4×4mm, and a crystal length of 50mm. The surface is coated with a dielectric film with high transmittance of 1540nm and 770nm, no calcium fluoride prism splitter and glove box are required, and a grating structure with a periodic distribution of refractive index is formed by ion beam etching in the direction of light transmission Z, where each The width of the processed area and the unprocessed area in the period are both 34.4 μm, and the phase difference between the fundamental frequency light and the frequency doubled light is π. Increase the pump power, and the laser output with a visible wavelength of 770nm can be realized. The output wavelength is as follows: Fig...

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Abstract

The invention provides an optical frequency converter in the visible to ultraviolet band. By controlling the processing period of the nonlinear optical crystal to provide an additional periodic phase to meet the phase matching condition, effective optical frequency conversion is realized. The additional periodic phase is a phase grating with different refractive index periodic arrangements inside the crystal formed by laser micromachining, ion etching and other technologies, and the reverse process of nonlinear frequency conversion is prevented by the destruction of the periodic structure of the crystal in the phase grating and an additional period is provided. Phase, to make up for the phase mismatch caused by the lack of natural birefringence of nonlinear optical crystals, to achieve effective frequency multiplication or sum frequency output. The present invention can optimize nonlinear optical materials, and can also select appropriate crystals according to required wavelengths to provide matching additional periodic phases through processes such as laser lithography, so as to realize effective output of specific wavelengths. The invention provides a new type of nonlinear optical frequency conversion device, and has the advantages of high optical frequency conversion efficiency, easy preparation and the like.

Description

technical field [0001] The invention relates to a nonlinear optical crystal device, in particular to an optical frequency converter in the visible to ultraviolet band, and belongs to the field of laser technology. Background technique [0002] Nonlinear optical frequency conversion is to realize the frequency up-conversion or down-conversion of light through the nonlinear response of materials to optics. The frequency doubling is to use the up-conversion effect to achieve the effect of doubling the optical frequency and shortening the wavelength. It is the most studied and widely used effect in the field of nonlinear optics. The material basis of the frequency doubling effect is nonlinear optical frequency conversion devices. In this effect, the momentum conservation, that is, the phase matching condition, is the basic requirement for efficient optical frequency conversion. Generally, based on the dispersion relationship of the birefringence effect, the fundamental frequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35
CPCG02F1/3501G02F1/3544G02F1/353G02F1/3555
Inventor 于浩海张怀金
Owner SHANDONG UNIV
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