Cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light

A technology of nonlinear optics and frequency conversion devices, applied in the field of laser technology and nonlinear optics, can solve the problems of inability to achieve blue-violet wavelength output and high cost, and achieve the effects of compact structure, low cost, and improved conversion efficiency

Active Publication Date: 2020-11-13
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the 0.9μm laser corresponds to Nd 3+ ion 4 f 3/2 — 4 I 9/2 The transition, which is a quasi-three-level structure, has inherent problems such as serious reabsorption loss and small stimulated emission cross section. The key to this frequency doubling scheme is to take appropriate measures to suppress the 1.06μm oscillation with a large emission cross section
In addition Nd 3+ ion 4 f 3/2 — 4 I 9/2 The wavelength of the transiti

Method used

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  • Cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light
  • Cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light
  • Cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light

Examples

Experimental program
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Effect test

Embodiment example 1

[0040] Such as image 3 As shown, the first nonlinear crystal 6 is a 532 frequency doubling crystal, and the second nonlinear crystal 7 is a 400nm sum frequency crystal. Scheme 1 includes a resonator input mirror 1, a 1064 nm laser medium 2, a Q switch 3, and a resonator intermediate mirror Between 4 and resonant cavity output mirror 8, OPO crystal 5 (1.5μm band laser generation), 532 frequency doubling crystal (1064nm frequency doubling to generate 532nm green light), 400nm sum frequency crystal (532nm and 1.5μm band laser generation and frequency) is placed in sequence. .

[0041] When the OPO crystal 5 is an X-axis cut KTP crystal, the signal light wavelength of the non-critical phase-matched OPO under 1064nm pumping is 1572nm, and the final output blue-violet light wavelength is 397nm. At this time, the 532 frequency doubling crystal can choose (θ=90º, Ф=23.5 º) cut KTP crystal or (θ=90º, Ф=11.3 º) cut LBO crystal. 400nm sum frequency crystal can choose (θ=90º, Ф=33.3º) ...

Embodiment example 2

[0044] Such as image 3 As shown, the first nonlinear crystal 6 is a 0.75 μm band frequency doubling crystal, and the second nonlinear crystal 7 is a 450nm sum frequency crystal. Scheme 2 includes a resonant cavity input mirror 1, a 1064 nm laser medium 2, a Q switch 3, and a resonant cavity Between the middle mirror 4 and the output mirror 8 of the resonator, OPO crystal 5 (1.5 μm band laser generation), 0.75 μm band frequency doubling crystal (1.5 μm band frequency doubling to generate 0.75 μm band laser), 450nm sum frequency crystal (0.75 μm band Generated with 1064nm laser and frequency).

[0045] When the OPO crystal 5 is an X-axis cut KTP crystal, the signal light wavelength of the non-critical phase-matched OPO under 1064nm pumping is 1572nm, and the final output blue-violet light wavelength is 452nm. At this time, the 0.75μm band frequency doubling crystal can choose (θ=90º, Ф=10.5º) cut LBO crystal. The 450nm sum frequency crystal can choose (θ=90º, Ф=21.8º) cut LBO...

Embodiment example 3

[0048] Such as image 3 As shown, the first nonlinear crystal 6 is a 0.6 μm band sum frequency crystal, and the second nonlinear crystal 7 is a 400 nm sum frequency crystal. Scheme 3 includes a resonant cavity input mirror 1, a 1064 nm laser medium 2, a Q switch 3, and a resonant cavity Between the middle mirror 4 and the resonator output mirror 8, OPO crystal 5 (1.5 μm band laser generation), 0.6 μm band sum frequency crystal (1.5 μm band and 1064nm sum frequency to generate 0.6 μm band laser), 400nm sum frequency crystal (0.6 μm band and 1064nm laser generation and frequency).

[0049]When the OPO crystal 5 is an X-axis cut KTP crystal, the signal light wavelength of the non-critical phase-matched OPO under 1064nm pumping is 1572nm, and the final output blue-violet light wavelength is 395nm. At this time, the 0.6μm band and frequency crystal can choose (θ=90º, Ф=20º) cut KTA crystal or (θ=19.7º, Ф=0º) cut LBO crystal. The 400nm sum frequency crystal can choose (θ=90º, Ф=29...

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Abstract

The invention discloses a cascaded nonlinear optical frequency conversion device for realizing 1064nm to 400-450nm blue-violet light, and belongs to the field of laser technologies and nonlinear optical technologies. A 1064nm laser resonant cavity is formed by a resonant cavity input mirror and a resonant cavity output mirror; a resonant cavity intermediate mirror is placed in the 1064nm laser resonant cavity, and a 1064nm laser medium and a Q switch are sequentially placed between the resonant cavity input mirror and the resonant cavity intermediate mirror; nonlinear crystals with different functions are sequentially placed between the resonant cavity intermediate mirror and the resonant cavity output mirror; the 1064nm laser pumping OPO crystal generates 1.5[mu]m waveband laser, and generation of 400-450nm waveband blue-violet laser is further realized through combined design of frequency multiplication and sum frequency of the 1064nm waveband laser and the 1.5[mu]m waveband laser inthe cavity. According to the invention, an intracavity nonlinear optical frequency conversion mode is adopted, and the conversion efficiency of nonlinear optical frequency conversion is improved; andas an OPO crystal, a 1064nm pumping non-critical phase matching structure is realized, and the generation of 1.5[mu]m waveband laser with maximum efficiency is ensured.

Description

technical field [0001] The invention relates to the fields of laser technology and nonlinear optics technology, in particular to a cascaded nonlinear optical frequency conversion device for realizing blue-violet light from 1064nm to 400-450nm. Background technique [0002] Solid-state blue-violet lasers with an output wavelength of 400-450nm can be used in many fields such as biomedicine, laser processing, laser display, and Raman spectroscopy. In the field of laser processing, there is an increasing demand for cutting highly reflective materials such as gold, silver, copper, aluminum and other metals and their alloys. The application scenarios of micromachining have received extensive attention. In the field of biomedicine, drug-resistant bacterial diseases caused by bacterial infections continue to occur. The threat of drug-resistant bacteria to global public health cannot be underestimated. New treatments need to be developed for highly drug-resistant infectious diseases...

Claims

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Application Information

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IPC IPC(8): H01S3/00
CPCH01S3/0092H01S3/0057H01S3/0078H01S3/0085Y02B20/00
Inventor 黄海涛
Owner XUZHOU NORMAL UNIVERSITY
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