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A passive Q-switched pulsed self-frequency doubling green laser

A self-frequency doubling and laser technology, applied in the laser field, can solve the problems of undiscovered pulse self-frequency doubling materials, difficult and high optical quality NYAB, inability to achieve passive Q-switched output, etc., and achieves high resistance to light damage threshold, compact structure, The effect of high peak power

Active Publication Date: 2018-07-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the self-frequency doubling crystals that people have discovered are Nd:MgO:LiNbO 3 , Nd:YCOB, Nd:GdCOB, NYAB, etc. Although these materials have achieved good results in continuous self-frequency multiplication output, these crystals have different significant defects for pulsed self-frequency multiplication output with high peak power. Such as Nd:MgO:LiNbO 3 The anti-photodamage threshold of Nd:YCOB and Nd:GdCOB is low and has a photorefractive effect, and the laser stimulated emission cross-section of Nd:YCOB is small, and passive Q-switching output cannot be realized, while NYAB contains YAB[YAl(BO 3 ) 4 ] and NAB[NdAl(BO 3 ) 4 ] with two lattice structures, poor optical uniformity, and it is difficult to obtain high optical quality NYAB
Therefore, people have not yet found a pulse self-frequency doubling material with real practical value, especially for the case of semiconductor laser pumping.

Method used

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  • A passive Q-switched pulsed self-frequency doubling green laser
  • A passive Q-switched pulsed self-frequency doubling green laser
  • A passive Q-switched pulsed self-frequency doubling green laser

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A passively Q-switched pulsed self-frequency doubling green laser, including a semiconductor laser pump source, a resonator incident mirror, a saturable absorber, a self-frequency doubling laser crystal, and a resonator output mirror sequentially placed along the optical path. The self-frequency doubling laser crystal is Nd:CNGS crystal, the cutting direction of the Nd:CNGS crystal is along the 1064nm frequency doubling phase matching direction, and the Nd ion doping concentration of the Nd:CNGS crystal is 0.5 at.%.

[0041] The cutting angle of the class I phase matching of the Nd:CNGS crystal is (θ, φ), wherein the value of θ is 36.6°, the value of φ is 30.0°, and the class II phase matching of the Nd:CNGS crystal The cutting angle of is (θ1, φ1), where the value of θ1 is 56.5°, and the value of φ1 is 0°.

[0042] The semiconductor laser pumping source is a direct output semiconductor laser with a center wavelength of 808nm.

[0043] The incident mirror of the resona...

Embodiment 2

[0048] A kind of passive Q-switched pulsed self-frequency doubling green laser according to embodiment 1, the difference is that the self-frequency doubling laser crystal is Nd:CTGS crystal, and the length of the Nd:CTGS crystal in the direction of light transmission The cutting direction of the Nd:CTGS crystal is along the 1064nm frequency doubling phase matching direction, and the doping concentration of neodymium ions in the Nd:CTGS crystal is 0.5 at.%.

[0049] The cutting angle of the type I phase matching of the Nd:CTGS crystal is (θ2, φ2), wherein the value of θ2 is 38.7°, the value range of φ2 is 30.0°, and the type II phase of the Nd:CTGS crystal The matching cutting angle is (θ3, φ3), where the value range of θ3 is 61.1°, and the value range of φ3 is 0°.

Embodiment 3

[0051] According to a passive Q-switched pulsed self-frequency doubling green laser according to Embodiment 1 or 2, the difference is that the passive Q-switched pulsed self-frequency doubling green laser also includes a focusing system, and the focusing The system is placed between the semiconductor laser pump source LD and the incident mirror of the resonant cavity, and the self-frequency doubling laser crystal is placed on the focal length of the focusing system.

[0052] The incident mirror of the resonant cavity is placed independently of the saturable absorbing sheet, and the incident mirror of the resonant cavity is coated with a dielectric film that is highly transparent to 808nm light and highly reflective to 1064nm light and 532nm light. Both ends of the saturable absorbing sheet are coated with 808nm and 1064nm anti-reflection coatings.

[0053] The output mirror of the resonant cavity is placed independently of the self-frequency doubling laser crystal, and the out...

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Abstract

The invention relates to a passive Q-switched pulsed self-frequency doubling green laser, which comprises a semiconductor laser pump source, a resonant cavity incident mirror, a saturable absorber, a self-frequency doubling laser crystal and a resonant cavity output mirror arranged along the optical path in sequence. , the self-frequency doubling laser crystal is Nd:CNGS crystal or Nd:CTGS crystal, the length of the Nd:CNGS crystal or Nd:CTGS crystal in the light direction is (0.1‑100)mm, and the cutting direction is along the 1064nm frequency doubling phase matching direction , the doping concentration of neodymium ions is (0.1–30) at.%. These two crystals have laser emission and nonlinear optical effects at the same time, and the stimulated emission cross section is moderate. In the present invention, a self-frequency doubling laser crystal is used to replace two crystals, the laser crystal and the nonlinear crystal, and the laser produced is smaller in size and more structured. Compact, the production cost is greatly reduced, and at the same time, the processing and assembly links are simplified, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a passive Q-switched pulsed self-frequency doubling green laser, which belongs to the field of laser technology. Background technique [0002] Passive Q-switching is an important technology to obtain laser pulses with large energy, narrow pulse width and high peak power. LD-pumped passively Q-switched green lasers have important applications in nonlinear optics, microsurgery, contamination detection, and ion spectroscopy. At present, the common way for people to obtain this type of light source is to first use laser crystals to generate near-infrared solid-state lasers (such as 1064nm), then use saturable absorbers to realize passive Q-switched pulse laser operation, and then use nonlinear optical crystals to achieve frequency doubling in the cavity. , external cavity frequency doubling or composite cavity frequency doubling to achieve pulsed green light output. This kind of laser involves many optical elements, complex struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/11H01S3/109
Inventor 王正平
Owner SHANDONG UNIV