Crystal material, as well as preparation method and application thereof to nonlinear optical crystal

A technology of nonlinear optics and crystal materials, applied in nonlinear optics, polycrystalline material growth, optics, etc., can solve the problem of not meeting the requirements of high-power nonlinear optics crystal materials, not easy to grow large crystals with optical quality, and laser damage threshold Low-level problems, to achieve the effect of excellent infrared nonlinear optical performance, excellent infrared nonlinear optical performance, and simple steps

Pending Publication Date: 2017-05-31
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing materials used in the mid-to-far infrared band mainly include AgGaS 2 , AgGaSe 2 and ZnGeP 2 etc. These materials have played a key role in high-tech fields and military equipment, but these crystals are synthesized under harsh conditions, and it is not easy to grow large crystals with high optical quality, especially because the laser damage threshold is low, so they cannot meet high-power non-conductive applications. Linear Optics Crystal Material Requirements

Method used

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  • Crystal material, as well as preparation method and application thereof to nonlinear optical crystal
  • Crystal material, as well as preparation method and application thereof to nonlinear optical crystal
  • Crystal material, as well as preparation method and application thereof to nonlinear optical crystal

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Experimental program
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Effect test

Embodiment 1

[0045] The preparation of embodiment 1 crystal sample

[0046] sample 1 # (Na 2 Ga 2 GeS 6 ) preparation

[0047] Na 2 S (0.052g), Ga (0.0929g 13.33), Ge (0.0483g 6.65), and S (0.1068g) ingredients and mix evenly, put into the quartz tube, vacuum to 10 -4 Torr (1 torr = 133.322 Pa) seal the tube, put it into the muffle furnace and slowly heat it to 700°C, keep it warm for 96 hours, cool down to 300°C after 4°C / h, turn off the muffle furnace and cool it down to room temperature naturally, and get The chemical formula is Na 2 Ga 2 GeS 6 of yellow crystals, denoted as sample 1 # .

[0048] sample 2 # (Na 2 Ga 2 GeSSe 5 ) preparation

[0049] Na 2 After S (0.0342g), Ga (0.0611g), Ge (0.0318g), and Se (0.1729g) are mixed evenly, they are put into a graphite crucible, put into a quartz tube, and evacuated to 10 -4 Torr seals the tube, puts it into the muffle furnace and slowly heats it to 800°C. After 72 hours of heat preservation, it cools down to 300°C ...

Embodiment 2

[0058] The structural characterization of embodiment 2 sample

[0059] sample 1 # ~6 # The X-ray powder diffraction phase analysis (XRD) was carried out on the MiniFlex II X-ray diffractometer of Rigaku Company, Cu target, Kα radiation source (λ=0.154184nm).

[0060] sample 1 # ~6 # The X-ray single crystal diffraction was carried out on a Rigaku Pilatus type single crystal diffractometer, Mo target, Kα radiation source (λ=0.07107nm), test temperature 293K. And through the structure analysis of Shelxtl97, the analysis result is:

[0061] sample 1 # The crystallographic data for:

[0062] The chemical formula is Na 2 Ga 2 GeS 6 , belonging to the Fdd2 space group of the orthorhombic crystal system, α=90°, β=90°, γ=90°, Z=8.

[0063] Na 2 Ga 2 GeS 6 The unit cell contains 2 Na atoms, 2 Ga atoms, 1 Ge atom and 6 S atoms, and its three-dimensional crystal structure is mainly composed of one-dimensional 1 ∞ [Ga 2 GeS 6 ] 2- The chains are composed of Na atom...

Embodiment 3

[0075] The frequency doubling test of embodiment 3 sample

[0076] sample 1 # ~6 # The specific steps of the frequency doubling experiment are as follows: use the laser with a wavelength of 2.05 μm generated by OPO technology as the fundamental frequency light, irradiate the crystal powder to be tested, and use the charge-coupled device (CCD) to detect the intensity of the second harmonic of 1025 nm generated. The sample to be tested and the standard sample AgGaS 2 Grind separately, and use a standard sieve to sieve crystals of different particle sizes, the particle sizes are 30-50 μm, 50-75 μm, 75-100 μm, 100-125 μm, 125-150 μm and 150-200 μm. Record the change trend of the frequency multiplier signal with the particle size, and judge whether it can achieve phase matching. Under the same conditions, compare sample 1 # ~6# The intensity of the generated second harmonic is comparable to that of the reference crystal AgGaS 2 The intensity of the generated second harmonic, so...

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Abstract

The invention discloses a crystal material, as well as a preparation method and application thereof to a nonlinear optical crystal. The chemical formula of the crystal material is Na2Ga2MQ6, where M represents Ge and/or Sn, and Q represents S and/or Se. The crystal material can be prepared by adopting a high temperature solid state method. The crystal material has high infrared nonlinear optical performance, a nonlinear effect capable of reaching 1.5 times of that of commercial AgGaS2 and a laser damage threshold value capable of reaching 81.5 times of that of the commercial AgGaS2 (which can be abbreviated as AGS). The crystal material has high application value in terms of frequency converters of mid-far infrared band laser frequency multiplication, sum frequency generation, difference frequency generation, optical parametric oscillation and the like.

Description

technical field [0001] The application relates to a crystal material, a preparation method and an application in nonlinear optical crystals, belonging to the field of nonlinear optical materials. Background technique [0002] Infrared nonlinear optical materials have broad application prospects in military, scientific research, and medical treatment, such as molecular spectroscopy, photoelectric countermeasures, non-invasive medical testing, environmental monitoring, deep space exploration, space telescopes, infrared laser radar, laser communication, etc. [0003] At present, the mid-to-far infrared lasers of 2-20 microns are mainly obtained based on the principle of nonlinear optics and infrared nonlinear optical frequency conversion technology. The existing materials used in the mid-to-far infrared band mainly include AgGaS 2 , AgGaSe 2 and ZnGeP 2 etc. These materials have played a key role in high-tech fields and military equipment, but these crystals are synthesized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B1/10G02F1/355
CPCC30B1/10C30B29/46G02F1/3551
Inventor 李淑芳郭国聪姜小明徐忠宁刘彬文
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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