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Application of gallium lanthanum niobate crystals as nonlinear optical devices in the mid-infrared band

A technology of nonlinear optics and gallium lanthanum niobate, which is applied in the field of nonlinear crystal materials and lasers, can solve the problems that second-order nonlinear optics applications have not been paid attention to, and nonlinear optical devices have not been reported, and achieve high resistance to light damage threshold , high-efficiency output range, and the effect of meeting the actual application requirements

Active Publication Date: 2018-06-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although LGN has many advantages above, its application in second-order nonlinear optics has not been paid attention to, and nonlinear optical devices based on this nonlinear crystal material have not been reported.

Method used

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  • Application of gallium lanthanum niobate crystals as nonlinear optical devices in the mid-infrared band
  • Application of gallium lanthanum niobate crystals as nonlinear optical devices in the mid-infrared band
  • Application of gallium lanthanum niobate crystals as nonlinear optical devices in the mid-infrared band

Examples

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Effect test

Embodiment 1

[0054] An optical parametric amplification laser device of gallium lanthanum niobate crystal, the light-transmitting surface of the gallium lanthanum niobate crystal is optically polished, coated or not coated, and if coated, a dielectric film with high transparency to excitation light, signal light and outgoing light is coated The cutting angle of the gallium lanthanum niobate crystal, that is, the angle between the crystal light direction and the optical axis is 51.06-68.3°, preferably, the crystal cutting angle is 53.02°; the range of the mid-infrared laser is 2.2-6.84 μm, preferably , the outgoing mid-infrared laser is 3.55 μm. The crystal length can be 25-200mm, preferably, the crystal length is 72mm.

[0055] The gallium lanthanum niobate crystal optical parametric amplification laser device works as follows figure 1shown. The optical path includes a first excitation source 1 (excitation light), a second excitation source 2 (signal light), a beam splitter 3 , a gallium...

Embodiment 2

[0058] As described in Example 1, the difference is that the second excitation source 2 is a tunable signal light laser of 1.28-1.38 μm. While adjusting the wavelength of the signal light, by changing the crystal cutting angle from 56.56-62.1°, a 4.64- 5.86μm tunable mid-infrared laser output.

Embodiment 3

[0060] An optical parametric oscillator laser of gallium lanthanum niobate crystal, the light-transmitting surface of the gallium lanthanum niobate crystal is optically polished, coated or not coated, and if coated, it is coated with a 1.064 μm laser for an excitation source, a 1.26-2 μm signal light and an idler. Frequency light 2.2-6.84μm high-transparency dielectric film, preferably, plated with a high-transmission dielectric film for 1.34μm and 5.16μm; the cutting angle of the gallium lanthanum niobate crystal is generally 51.06 between the crystal light direction and the optical axis -68.3°, preferably, the crystal cutting angle is 58.72°; the range of the outgoing mid-infrared laser is 2.2-6.84 μm, preferably, the outgoing mid-infrared laser is 5.16 μm. The crystal length is 50-100mm, preferably the crystal length is 78mm.

[0061] The optical parametric oscillator described in this embodiment adopts a two-mirror standing wave cavity structure, which is relatively simple...

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Abstract

The invention relates to an application of a nonlinear optical device with lanthanum gallium niobate crystals as a middle-infrared band. Adopted nonlinear optical crystals are the lanthanum gallium niobate crystals and are cut in the phase matching direction, the frequency of at least one incident laser beam is changed through the second-order nonlinear effect of the lanthanum gallium niobate crystals, at least one laser beam at another specific frequency is generated, and outputting of lasers in the middle-infrared band ranging from 1.6 micrometers to 7.04 micrometers is achieved through nonlinear optical frequency conversion. The invention further provides the middle-infrared-band nonlinear optical device based on the lanthanum gallium niobate crystals. The nonlinear optical device comprises an optical parameter amplifier, an optical parameter oscillator and a difference frequency laser apparatus. The lanthanum gallium niobate crystals have the advantages of wide transmission wave bands, stimulation of a near-infrared band, proper birefringence, the high second-order nonlinear optical coefficient, a high optical-damage-resisting threshold value and the like, and therefore the device can achieve high-energy and high-efficiency outputting of the lasers in the middle-infrared band and has the advantage that an output range can be continuously adjusted.

Description

technical field [0001] The invention relates to the application of a gallium lanthanum niobate crystal as a nonlinear optical device in the mid-infrared band and a mid-infrared nonlinear optical device based on the gallium lanthanum niobate crystal, belonging to the field of nonlinear crystal materials and laser technology. Background technique [0002] The research on the mid-infrared laser band has always been one of the research hotspots in the laser field. Since the 3-5 μm mid-infrared laser is the window band of the atmosphere, it is less affected by the absorption of gas molecules and the scattering of suspended matter. Therefore, it is widely used in spectral measurement, remote sensing, environmental protection and The military has high application value, and 5-8μm is an essential band for trace gas monitoring and molecular spectroscopy applications in the environmental protection field, and signal transmission and reception in the communication field. It is used in m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/355G02F1/39G02F1/35H01S3/10
CPCG02F1/353G02F1/3544G02F1/355G02F1/39G02F1/392H01S3/10007
Inventor 于浩海路大治张怀金王继扬
Owner SHANDONG UNIV
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