Annular integrated laser frequency doubling device

A frequency doubling and ring technology, which is applied in the field of integrated ring laser frequency doubling devices, can solve the problems of limited use and the inability to apply the maximum nonlinear coefficient of crystals, etc., and achieve the effects of stable performance, compact structure, and narrow line width

Inactive Publication Date: 2015-03-25
THE 41ST INST OF CHINA ELECTRONICS TECH GRP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional birefringence phase-matching frequency doubling technology uses the birefringence effect and dispersion characteristics of uniaxial or biaxial crystals to achieve phase matching by selecting the wave vector direction and polarization direction of light waves, thereby obtaining high frequency doubling conversion efficiency. Technology is limited by the material itself, not all crystals can achieve birefringent phase matching, only certain crystals with special structures can achieve birefringent phase matching, and birefringent crystals need to be cut in a special direction, or a specific operating temperature , in addition, the technology cannot apply the maximum nonlinear coefficient of the crystal, which greatly limits the use of the technology

Method used

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  • Annular integrated laser frequency doubling device
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Embodiment 1

[0041] figure 1 It is a structural schematic diagram of the ring frequency doubling cavity of the embodiment of the present invention. Such as figure 1 as shown,

[0042] The integrated ring laser frequency doubling device includes:

[0043] PPKTP (periodically polarized KTP) frequency doubling crystal and ring frequency doubling cavity;

[0044] Wherein, the annular cavity includes plane mirrors M1, M2 and concave mirrors M3, M4; both ends of the PPKTP crystal are coated with anti-reflection coatings for fundamental frequency light and second harmonic.

[0045] Wherein, the plane reflector M1 is a coupling mirror, which is used to receive the fundamental frequency light, so as to realize the coupling of the fundamental frequency light from outside the cavity to the cavity; according to the transmittance of the plane reflector M1, "impedance matching" can be realized .

[0046] Wherein, the plane reflector M2, the concave reflector M3 and the concave reflector M4 have hig...

Embodiment 2

[0059] This embodiment provides a method for generating frequency-doubled light using the above-mentioned device, such as figure 2 As shown, the 1064nm fundamental frequency elliptically polarized light is converted into linearly polarized light by the λ / 4 wave plate and the λ / 2 wave plate to achieve spatial polarization state matching. The matching lens couples the 1064nm fundamental frequency light into the ring frequency doubling cavity to achieve spatial mode matching. The annular cavity is composed of plane mirrors M1, M2 and concave mirrors M3, M4, among which M1 is a coupling mirror, which is used to realize the coupling of the fundamental frequency beam from the outside of the cavity to the inside of the cavity, and its transmittance is specially selected to achieve " impedance matching". The mirrors M2, M3, and M4 have high reflectivity for the fundamental frequency light, and M4 has a high transmittance for the frequency doubled light at the same time, so as to rea...

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Abstract

The invention provides an annular integrated laser frequency doubling device which comprises a periodic poling KTP (PPKTP) frequency doubling crystal and an annular frequency doubling cavity. The annular frequency doubling cavity comprises a plane reflecting mirror M1, a plane reflecting mirror M2, a concave surface reflecting mirror M3 and a concave surface reflecting mirror M4. The two end faces of the PPKTP frequency doubling crystal are each plated with an antireflection film special to fundamental frequency lasers and second harmonics. According to the annular integrated laser frequency doubling device, a frequency stabilized laser of 1064 nm and the PPKTP frequency doubling crystal are used for being combined with a quasi-phase matching and annular outer cavity frequency doubling technology, a stable laser of 1064 nm and a stable laser of 532 nm which have a strict diploid relation in wavelength can be output, the advantages of being good in wave length and power stability, small in line width and the like are achieved, and the wave length linearity of an optical grating spectrograph can be calibrated; a frequency stabilized laser wave length standard device of 1064 nm can be miniaturized, the performance is stable, the structure is compact and the anti-jamming capability is high.

Description

technical field [0001] The invention relates to the technical field of laser frequency doubling, in particular to an integrated ring laser frequency doubling device. Background technique [0002] Commonly used laser output wavelengths are usually near-infrared single-frequency lasers. With the development of science and technology, the demand for lasers in various industries has greatly increased, and higher requirements have been placed on the output wavelength of lasers. It is necessary to extend the output wavelength of lasers to infrared and ultraviolet bands. expand. Laser output wavelengths that cannot be achieved by ordinary lasers can be obtained through nonlinear frequency conversion technology, such as ultraviolet, mid-infrared and far-infrared lasers, among which blue lasers are used in high-density optical data storage, laser medicine, spectroscopy, absorption imaging and laser cooling. Infrared coherent lasers are widely used in spectral research, laser guidanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/109
Inventor 张洪喜郝晓剑朱兴邦
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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