Cross and superposition type laser crystal frequency multiplier

A laser crystal and frequency multiplier technology, applied in the field of laser frequency conversion, can solve the problems of affecting the beam quality of the frequency doubling conversion efficiency, limiting the effective length of the action, etc.

Inactive Publication Date: 2005-06-01
青岛海泰光电技术有限公司
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Problems solved by technology

This effect is the discrete phenomenon between the fundamental wave light and the frequency-doubled light caused by the birefringence of the crystal itself. It not only limits the effective length of action in the crystal, but also seriously affects the conversion efficiency of frequency doubled and the output of harmonics. beam quality

Method used

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  • Cross and superposition type laser crystal frequency multiplier
  • Cross and superposition type laser crystal frequency multiplier
  • Cross and superposition type laser crystal frequency multiplier

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 A cross-superimposed nonlinear crystal frequency multiplier is made with BBO crystals, and the frequency doubled 940nm LD laser beam with large divergence achieves blue light output.

[0036] A typical inorganic nonlinear crystal with relatively large birefringence—BBO crystal is selected as an example, and a cross-stacked laser crystal frequency doubler in a frequency-converting laser is fabricated in the form of type I phase matching. Having determined the specific wavelength and matching type, we calculate that the crystal's effective frequency doubling coefficient d eff =1.42(pm / V), allowable angular width δθ=0.778(mrad-cm), allowable wavelength bandwidth δλ=0.5935(nm-cm), discrete angle ρ=3.417(deg.), and phase matching angle is θ=25.1 (deg.), φ = 0 (deg.). According to the calculation results, 4 pieces of BBO crystal slices are oriented, cut, ground, shaped, and polished (the size of the crystal slice is 5×5×3mm), and after the moisture-proof protect...

Embodiment 2

[0038] Embodiment 2 The newly grown new nonlinear crystal GAB crystal is selected to make a cross-superimposed nonlinear crystal frequency multiplier, and the frequency multiplication is achieved by the 940nm LD laser beam coupled by an optical fiber to achieve blue light output. The LD light source used is the same as that in Embodiment 1.

[0039] GAB crystal is a new frequency doubling crystal material. When the present invention is implemented, there is no block size crystal that can be used to make devices in the past. Therefore, two crystal sheets are processed respectively with the small-size crystal sheet of this crystal (only during processing) It is necessary to remember the orientation of a certain characteristic growth edge, and then you can grasp their relative orientation relationship when combining them into devices), and then use these two crystal slices to combine into a cross-superimposed nonlinear crystal frequency multiplier. The crystal belongs to uniaxial...

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Abstract

The crossed superposed laser crystal frequency doubler used in laser frequency varying technological consists of several identical frequency-doubling crystal slices meeting the phase matching condition and superposed in certain angle. The crossed superposed laser crystal frequency doubler has compact and simple structure, convenient use and low cost. It may be used in frequency doubling of laser beam with great divergency to raise frequency doubling output efficiency, improve the laser beam quality of the frequency doubling output spot and compensate the scattering effect of laser in non-linear crystal. It may have new application in non-linear crystal with great birefringence and is especially suitable for frequency varying of semiconductor laser LD and strong focused output laser with non-linear optical crystal.

Description

technical field [0001] The invention relates to the technical field of laser frequency conversion. technical background [0002] As we all know, laser frequency conversion is an important field in laser technology. Nonlinear optical crystal frequency conversion (frequency doubling, sum frequency, difference frequency, optical parameter oscillation and amplification, etc.) is the most important and widely used laser frequency conversion technology in laser technology. [0003] In the process of realizing laser frequency conversion through the nonlinear optical effect of nonlinear optical crystals, the effect of frequency conversion (efficiency, beam quality, etc.) is deeply affected by two factors: laser beam quality and inherent characteristics of nonlinear crystals. In order to overcome these influences, some technical means have been adopted for various specific situations in the past. The present invention proposes and implements a brand-new nonlinear crystal frequency ...

Claims

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Application Information

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IPC IPC(8): H01S3/109
Inventor 吴柏昌涂朝阳黄燕朱昭捷李坚富
Owner 青岛海泰光电技术有限公司
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