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External cavity electrically controlled laser wavelength code input method and biwavelength laser module thereof

A technology of laser wavelength and output method, which is applied in the field of nonlinear optics, can solve problems such as changing the laser output wavelength, and achieve high output performance indicators, high structural reliability, and low manufacturing costs.

Inactive Publication Date: 2008-01-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, none of the existing studies and patents involve or imply the method of changing the output wavelength of the laser by switching the polarization state of the output laser

Method used

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  • External cavity electrically controlled laser wavelength code input method and biwavelength laser module thereof
  • External cavity electrically controlled laser wavelength code input method and biwavelength laser module thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The second output wavelength is single-resonant parametric oscillation signal light with type II non-critical phase matching.

[0034] As shown in Figure 2, the present invention adds an electro-optic modulation crystal 2 and a laser nonlinear frequency conversion device 3 on the output optical axis of a common Q-switched polarized pulsed laser near the output mirror. It has no influence on the linear polarization state of the output laser; at this time, the linear polarization direction output by the Q-switched polarized pulse laser 1 is just perpendicular to the polarization direction required by the class II non-critical phase-matched laser nonlinear frequency conversion device 3, and the optical parametric oscillation The device (laser nonlinear frequency conversion device) will not have any influence on its output, and maintains the wavelength output of the front-end Q-switched polarization pulse laser; when the electro-optic modulation crystal (2) app...

Embodiment 2

[0035] Embodiment 2: The second output wavelength is any nonlinear optical conversion wavelength of bidirectional pumping (including frequency doubling wavelength, degenerate or single resonance optical parametric oscillation signal optical wavelength)

[0036] As shown in Figure 3, the difference between it and the single-phase pumping of Embodiment 1 is that a polarization beam splitter 4 is added behind the ordinary Q-switched polarization pulse laser cavity 1 and the electro-optic modulation crystal 2, when the electro-optic modulation crystal 2 does not apply a voltage, It has no effect on the linear polarization state of the output laser; at this time, the linear polarization direction output by the Q-switched polarization pulse laser is just parallel-polarized laser light, and it will completely pass through the polarization beam splitter 4 and dichroic mirror 7 to maintain the front-end Q-switched polarization The wavelength output of the pulsed laser; when the electro-...

Embodiment 3

[0037] Embodiment 3: The second output wavelength is a degenerate type II non-critical phase-matched dual-resonance parametric oscillation light wavelength.

[0038] The output of the degenerate type II non-critical phase-matched double-resonant optical parametric oscillation has two linear polarization directions, so its implementation has its particularity. However, since the output wavelength of the degenerate type II critical phase-matched double-resonant optical parametric oscillator is twice that of the pump light, the 1 / 4 wave plate of the parametric oscillator light is the 1 / 2 wave plate of the pump light . Utilize this characteristic, on the basis of embodiment 1, we add a polarizing beam splitter 4 behind the laser nonlinear frequency conversion device 3 (in this embodiment, a single resonant optical parametric oscillator), two parametric oscillating light A 1 / 4 wave plate (also a 1 / 2 wave plate of pump light) 5 and two total reflection mirrors 6 can be realized. I...

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Abstract

This invention is an output method of coding of external-cavity electric laser wave length and its double wave length laser module, and belongs to the field of non-linear optical laser technology. This invention makes use that the strong selection of the non-linear crystal to the polarization state, uses 1 / 2 wave voltage added on the optical crystal to switch the polarization state of the outputting laser, in order to use the polarization prismatic components to control the transmission direction of the front laser, and make the laser surge of certain polarization direction not pass through non-linear crystal and output the first wave length directly; and make another laser surge of pass through non-linear crystal and output the second wave length. Because the electric and optical crystal can realize high frequency confection, so it can achieve the fast switching speed of the wave length and the switching is very simple. It can precisely assure the laser of two wave lengths to output through the same optical path and easily achieve high output efficiency and realize wave length coding output. The structure of this invention is reliable, and the cost is low.

Description

technical field [0001] The invention relates to an external-cavity electronically controlled laser wavelength coding output method and the dual-wavelength laser device module, belonging to the field of nonlinear optics technology. Background technique [0002] The optical parametric oscillator uses a nonlinear crystal as a working medium and places it in an optical parametric resonant cavity, which is beneficial to the nonlinear effect in the crystal, and converts the linearly polarized pump light energy that meets the matching conditions into parametric oscillation signal light and idler light. , the optical parametric resonant cavity makes the signal light reciprocate to gain gain, and forms a laser output with a specific wavelength; at the same time, the nonlinear crystal has no effect on the linearly polarized pump light that does not meet the matching conditions. [0003] Laser frequency doubling is achieved by using the second harmonic generated by a strong laser throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/10G02F1/03G02F1/37H01S3/00
Inventor 巩马理陈刚闫平柳强
Owner TSINGHUA UNIV