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Polarization-independent quasi-phase-matching frequency multiplier and manufacturing method thereof

A production method and matching technology, applied in the direction of instruments, lasers, phonon exciters, etc., can solve the problem of dependence on the polarization state of fundamental frequency light, and achieve the effect of improving stability and overcoming dependence

Inactive Publication Date: 2013-12-11
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

So far, quasi-phase matching frequency multiplication still has the disadvantage of dependence on the polarization state of fundamental frequency light

Method used

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  • Polarization-independent quasi-phase-matching frequency multiplier and manufacturing method thereof
  • Polarization-independent quasi-phase-matching frequency multiplier and manufacturing method thereof
  • Polarization-independent quasi-phase-matching frequency multiplier and manufacturing method thereof

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Embodiment Construction

[0035] According to the design, a depolarizer and two identical PPLN crystals are used, and their c axes are along the z direction and the y direction respectively. A fiber laser is selected as the light source for pumping the fundamental frequency light, and the output laser with a changed polarization state is incident along the x direction. After passing through the depolarizer, the polarization degree of the fundamental frequency light can be reduced to 1% (the polarization degree of natural light is 0). At this time, the intensity of the z-direction polarization component of the fundamental frequency light is approximately equal to the intensity of the y-direction polarization component. Then the z-polarized light undergoes EEE-type frequency doubling in the first PPLN, and the y-polarized light also undergoes EEE-type frequency doubling in the second PPLN. The effective lengths of the two nonlinear processes are equal, so The linear coefficients are equal and are the lar...

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Abstract

The invention discloses an implementing scheme of a polarization-independent quasi-phase-matching frequency multiplier. The implementing scheme comprises the following steps of: according to quasi-phase-matching conditions at room temperature, calculating a period; according to the period, selecting two same crystals to carry out room temperature polarization; pumping a fundamental frequency light source to select an optical fiber laser of which emergent light is randomly polarized; in an optical path, ensuring a c-axis of a first crystal along a z-direction, ensuring a c-axis of a second crystal along a y-direction and placing a depolarizer in front of the first crystal; and after the light passes through the frequency multiplier, measuring the light intensity of the frequency multiplier by a power meter, so that the polarization-independent quasi-phase-matching frequency multiplier can be implemented. The polarization-independent quasi-phase-matching frequency multiplier is simple and practicable. The defect of dependence of the frequency multiplying process on the polarization direction of the fundamental frequency light can be overcome. Meanwhile, the polarization-independent quasi-phase-matching frequency multiplier can be suitable for other nonlinear processes such as sum frequency, difference frequency, parametric oscillation, cascading and the like.

Description

technical field [0001] The invention relates to a laser frequency doubling device, in particular to a polarization-independent quasi-phase matching frequency multiplier and a manufacturing method thereof. Background technique [0002] Since the birth of the laser, the nonlinear frequency conversion technology of the laser has been a research hotspot. The quasi-phase matching technology based on the periodically polarized nonlinear crystal is one of the most common and effective methods to broaden the tunable wavelength of the laser. Commonly used periodically polarized nonlinear crystals are: LiNbO 3 (PPLN), LiTaO 3 (PPLT), and KTP (PPKTP), etc. In the frequency conversion technology, the frequency multiplication (SHG) technology is the most widely used, and it is also a research hotspot. The existing quasi-phase matching frequency doubling technology requires the incident fundamental frequency light to be linearly polarized in a certain polarization direction. This is be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/37H01S3/109
Inventor 石剑虹袁亮郑远林陈险峰王杰
Owner SHANGHAI JIAOTONG UNIV
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