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Multiplier enhancing method based on periodically poled lithium niobate

A periodic polarization and lithium niobate technology, which is applied in the field of optical information processing, can solve the problems of non-adjustable wavelength and complex structure of frequency-doubled light, achieve high conversion efficiency and realize the effect of simple structure

Inactive Publication Date: 2014-02-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the defect of this technology is that its structure is complex, and it must be realized through two PPLN chips.
And only 0-type frequency doubling can be achieved, because the 0-type frequency doubling bandwidth is narrow and the pump wavelength is fixed, so the wavelength of the frequency doubling light cannot be adjusted, which is difficult to meet the existing industrial needs

Method used

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  • Multiplier enhancing method based on periodically poled lithium niobate
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  • Multiplier enhancing method based on periodically poled lithium niobate

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Embodiment 1

[0030] Combine below figure 1 with figure 2 The embodiments of the present invention will be described in detail.

[0031] 1) Select a piece of 5% mol magnesium-doped Z-cut lithium niobate crystal with a size of 30×10×0.5mm and a thickness of 0.5mm. The + / -Z of the crystal is polished, where the +Z plane is parallel to the horizontal plane and faces the positive direction of the Z axis, and the -Z plane is parallel to the horizontal plane and faces the negative direction of the Z axis.

[0032] 2) Use Matlab software to simulate the period Λ required to meet the quasi-phase matching condition: Λ 1 = λ 2 ( n z 2 ω - n y ω ) , Λ 2 = λ 2 ( n y ω - n z ω ) , Among them: the range of λ is 1518-1627nm, and the refractive index can be calculated by Sellmeier equation.

[0033] Obtained that when the temperature of the wafer is 15.15℃, the E light can be doubled at the center of the O light broadban...

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Abstract

The invention provides a multiplier enhancing method based on periodically poled lithium niobate, and belongs to the technical field of optical information processing. The method includes firstly, performing room temperature electric field polarization on lithium niobate crystals, changing the polarization direction of the electric domain in a negative domain region of the +Z face of the crystals, and performing vacuum coating sputter electrode on two Y-directional sides of the crystals; then irradiated the crystals with a normal light and applying voltage of the two Y-directional sides of the lithium niobate crystals through a high voltage source simultaneously, and realizing ordinary light multiplier enhancement through produced slow light effects. According to the method, the quasi-phase matching technique (QPM) is creatively combined with effective light power enhancement resulted from the slow light effects.

Description

Technical field [0001] The invention relates to a method in the technical field of optical information processing, in particular to a method for enhancing frequency multiplication based on periodically polarized lithium niobate. Background technique [0002] Since the birth of laser technology, nonlinear frequency conversion technology and slow light technology have always been research hotspots. Quasi-phase matching technology (QPM) based on periodic polarization nonlinear crystals is one of the most effective and commonly used methods to broaden the tunable wavelength of lasers. Commonly used periodic polarization nonlinear crystals are: LiNbO 3 (PPLN), LiTaO 3 And KTP etc. Quasi-phase matching technology is to artificially prepare periodic polarization reversal gratings in a nonlinear crystal, and periodically modulate the nonlinear coefficients of the crystal to meet the conditions of phase matching. Among frequency conversion technologies, SHG technology is the most widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/37
Inventor 陈玉萍李广珍唐喻斌张晋平蒋淏苇陈险峰
Owner SHANGHAI JIAO TONG UNIV
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