Method for realizing LiNbO3 crystal domain switching

A technology of domain inversion and crystal, which is applied in the domain inversion field of LiNbO3 crystals, can solve the problems of inability to achieve periodic phase matching of micro-regions and low accuracy, and achieve automatic control, convenient operation and high precision. Effect

Inactive Publication Date: 2005-03-16
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Their disadvantages are that they cannot achieve periodic phase matching of micro-regions, only on the order of microns, and the accuracy is not very high

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  • Method for realizing LiNbO3 crystal domain switching

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Embodiment Construction

[0022] figure 1 It is the present invention that realizes LiNbO 3 Schematic of one of the ultra-intense ultrafast laser systems used in the method of periodic domain inversion in single crystals. The ultra-intensive and ultra-fast laser systems applicable to the present invention are diverse, but they are not the content of the present invention, so please forgive me for not repeating them here. The mechanism of periodic domain inversion using ultra-strong and ultra-fast lasers is as follows: firstly, the titanium sapphire laser with a pulse width of 120 fs, a wavelength of 800 nm, and a frequency of 200 kHz passes through a beam splitter and splits it into two beams, and then uses a 10-fold lens to focus into two beams. 10J / cm 2 The energy density of concentrated light. The width of the interference fringes can be adjusted by the incident angle between the two beams. Polarization of LiNbO by an electric field formed by a strong laser with interference fringes 3 single cr...

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Abstract

It is a method to realize the LiNbO#-[3] crystal domain reverse and the non-linear optics crystal circle domain reverse structure is made by the fringe pattern of two ultra-strong and ultra-quick lasers intervention along the polarization direction 001 of LiNbO#-[3]. The process method of the non-linear optics crystal circle domain structure is the following: first to split the ultra-strong and ultra-quick laser into two beams by use of wave separating; to change the distance between the fringe pattern through adjusting the incidence angle of the laser beam and to find proper circle length. This invention realizes the circle domain reverse under the irradiation of ultra-strong and ultra-quick laser and realizes the domain reverse at nanometer magnitude.

Description

technical field [0001] The present invention relates to LiNbO 3 Crystal domain inversion, especially one that realizes LiNbO 3 Methods of domain inversion in crystals. The periodic domain inversion of this crystal can be used for frequency doubling output of laser. Background technique [0002] In 1962, Bloembergen et al. proposed the theory of quasi phase matching: through the periodic modulation of the nonlinear polarizability of the crystal to compensate for the phase mismatch between the fundamental wave and the harmonic caused by the dispersion of the refractive index, it has been obtained Enhancement of nonlinear optical effects. Replacing homogeneous materials with microstructured materials and using QPM to enhance the laser frequency doubling conversion effect is very attractive in technology. Quasi-phase matching has a number of advantages over birefringent phase matching: [0003] First, since the user controls the periodicity, it can choose a certain period t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35
Inventor 姜本学赵志伟潘守夔徐军
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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