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Method for generating frequency doubling Ince-Gaussian light beam

A beam and frequency doubling technology, applied in the field of nonlinear optical computing holography, can solve the problems of simultaneous frequency conversion, beam shaping and frequency conversion, and high mask cost, so as to achieve low cost of technical implementation and save production The effect of high cost and high yield

Inactive Publication Date: 2018-07-13
NANJING UNIV
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Problems solved by technology

There are also many ways to generate IG beams, for example, using a spatial light modulator, but this method can only realize the generation of IG beams, and cannot realize frequency conversion at the same time
It is also feasible to generate IG beams through the preparation of masks, but each mask can only generate one mode of IG beams, and the cost of preparing masks is also high, and this process cannot simultaneously achieve beam shaping and frequency converted

Method used

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Embodiment Construction

[0031] Based on the existing theory of nonlinear optical computational holography, a hologram carrying the light field distribution of the IG beam was designed by MATLAB programming, such as figure 1 shown. The holograms were transferred into LN crystal thin films by means of maskless lithography and probe pressing. The fundamental Gaussian beam pumped by the Ti:sapphire femtosecond pulsed laser is vertically incident on the surface of the domain-structured LN crystal thin film, and a frequency-doubled IG beam is generated at the far-field first-order diffraction. This method can convert ordinary Gaussian beams into IG beams, and at the same time realize frequency conversion, which has the advantage of integration.

[0032] The specific steps for the preparation of the domain structure of the LN crystal thin film:

[0033] 1) Determine the +C surface of the LN crystal film by means of the probe pressing and scribing, apply a pulse voltage greater than the coercive field of t...

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Abstract

Disclosed is a method for generating a frequency doubling Ince-Gaussian light beam. Based on a nonlinear optical calculation holographic theory, phase and amplitude information of an IG light beam areintroduced to a hologram definition equation, and a hologram carrying IG light beam optical filed distribution is made by MATLAB programming; by adopting a mask-free photoetching method, the hologramis transferred to an LN crystal thin film to prepare a hologram domain structure in the LN crystal thin film; the surface of the LN crystal thin film is plated with a layer of metal Cr by adopting anelectron beam evaporation method, and then stripping is performed to form a patterned electrode needed by polarization; preparation of the domain structure is realized by adopting a probe pressurizing method; and femtosecond laser is pumped to the domain structured LN crystal thin film to generate the frequency doubling light beam in first-order diffraction position of a far field. By virtue of the method, processes of light beam shaping and frequency conversion are realized synchronously, and advantage of integration is realized.

Description

technical field [0001] The invention relates to the theory of nonlinear optical computational holography, a preparation method for the domain structure of LN crystal thin film, and an experimental device for generating frequency-doubling IG beams. The specific process is: design a hologram capable of generating IG beams based on nonlinear optical computational holography theory, prepare the domain structure of the hologram in the LN crystal film by means of probe pressure, and pump the femtosecond laser to the domain In the structured LN crystal thin film, a frequency-doubled IG beam is generated at the far-field first-order diffraction. Background technique [0002] It is well known that the Hermite-Gaussian (HG) mode and the Laguerre-Gaussian (LG) mode are the exact orthogonal solutions of the free-space paraxial wave equation (PWE) in Cartesian and cylindrical coordinates, respectively. In 2004, Bandres et al. derived the exact orthogonal solution of PWE in the elliptic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/109
CPCH01S3/109
Inventor 崔国新王梦莹唐杰陆延青
Owner NANJING UNIV
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