Liquid crystal cell with micro-groove structure and its manufacturing method, and method for controlling laser continuous tuning with voltage changes based on the liquid crystal cell

Abstract

The invention provides a liquid crystal box with a micro groove structure, a manufacture method thereof and a method based on the liquid crystal box and for controlling laser series tuning with voltage change, and relates to a liquid crystal box with a micro groove structure. The invention aims to solve the problem that an existing distributed feedback laser has single wavelength tuning method, and the wavelength can only be adjusted by changing an included angle between the coherent light, resulting in great limitation on the application scope. A laser lithography technology is employed to carve the micro groove structure on each piece of ITO glass, and the micro groove structure is injected with a dye and liquid crystal to form a liquid crystal box containing dye liquid and crystal co-doped structure. A nanosecond laser directly emits a laser beam into the pieces of ITO glass of the liquid crystal box; a square wave voltage signal with frequency of 10kHz is applied between the two pieces of ITO glass of the liquid crystal box; a spectrograph is employed to collect the signal output from the liquid crystal box; and adjustment on the amplitude of the square wave voltage signal can realize adjustment on the wavelength of the laser output by the liquid crystal box. The invention can be applied to various laser systems requiring series tunable wavelength.

Description

technical field [0001] The invention relates to a liquid crystal box with a micro-groove structure, in particular to a liquid crystal box with a micro-groove structure, a manufacturing method thereof and a method for controlling laser continuous tuning with voltage changes based on the liquid crystal box. Background technique [0002] The laser feedback mechanism of distributed feedback occurs in the laser medium with periodic modulation of gain or refractive index. At the same time, only the laser mode whose wavelength satisfies the Bragg resonance condition can be fed back, resonated and amplified when propagating in this structure. Distributed feedback lasers have frequency-selective properties, and can also form wavelength-tunable laser output. The principle of output tunable laser is the output laser wavelength λ when satisfying the Bragg resonance condition j It is proportional to 2nΛ / j, where n is the effective refractive index felt by the laser mode, j is the Bragg ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the existing method of continuous tuning of laser with voltage changes using liquid crystal cells wavelength tuning difference problem, the present invention provides a liquid crystal cell with a micro-groove structure and its manufacturing method and a method for controlling laser continuous tuning with voltage changes based on the liquid crystal cell

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