Tunable liquid crystal laser based on SU8 grating and manufacturing method thereof

Abstract

The invention relates to a tunable liquid crystal laser based on an SU8 grating and a manufacturing method thereof. The tunable liquid crystal laser based on an SU8 grating includes ITO glass substrates, an SU8 grating, a chiral liquid crystal and an AC power supply. The tunable liquid crystal laser based on an SU8 grating is characterized in that a liquid crystal laser component is arranged in the SU8 grating to obtain side radiation which is parallel to the direction of the ITO glass substrates, thus being easy for integration; each channel of the SU8 grating between the two ITO glass substrates is equal to an independent laser resonant cavity, so that the plurality of channels radiates laser at the same time to greatly improve the intensity of the emitted laser; the alternating voltageare applied to upper and lower ITO glass substrate electrodes by the AC power supply, thus forming an electric field perpendicular to the helical axis of the chiral liquid crystal; under the action ofthe electric field, the orientation of the chiral liquid crystal molecules changes, and the screw pitch slowly changes, thus achieving the effect of stable wavelength tuning output; and the method for tuning the output wavelength by means of the electric field is convenient and quick, and can avoid damaging spiral arrangement of the chiral liquid crystal molecules to cause the exiting laser to beturned off. The tunable liquid crystal laser based on an SU8 grating is applied to the fields, such as plane display, optical coding and detection sensing.

Description

Technical field [0001] The invention belongs to the technical field of optoelectronic devices, and specifically relates to a tunable liquid crystal laser based on an SU8 grating and a manufacturing method. Background technique [0002] Liquid crystal lasers have the advantages of no external resonator cavity, small size, low cost, easy availability, simple structure, wide tuning range, etc. However, traditional liquid crystal cell lasers, under the action of external pump light, emit the laser in a direction perpendicular to the direction of the glass substrate. The outgoing laser intensity is weak. The AC voltage is applied from the upper and lower ITO electrodes to form an electric field parallel to the spiral axis. Under the action of the electric field, the spiral arrangement of the liquid crystal molecules is easily destroyed, which causes the outgoing laser to be turned off, which leads to unstable wavelength tuning output. Summary of the invention [0003] In order to achi...

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Problems solved by technology

[0002] Liquid crystal lasers have the advantages of no need for additional resonators, small size, low cost, easy availability, simple structure, and wide tuning range. The output laser intensity is weak

The AC voltage is applied from the upper and lower ITO electrodes to form an electric field parallel to the helical axis. Under the action of the electric field, the helical arrangement of the liquid crystal molecules is easily destroyed, resulting in the shutdown of the outgoing laser, which in turn leads to unstable wavelength tuning output.

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