Method for regulating laser emission of gain medium under all-optical control

Abstract

The invention discloses a method for regulating the laser emission of a gain medium under all-optical control, which comprises the following steps of: first irradiating a carrier with random mediums by using infrared light beams with the wavelength of lambda2 or green light beams with the wavelength of lambda3; then emitting pump light (1) with the wavelength of lambda1 from a laser, converging the pump light to form stripes by using a cylindrical lens, making the stripes incident onto the carrier, arranging a detector on the bottom edge of the carrier to receive laser emitted from the carrier, and arranging a device for adjusting the energy of the pump light at the front end of the cylindrical lens; and finally prolonging the irradiation time of the red light beams (5) or improving the irradiation intensity of the red light beams (5) to improve the intensity of stimulated emitted light (7), or prolonging the irradiation time of the green light beams (6) or improving the irradiation intensity of the green light beams (6) to improve the intensity of the stimulated emitted light (7), wherein the random mediums are liquid crystal droplets which are dispersed in the azo dye-containinglaser dye gain medium. The method provided by the invention ensures fixed environmental temperature, fixed electric field, simple structure and convenience of manufacturing at the same time of ensuring that a random laser can dynamically regulate stimulated emission intensity.

Description

technical field [0001] The invention relates to a control method capable of effectively changing the refractive index difference between liquid crystal microdroplets and laser dyes under all-optical control so as to change the laser emission intensity. Background technique [0002] Random lasers have received a lot of attention over the past decade due to their potential applications in photonics and biomedicine. Many disordered materials such as TiO 2 And ZnO powder, polymers, human tissue, dye-doped liquid crystals (DDLCs) and dye-doped polymer dispersed liquid crystals (DDPDLC) can be used to generate random lasers. With or without coherent feedback effects, coherent stochastic stimulated emission can be obtained in extended or localized modes by multiple scattering. Random stimulated emission can be generated when the accumulation of photons in the gain medium over time is sufficient that the amplification of the fluorescence exceeds the optical losses. [0003] In di...

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Problems solved by technology

[0005] Purpose of the invention: the purpose of the present invention is to provide a method for controlling the output laser of the gain medium with all-optical control, aiming at problems such as the difficulty in controlling the characteristics of random stimulated radiation by changing the electric field and temperature, etc., which can be controlled by Illumination effectively adjusts the intensity of random stimulated radiation to achieve dynamic control of stimulated radiation

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