Waveguide-assisted random scattering feedback random laser
A random laser and random laser technology, applied in the field of lasers, can solve the problems of unfavorable random laser time series regulation time domain regulation, etc., and achieve the effect of flexible regulation mode
Active Publication Date: 2020-04-28
BEIJING NORMAL UNIVERSITY
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However, the above-mentioned scattering system is in direct contact with the gain material, and the scattering material may have an irreversible impact on the luminescent properties of the gain material, which has certain limitations; at the same time, the relatively fixed scattering system is not conducive to the realization of random laser time-sequence regulation and control. Time Domain Manipulation of Spectrum
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[0029] 1. The device of the present invention realizes the dynamic regulation and control schematic diagram of the liquid random laser and the corresponding output characterization (see Figure 1-3 )
[0030] (1) Dilute 4.4mg R6g gain dye in 20mL aqueous solution to prepare 0.22mg / mL R6g aqueous solution, take 2mL of this solution and put it in a quartz cuvette with an external dimension of 22.5*12.5*45mm;
[0031] (2) Cut out a glass sheet whose length and width are 50*10mm respectively, and perform local damage treatment on its edge to make it carry random scattering;
[0032] (3) Control method one ( figure 1 ): Paste the glass sheet in (2) on the inner side of the wall of the quartz cuvette in (1) with a width of 12.5 mm, and vertically pump the R6g aqueous solution in the quartz cuvette with a 532nm pulsed laser with a pulse width of 8 ns. A random laser output with a central wavelength of about 592nm (solid line) is realized; when the glass sheet is removed, the random...
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Abstract
A waveguide structure assisted random scattering feedback random laser provided by the invention has the characteristic that the output time sequence can be dynamically regulated and controlled, and has the advantages of simple and flexible regulation and control mode, high universality and the like. The random laser comprises a pump light source, a gain medium module and a waveguide structure with random scattering. A gain medium solution with a certain concentration is filled in a quartz cuvette or is made into a gain medium film structure to form a gain medium module; pulse laser is used for pumping the gain medium module, a waveguide structure with random scattering and the gain medium module are controlled to be pasted and separated, part of pumping pulse can be flexibly selected to be converted into random laser, and regulation and control over the output random laser time sequence are achieved.
Description
technical field [0001] The invention relates to the field of lasers, in particular a waveguide structure-assisted random scattering feedback random laser is designed, and the time pulse sequence of the random laser can be mechanically regulated. Background technique [0002] Random lasers are a class of lasers based on random feedback, which use the multiple scattering of light in random media to provide optical feedback to achieve stimulated emission amplification. Unlike traditional lasers, random lasers do not require an external resonator, and have the advantages of simple fabrication, low cost, and low spatial coherence. They have broad applications in many fields such as speckle-free imaging, optical sensing, security and anti-counterfeiting, and nano-optoelectronic devices prospect. At present, more and more people have paid more and more attention to the control of random lasers, mainly focusing on the spectral control characteristics of random lasers, and the main ...
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Patent Timeline
Login to View More IPC IPC(8): H01S3/30H01S3/20H01S3/094
CPCH01S3/094061H01S3/20H01S3/307
Inventor 王兆娜卞耀兴
Owner BEIJING NORMAL UNIVERSITY