Angular spectrum adjustable random laser for high-contrast imaging

A random laser and random laser technology, applied in the field of random laser, can solve problems such as unfavorable full-field imaging, coherent speckle noise, etc., and achieve the effects of flexible coupling mode, suppression of speckle noise, and good robustness

Pending Publication Date: 2022-07-12
BEIJING NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

However, lasers with high spatial coherence will produce coherent speckle noise, which is not conducive to the application of full-field imaging and display

Method used

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  • Angular spectrum adjustable random laser for high-contrast imaging
  • Angular spectrum adjustable random laser for high-contrast imaging
  • Angular spectrum adjustable random laser for high-contrast imaging

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Experimental program
Comparison scheme
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Embodiment Construction

[0030] 1. The preparation process of the device of the present invention (see figure 1 )

[0031] (1) Dissolve 1 mg of PM567 gain dye in 0.2 mL of acetone solution to obtain an acetone solution of PM567.

[0032] (2) Mix 2 mL of PDMS and 0.235 mL of curing agent (mass ratio 10:1) to obtain a PMDS substrate.

[0033] (3) 0.04 mL of silver nanoflower water dispersion with a concentration of 5 mg / mL was mixed with the above-mentioned PDMS substrate and the acetone solution of PM567,

[0034] After stirring well, the mixture was obtained after 1 hour of vacuum.

[0035] (4) Use a micropipette to suck up 1 μL of the mixture and drop it on a laterally placed optical fiber, using surface tension and gravity to form an asymmetric microcavity,

[0036] After drying in an oven at 80 °C for four hours, an asymmetric microcavity directly coupled to the fiber was obtained.

[0037] (5) Drop multiple asymmetric microcavities on different positions of the same fiber, and use pump light t...

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Abstract

The invention provides a random laser with an adjustable angular spectrum for high-contrast imaging. The laser has the advantages of low threshold value, irrelevance between the threshold value and the pumping direction, long storage period, adjustable angular spectrum and the like. The random laser comprises a pump light source, a gain microcavity with random scattering and an optical fiber waveguide. Two or more gain microcavities with random scattering are coupled to different positions on the side face of the optical fiber, the different gain microcavities with random scattering are selectively pumped through the pump light source, the intensity of low-frequency angular spectrum components in a plane is effectively regulated and controlled, and random laser with different angular spectrum distributions is obtained at the fiber end of the optical fiber. When random laser of an annular angular spectrum is used as a light source of a microscope, the imaging contrast ratio of a biological sample is improved, and meanwhile speckle noise is effectively restrained.

Description

technical field [0001] The invention relates to the field of random lasers, in particular to designing a random laser with adjustable angular spectrum for high-contrast imaging. The angular spectrum distribution of the random laser output by the random laser can be regulated by selecting different random microcavities for pumping. Using a random laser with angular spectrum modulation as an illumination light source can improve the contrast of microscopic imaging of biological samples. Background technique [0002] Lasers have the advantages of high brightness, high coherence, high efficiency, and good spectral controllability, and have been widely used in imaging and display fields. However, lasers with high spatial coherence will generate coherent speckle noise, which is not conducive to full-field imaging and display applications. To suppress coherent noise, lasers with low spatial coherence have attracted extensive attention. In particular, random lasers with low spatia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/08H01S3/10H01S3/213H01S3/00B82Y30/00G02B27/48
CPCH01S3/213H01S3/10H01S3/0085H01S3/08G02B27/48B82Y30/00
Inventor 王兆娜沈会会
Owner BEIJING NORMAL UNIVERSITY
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