A flexible quantum dot random laser based on PDMS polymers

Abstract

The invention provides a flexible quantum dot random laser based on a PDMS polymer. The flexible quantum dot random laser comprises two PDMS film layers and a permeation layer sandwiched between two PDMS film layers. The concentration of cross-linking agents in the PDMS film layers is larger than 4%. The concentration of a cross-linking agent in the permeation layer is 2% to 4%. The permeation layer is a PDMS film layer with uneven internal stress distribution and is provided with at least one group of linear grooves that diverge from a center point to each direction or at least one group of annular grooves which gradually diffuse from the center point, and quantum dots penetrate the grooves. The quantum dots play roles of gain mediums during a random laser emission process, by using the uneven internal stress distribution of the permeation layer, localized refractive index inconsistency is formed through a photoelastic effect, multiple scattering effects are enhanced, and a purpose ofreducing an existing random laser threshold is achieved. The quantum dots are filled in the permeation layer with low concentration, and the film of the invention has the characteristic of long-termoperation compared with a quantum dot film on the surface of a glass substrate. At the same time, since the PDMS is a flexible material, the PDMS has a flexible characteristic, and the preparation ofthe flexible random laser can be achieved.

Description

technical field [0001] The invention relates to a laser, in particular to a random laser. Background technique [0002] In recent years, random lasers have become a hot research field in the international laser community. There are many significant differences between random lasers and traditional lasers in terms of generation mechanism and luminescence characteristics. Random laser radiation originates from activated disordered media, and provides optical feedback through multiple scattering of radiated light in the media, thereby obtaining greater gain without Additional resonator. Quantum dot random lasers spin-coat quantum dot materials on a glass substrate, use the rough surface of the glass substrate to provide scattering, and emit random laser light, which has the characteristics of low cost and simple preparation process. [0003] Polydimethylsiloxane (PDMS) is an elastic polymer widely used in the fabrication of random lasers due to its simple processing and optic...

AI Technical Summary

Problems solved by technology

However, due to the lack of more feedback mechanisms of this random laser, the output threshold is very high (25mJ / cm 2 ), increasing the loss of pump light

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