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Distributed feedback laser containing silver selenide quantum dot and preparation method thereof

A technology of distributed feedback and quantum dots, applied in the structure of the active region, the structure of the optical resonator, etc., can solve the problems of poor photothermal stability of organic polymers, affecting the stability and life of the laser, and achieve high stability. Effect

Inactive Publication Date: 2019-01-04
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Organic polymers have poor photothermal stability, which affects laser stability and lifetime

Method used

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  • Distributed feedback laser containing silver selenide quantum dot and preparation method thereof
  • Distributed feedback laser containing silver selenide quantum dot and preparation method thereof

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Embodiment Construction

[0021] The present invention will be further explained below in conjunction with the drawings.

[0022] Such as figure 2 As shown, the distributed feedback laser containing silver selenide quantum dots of the present invention includes a quartz substrate 2 arranged upward in sequence and a silica periodic grating 3 containing silver selenide quantum dots.

[0023] The silica periodic grating 3 containing silver selenide quantum dots is composed of a silica periodic grating and a silver selenide quantum dot 1 embedded in the silica periodic grating. The silver selenide quantum dots 1 are uniformly distributed in the silica periodic grating. Silver selenide quantum dots 1 such as figure 1 Shown. The silver selenide quantum dot 1 is an optical gain medium, and the lowest quantum state with low toxicity is only the two-fold spin degenerate silver selenide quantum dot 1, which can achieve a low threshold near-infrared light gain. The photothermal stability of silicon dioxide is much...

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Abstract

The invention discloses a distributed feedback laser containing silver selenide quantum dots and a preparation method thereof. The distributed feedback laser comprises a quartz substrate arranged upward in turn and a silicon dioxide periodic grating containing silver selenide quantum dots. The invention utilizes the low toxic lowest quantum state 2-fold degenerate silver selenide quantum dot to replace the lowest quantum state 8-fold degenerate lead salt quantum dot, so as to realize the low threshold near-infrared optical gain. The photothermal stability of silica is much higher than that oforganic polymers. A low threshold, high stability and environment-friendly distributed feedback near-infrared quantum dot laser can be obtained by fabricating periodic grating with silver selenide quantum dot in silicon dioxide film.

Description

Technical field [0001] The invention relates to a distributed feedback laser containing silver selenide quantum dots and a preparation method thereof, and belongs to the technical field of semiconductor optoelectronic devices. Background technique [0002] Near-infrared lasers can be widely used in fields such as optical communications, remote sensing, and coherent plasma generation. Benefiting from the quantum confinement effect, semiconductor quantum dots as optical gain materials exhibit a variety of superior properties, such as tunable emission wavelength with size, potential low laser threshold and temperature-insensitive laser performance. At present, near-infrared quantum dot lasers prepared by molecular beam epitaxy have begun to be used commercially. Compared with epitaxially grown quantum dots, colloidal quantum dots have a smaller size and a more uniform size distribution, so they have a stronger quantum confinement effect and a narrower emission peak. The most commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/12H01S5/30
CPCH01S5/12H01S5/30
Inventor 廖晨
Owner NANJING UNIV OF POSTS & TELECOMM
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