A High Power and Low Polarization Degree 800nm ​​Band Sld Epitaxial Structure

Abstract

The invention provides an 800nm-waveband SLD epitaxial structure high in power and low in polarization degree. The 800nm-waveband SLD epitaxial structure comprises an N-type buffering layer 12, an N-type lower coating 13, a lower gradient layer 14, an active layer 15, an upper gradient layer 16, a P-type upper coating 17 and a P-type contact layer 18 which are sequentially stacked on an N-type substrate 11, and the active layer 15 is made by GaAs(1-x)Px, wherein x refers to a material phosphorous component and is larger than or equal to 0.01 and smaller than or equal to 0.08. In the 800nm-waveband SLD epitaxial structure, GaAsP is adopted to form a well layer of a quantum well structure, dependent variable and light emitting wavelength are adjusted by adjusting components of the well layer, and mode gain of a TE mode and the mode gain of a TM mode are enabled to tend to be uniform, so that requirements on low-polarization-degree light output are met, and the light emitting wavelength is exactly 800nm waveband; by adopting the quantum well structure, output power of an SLD can be increased.

Description

technical field [0001] The invention belongs to the field of SLD (Super Luminescent Diode, super luminescent light emitting diode), and specifically relates to an SLD epitaxial structure capable of realizing the emission wavelength of 800nm ​​band, high output power and low polarization degree. Background technique [0002] The performance of SLD is between that of lasers and light-emitting diodes. It has the advantages of short coherence length, low noise and wide spectrum. It is an ideal light source for fiber optic gyroscopes, wavelength division multiplexing, and coherent tomography. The actual SLD light source emits partially polarized light, most of the power is in the horizontal polarization parallel to the semiconductor junction, and under the same driving current, the polarization degree of the light emitted by the light source will fluctuate with the change of the external environment. In the optical fiber Polarization phase errors can result in gyroscopes. The hi...

AI Technical Summary

Problems solved by technology

In order to improve the output signal-to-noise ratio of the optical detector in the fiber optic gyroscope, the optical power incident on the detector must be increased, and various optical losses in the optical path of the gyroscope can be reduced as much as possible, but this method has a very limited effect. Another One way is to use high power SLD light source

Images