Experimental Investigation on the Mode Characteristics of an Excited-State Quantum Dot Laser under Concave Mirror Optical Feedback

Yanfei Zheng; Guangqiong Xia; Xiaodong Lin; Qingqing Wang; Hongpei Wang; Cheng Jiang; Hongmei Chen; Zhengmao Wu

doi:10.3390/photonics10020166

Photonics (Feb 2023)

Experimental Investigation on the Mode Characteristics of an Excited-State Quantum Dot Laser under Concave Mirror Optical Feedback

Yanfei Zheng,
Guangqiong Xia,
Xiaodong Lin,
Qingqing Wang,
Hongpei Wang,
Cheng Jiang,
Hongmei Chen,
Zhengmao Wu

Affiliations

Yanfei Zheng: School of Physical Science and Technology, Southwest University, Chongqing 400715, China
Guangqiong Xia: School of Physical Science and Technology, Southwest University, Chongqing 400715, China
Xiaodong Lin: School of Physical Science and Technology, Southwest University, Chongqing 400715, China
Qingqing Wang: School of Physical Science and Technology, Southwest University, Chongqing 400715, China
Hongpei Wang: School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, China
Cheng Jiang: School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, China
Hongmei Chen: School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, China
Zhengmao Wu: School of Physical Science and Technology, Southwest University, Chongqing 400715, China

DOI: https://doi.org/10.3390/photonics10020166
Journal volume & issue: Vol. 10, no. 2
p. 166

Abstract

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In this paper, we experimentally investigated the mode configuration of an excited-state quantum dot laser (ESQDL) under concave mirror optical feedback, and the influences of the feedback strength on the mode characteristics were analyzed. The results showed that after introducing concave mirror optical feedback, some longitudinal modes of the excited-state (ES) existing in a free-running ESQDL could be suppressed. When the feedback strength increased to a certain extent, the ground-state (GS) emission occurred and co-existed with the ES emission. By further increasing the feedback strength, all the longitudinal modes of the ES emission were suppressed, and only the longitudinal modes of the GS emission could be observed. As a result, the emission-state switching from the ES to GS emission was realized. When the ESQDL was biased at a larger current, the feedback strength required to achieve emission-state switching was stronger.

Published in Photonics

ISSN: 2304-6732 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: http://www.mdpi.com/journal/photonics

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