Theoretical study of the optical gain characteristics of a Ge1-xSnx alloy for a short-wave infrared laser

doi:10.1088/1674-1056/24/2/024211

Abstract Optical gain characteristics of Ge_1-xSn_x are simulated systematically. With an injection carrier concentration of 5×10¹⁸/cm³ at room temperature, the maximal optical gain of Ge_0.922Sn_0.078 alloy (with n-type doping concentration being 5×10¹⁸/cm³) reaches 500 cm^-1. Moreover, considering the free-carrier absorption effect, we find that there is an optimal injection carrier density to achieve a maximal net optical gain. A double heterostructure Ge_0.554Si_0.289Sn_0.157/Ge_0.922Sn_0.078/Ge_0.554Si_0.289Sn_0.157 short-wave infrared laser diode is designed to achieve a high injection efficiency and low threshold current density. The simulation values of the device threshold current density J_th are 6.47 kA/cm² (temperature: 200 K, and λ =2050 nm), 10.75 kA/cm² (temperature: 200 K, and λ =2000 nm), and 23.12 kA/cm² (temperature: 300 K, and λ =2100 nm), respectively. The results indicate the possibility to obtain a Si-based short-wave infrared Ge_1-xSn_x laser.

Keywords: infrared GeSn alloys semiconductor lasers optoelectronic

Received: 13 July 2014
Revised: 04 September 2014
Accepted manuscript online:

PACS:	42.55.Px	(Semiconductor lasers; laser diodes)
	42.70.Hj	(Laser materials)
	78.40.Fy	(Semiconductors)
	95.85.Jq	(Near infrared (0.75-3 μm))

Fund: Project supported by the Major State Basic Research Development Program of China (Grant No. 2013CB632103), the National High-Technology Research and Development Program of China (Grant No. 2012AA012202), and the National Natural Science Foundation of China (Grant Nos. 61177038 and 61176013).

Corresponding Authors: Cheng Bu-Wen
E-mail: cbw@red.semi.ac.cn

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Zhang Dong-Liang (张东亮), Cheng Bu-Wen (成步文), Xue Chun-Lai (薛春来), Zhang Xu (张旭), Cong Hui (丛慧), Liu Zhi (刘智), Zhang Guang-Ze (张广泽), Wang Qi-Ming (王启明) Theoretical study of the optical gain characteristics of a Ge_1-xSn_x alloy for a short-wave infrared laser 2015 Chin. Phys. B 24 024211

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Theoretical study of the optical gain characteristics of a Ge1-xSnx alloy for a short-wave infrared laser

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Theoretical study of the optical gain characteristics of a Ge_1-xSn_x alloy for a short-wave infrared laser