Terahertz quantum cascade lasers with sampled lateral gratings for single mode operation

doi:10.1007/s12200-020-1083-2

Front. Optoelectron.

2021, Vol. 14

Issue (1) : 94-98 https://doi.org/10.1007/s12200-020-1083-2

RESEARCH ARTICLE

Terahertz quantum cascade lasers with sampled lateral gratings for single mode operation

Dixiang SHAO, Chen YAO, Zhanglong FU, Wenjian WAN, Ziping LI, Juncheng CAO(

)

Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

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Abstract

In this paper, we presented single mode terahertz quantum cascade lasers (THz QCLs) with sampled lateral grating emitting approximately 3.4 THz. Due to strong mode selection, the implementation of sampled lateral grating on THz QCL ridges can result in stable single longitudinal mode emission with a side-mode suppression ratio larger than 20 dB. The measured peak power of the grating laser is improved by about 11.8% compared to the power of devices with uniform distributed feedback gratings. Furthermore, the far-field pattern of the presented device is uninfluenced by grating structures.

Keywords terahertz (THz) quantum cascade laser (QCL) sampled lateral grating

Corresponding Author(s): Juncheng CAO

Just Accepted Date: 16 October 2020 Online First Date: 19 November 2020 Issue Date: 19 April 2021

Cite this article:

Dixiang SHAO,Chen YAO,Zhanglong FU, et al. Terahertz quantum cascade lasers with sampled lateral gratings for single mode operation[J]. Front. Optoelectron., 2021, 14(1): 94-98.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-020-1083-2
https://academic.hep.com.cn/foe/EN/Y2021/V14/I1/94

Fig.1 (a) Schematic diagram of sampled lateral grating THz QCLs. (b) Computed two-dimensional fundamental mode profile of 120 μm-wide waveguide. (c) Top view of the fabricated device

Fig.2 (a) Power-current (P-I) characteristics of sampled lateral grating THz QCLs measured in pulsed mode at 10 K. Voltage-current characteristics of the device with a grating duty cycle of 1/2 is also shown. (b) Enlarged view of power-current (P-I) characteristics for different sample grating THz QCLs. (c) Emission spectrum of the THz QCL with d = 1

Fig.3 (a) Emission spectra of sampled lateral grating THz QCLs with d = 1/2 and an F-P laser at injection currents near the rollover of power-current (P-I) curves. (b) Emission spectra of sampled lateral grating THz QCLs with d = 1/3 and 1/2 in pulsed mode at injection currents around 2.1 A at 10 K

Fig.4 (a) Schematic diagram of the scanning angles used in far-field measurements. (b) Measured two-dimensional far-field pattern of the sampled lateral grating THz QCL at a drive current of 1.86 A with d = 1/2. FWHM is about 44°(θ) ×40°(Φ)

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