Continuous-wave single-mode quantum cascade laser at 5.1 THz based on graded sampled grating design

Weijiang Li; Yu Ma; Yunfei Xu; Junqi Liu; Lijun Wang; Ning Zhuo; Quanyong Lu; Jinchuan Zhang; Shenqiang Zhai; Shuman Liu; Fengqi Liu

doi:10.1364/PRJ.467974

Photonics Research, Volume. 10, Issue 12, 2686(2022)

Continuous-wave single-mode quantum cascade laser at 5.1 THz based on graded sampled grating design

Weijiang Li^1,2, Yu Ma^1,2, Yunfei Xu^1,2, Junqi Liu^1,2,4、*, Lijun Wang^1,2,5、*, Ning Zhuo^1,6、*, Quanyong Lu³, Jinchuan Zhang¹, Shenqiang Zhai¹, Shuman Liu^1,2, and Fengqi Liu^1,2,3

Author Affiliations

¹Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

²College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 101408, China

³Division of Quantum Materials and Devices, Beijing Academy of Quantum Information Sciences, Beijing 100193, China

⁴e-mail:

⁵e-mail:

⁶e-mail:

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Fig. 1. Schematic conduction band diagram of one module of the four-quantum-wells active region under an applied electric field of 9.9 kV·cm−1.

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Fig. 2. (a) Schematic diagram of the graded sampled grating DFB QCL. (b) Calculated mode loss versus wavelength for the QCL with graded sampled grating. (c) The envelope distribution of mode intensities (|Ey|2) inside lasers with three different grating structures. (d) The top view images of the DFB QCL structure and one-period sampled grating taken with a 3D stereomicroscope and one-period sampled grating.

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Fig. 3. (a) Light peak output power-current-voltage (L-I-V) characteristics of the FP lasers of various dimensions at 8 K. (b) Temperature-dependent L-I-V characteristics in pulsed mode of the FP laser with dimensions 0.25×5 mm2. (c) Temperature-dependent L-I-V characteristics in CW mode of the FP QCL with dimensions 0.15×2 mm2. (d) Emission spectra of the device shown in (c) at various injection current densities.

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Fig. 4. (a) CW L-I-V curves of DFB QCL with the dimensions 0.15×2 mm2 at various heat sink temperatures. (b) The corresponding emission spectra at various heat sink temperatures for an injection current of 0.95 A.

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Fig. 5. (a) Output powers of coated and uncoated devices with uniform grating and device with graded sampled grating. (b) The optical powers and ratio between the front and the rear facets of 12 graded sampled DFB QCLs and five uniform grating DFB QCLs with the dimension of 0.15×2 mm2.

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Table 1. Key Computed Parameters of the Active Region at a Temperature of 100 K^a
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Table 1. Key Computed Parameters of the Active Region at a Temperature of 100 K^a
$ℏ ω_{5, 4}$ $ℏ ω_{5, 3}$ $z_{5, 4}$ $z_{5, 3}$ $f_{5, 4}$ $f_{5, 3}$ $f_{6, 7}$ $f_{5^{'}, 7}$ $f_{6, 8}$ Ω_1,5 $τ_{5}$
19.2 meV 22.1 meV 29.4 Å 17 Å 0.29 0.11 0.05 0.007 0.012 0.65 meV 1.45 ps

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Weijiang Li, Yu Ma, Yunfei Xu, Junqi Liu, Lijun Wang, Ning Zhuo, Quanyong Lu, Jinchuan Zhang, Shenqiang Zhai, Shuman Liu, Fengqi Liu. Continuous-wave single-mode quantum cascade laser at 5.1 THz based on graded sampled grating design[J]. Photonics Research, 2022, 10(12): 2686

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Paper Information

Category: Lasers and Laser Optics

Received: Jun. 16, 2022

Accepted: Oct. 3, 2022

Published Online: Nov. 4, 2022

The Author Email: Junqi Liu (jqliu@semi.ac.cn), Lijun Wang (ljwang@semi.ac.cn), Ning Zhuo (zhuoning@semi.ac.cn)

DOI:10.1364/PRJ.467974

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Key Computed Parameters of the Active Region at a Temperature of 100 Ka

Table 1. Key Computed Parameters of the Active Region at a Temperature of 100 Ka

Table 1. Key Computed Parameters of the Active Region at a Temperature of 100 K^a

Table 1. Key Computed Parameters of the Active Region at a Temperature of 100 K^a