Optical Characteristics of Second-Order Distributed Feedback Terahertz Quantum Cascade Laser

Xin Li; Jian Wang; Ning Yang; Weidong Chu

doi:10.3788/AOS201838.0414002

Acta Optica Sinica, Volume. 38, Issue 4, 0414002(2018)

Optical Characteristics of Second-Order Distributed Feedback Terahertz Quantum Cascade Laser

Xin Li¹, Jian Wang^1、*, Ning Yang², and Weidong Chu²

¹ Institute of Optical Information, Key Lab of Education Ministry on Luminescence and Optical Information Technology, Beijing Jiaotong University, Beijing 100044, China

² Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

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Figures & Tables(6)

Fig. 1. Schematic of second-order DFB THz QCL of single-side metal waveguide

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Fig. 2. Variation of coupling coefficient κ1, κ2 with (a) duty cycle σ and (b) grating depth di in active region

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Fig. 3. Variation of threshold gain gth with duty cycle σ when (a) r=0 and (b) r=0.565; (c) variation of threshold gain difference Δgth with duty cycle σ in different end faces

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Fig. 4. Photon density distribution along the laser cavity in different (a) duty cycles σ and (b) grating depths di in active region

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Fig. 5. Variation of external differential quantum efficiency η of end-emitting and surface-emitting with (a) duty cycle σ and (b) grating depth di in active region

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Table 1. Electromagnetic parameters of THz QCL

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Table 1. Electromagnetic parameters of THz QCL

Parameter	Value
Metal cladding refractive index n_Au	245.0325+360.5099i
Active region refractive index n_a	3.5639-0.03i
Contact layer refractive index n_c	3.8657+23.0439i
Substrate refractive index n_s	3.6635+0.0011i
Metal cladding thickness $\begin{matrix} {d_{Au}}_{} \end{matrix}$ /μm	0.25
Upper contact layer thickness $\begin{matrix} {d_{uc}}_{} \end{matrix}$ /μm	0.2
Active region thickness $\begin{matrix} {d_{a}}_{} \end{matrix}$ /μm	14
Lower contact layer thickness $\begin{matrix} {d_{lc}}_{} \end{matrix}$ /μm	0.8
Substrate thickness $\begin{matrix} {d_{S}}_{} \end{matrix}$ /μm	200
Vacuum Bragg wavelength $\begin{matrix} {λ_{B}}_{} \end{matrix}$ /μm	100
Waveguide loss $\begin{matrix} {α_{i}}_{} \end{matrix}$ /cm^-1	6.52

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Xin Li, Jian Wang, Ning Yang, Weidong Chu. Optical Characteristics of Second-Order Distributed Feedback Terahertz Quantum Cascade Laser[J]. Acta Optica Sinica, 2018, 38(4): 0414002

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Paper Information

Category: Lasers and Laser Optics

Received: Sep. 1, 2017

Accepted: --

Published Online: Jul. 10, 2018

The Author Email: Wang Jian (jwang@bjtu.edu.cn)

DOI:10.3788/AOS201838.0414002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology