Dynamic Behavior of Distributed Feedback Terahertz Quantum Cascade Lasers in Self-Injection of Optical Field

Lei Ge; Weidong Chu; Ning Yang

doi:10.3788/LOP231729

Laser & Optoelectronics Progress, Volume. 61, Issue 15, 1514007(2024)

Dynamic Behavior of Distributed Feedback Terahertz Quantum Cascade Lasers in Self-Injection of Optical Field

Lei Ge¹, Weidong Chu², and Ning Yang^2、*

Author Affiliations

¹Beijing Computational Science Research Center, Beijing 100094, China

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

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Figures & Tables(5)

Fig. 1. Schematic of a DFB THz-QCL with self-injection

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Fig. 2. Phase portrait for various feedback intensities. (a)‒(c) Periodic state, quasi periodic state, and chaotic state

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Fig. 3. Phase portrait of DFB THz-QCLs for various feedback intensities. (a)‒(c) Periodic state, quasi periodic state, and chaotic state

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Fig. 4. Output signals of DFB THz-QCLs with a moving target under different feedback intensities. (a)‒(c)Time evolution results of Eq. (2)‒(6); (d)‒(f) results of steady starts model

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Table 1. Parameters for calculations

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Table 1. Parameters for calculations

Parameter	Symbol	Value
Laser length	$L$ /cm	0.3
Number of gains stages	$Z$	100
Linewidth enhancement factor	$α$	0.1
Initial distance	$L_{e x}$ /cm	30
Effective refractive index	$n_{e f f}$	3.6
Solitary frequency	$ν_{0}$ /THz	2.6
Different gain coefficient	$G$	5.4×10⁴
Injection current	$I_{i n}$ /mA	430
Photon lifetime	$τ_{p}$ /ps	3.7^［32］
Scattering lifetime from N₃ to N₂	$τ_{32}$ /ps	2^［32］
Scattering lifetime from N₃ to N₁	$τ_{31}$ /ps	2.4^［32］
Scattering lifetime from N₂ to N₁	$τ_{21}$ /ps	0.3^［32］

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Lei Ge, Weidong Chu, Ning Yang. Dynamic Behavior of Distributed Feedback Terahertz Quantum Cascade Lasers in Self-Injection of Optical Field[J]. Laser & Optoelectronics Progress, 2024, 61(15): 1514007

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Paper Information

Category: Lasers and Laser Optics

Received: Jul. 17, 2023

Accepted: Aug. 22, 2023

Published Online: Aug. 8, 2024

The Author Email: Ning Yang (yang_ning@iapcm.ac.cn)

DOI:10.3788/LOP231729

CSTR:32186.14.LOP231729

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology