Two-Mode Chaos Generation in Quantum Dot Micropillar Lasers Subject to Optical Feedback

Gongming Guo; Yanqiang Guo

doi:10.3788/LOP202259.0514003

Laser & Optoelectronics Progress, Volume. 59, Issue 5, 0514003(2022)

Two-Mode Chaos Generation in Quantum Dot Micropillar Lasers Subject to Optical Feedback

Gongming Guo^1,2 and Yanqiang Guo^1,2、*

¹Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan , Shanxi 030024, China

²College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan , Shanxi 030024, China

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Figures & Tables(10)

Fig. 1. Model diagram of two-mode chaotic light field based on quantum dot micropillar laser with optical feedback. (a) Schematic of experimental setup; (b) schematic of theoretical mode

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Fig. 2. When the feedback strengths of strong mode and weak mode are 15 ns^-1 and 10 ns^-1, theoretical chaotic output intensity of quantum dot micropillar laser as a function of pump current

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Fig. 3. When feedback intensities of strong mode and weak mode are 15 ns^-1 and 10 ns^-1, mode-switching results between strong mode and weak mode at three pump currents. (a) 7 μA; (b) 10 μA; (c) 13 μA

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Fig. 4. Power bifurcation of strong mode and weak mode varing with feedback intensity at different pump currents. (a) Strong mode of 9-19 ns^-1; (b) weak mode of 5-15 ns^-1

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Fig. 5. Power spectra and phase attractors of two modes when pump current is $J$ =13 μA, feedback intensities of strong mode and weak mode are $κ_{s}$ =15 ns^-1 and $κ_{w}$ =10 ns^-1, respectively. (a) (b) Power spectra of strong-mode and weak-mode chaotic output; (c) (d) phase attractors of strong-mode and weak-mode chaotic output

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Fig. 6. Variation of effective bandwidth of strong mode and weak mode output chaotic light field with feedback intensity at different pump currents. (a) Strong mode; (b) weak mode

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Fig. 7. Related results when pump current is $J$ =13 μA, feedback intensities of strong mode and weak mode are $κ_{s}$ =15 ns^-1 and $κ_{w}$ =10 ns^-1, respectively. (a) (b) Strong-mode and weak-mode autocorrelation function of chaotic laser; (c) intensity cross-correlation point diagram of strong mode and weak mode

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Fig. 8. Variation of TDS peak value of strong mode and weak mode output chaotic light field with feedback intensity at different pump currents. (a) Strong mode; (b) weak mode

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Fig. 9. Strong-mode and weak-mode peak values of TDS of the chaotic laser varing with linewidth enhancement factor at different pump currents. (a) Strong mode; (b) weak mode

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Table 1. Theoretical parameters of quantum dot micropillar laser with optical feedback

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Table 1. Theoretical parameters of quantum dot micropillar laser with optical feedback

Symbol	Parameter	Value
$ε_{s s}$	Auto-compression factor （strong mode）	40 m²⋅W^-1
$ε_{w w}$	Auto-compression factor （weak mode）	30 m²⋅W^-1
$ε_{s w}$	Cross-compression factor （strong mode）	46 m²⋅W^-1
$ε_{s w}$	Cross-compression factor （weak mode）	30 m²⋅W^-1
$t_{s}$	Optical gain coeffificient （strong mode）	3.27 m²⋅V^-2⋅s^-1
$t_{w}$	Optical gain coeffificient （weak mode）	2.62 m²⋅V^-2⋅s^-1
$β$	Spontaneous emission factor	0.018
$J_{p}$	Parasitic current	2.2×10^-6 A
$η$	Injection effificiency	0.094
$τ_{F B}$	Feedback delay time	5.5×10^-9 s
$τ_{r}$	Reservoir carrier lifetime	1×10^-9 s
$τ_{s p}$	QD lifetime	1×10^-10 s
$S_{i n}$	Effective scattering rate	7×10^-3 m²⋅s^-1
$V$	Lasing mode volume	4×10^-18 m³
$A$	Effective lasing mode area	3.1×10^-12 m²
$Z^{Q D}$	Number of active QDs	250
$Z^{i n a c}$	Number of inactive QDs	400
$ℏ w$	Photon energy	1.38 eV
$α$	Linewidth enhancement factor	1

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Gongming Guo, Yanqiang Guo. Two-Mode Chaos Generation in Quantum Dot Micropillar Lasers Subject to Optical Feedback[J]. Laser & Optoelectronics Progress, 2022, 59(5): 0514003

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Paper Information

Category: Lasers and Laser Optics

Received: May. 6, 2021

Accepted: Jun. 7, 2021

Published Online: Feb. 22, 2022

The Author Email: Guo Yanqiang (guoyanqiang@tyut.edu.cn)

DOI:10.3788/LOP202259.0514003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology