Ultrafast Nonlinearity and Broadband Photodynamics in Fe-Doped GaN Crystals

Jianping Wang; Xingzhi Wu; Junyi Yang; Yongqiang Chen; Quanying Wu; Yinglin Song; Yu Fang

doi:10.3788/AOS202242.2219001

Acta Optica Sinica, Volume. 42, Issue 22, 2219001(2022)

Ultrafast Nonlinearity and Broadband Photodynamics in Fe-Doped GaN Crystals

Jianping Wang¹, Xingzhi Wu¹, Junyi Yang², Yongqiang Chen¹, Quanying Wu¹, Yinglin Song², and Yu Fang^1、*

¹School of Physical Science and Technology, Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu , China

²School of Physical Science and Technology, Soochow University, Suzhou 215006, Jiangsu , China

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Figures & Tables(9)

Fig. 1. Schematic of pump-probe

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$Nonlinear optical responses of GaN∶Fe with different doping concentrations. Nondegenerate absorption dynamics of (a) low-Fe and (c) high-Fe crystals; nondegenerate refractive dynamics of (b) low-Fe and (d) high-Fe crystals$

Fig. 2. Nonlinear optical responses of GaN∶Fe with different doping concentrations. Nondegenerate absorption dynamics of (a) low-Fe and (c) high-Fe crystals; nondegenerate refractive dynamics of (b) low-Fe and (d) high-Fe crystals

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Fig. 3. Equivalent four-level diagram of GaN∶Fe

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Fig. 4. Transient absorption spectra under single photon excitation. (a) low-Fe; (b) med-Fe; (c) high-Fe

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Fig. 5. Transient kinetic curves of samples under single-photon excitation (solid lines are four-level global fitting curves). (a) low-Fe; (b) med-Fe; (c) high-Fe

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Fig. 6. Linear absorption spectra of GaN∶Fe

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Fig. 7. Kinetic model of carrier excitation capture and absorption established based on different charge states of Fe defect states

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Table 1. Photophysical parameters obtained by fitting transient nonlinear model based on rate equation
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Table 1. Photophysical parameters obtained by fitting transient nonlinear model based on rate equation
Sample
β /
（10^-11 m·W^-1）
τ₁ /ps τ₂ /ps
η₀ /
（10^-22 cm³）
low-Fe
med-Fe
1.30
1.55
8.0
2.8
100
21
-3.4
-7.7
high-Fe 1.20 2.1 13 -2.0

Table 2. Global fitting parameters of GaN samples with different Fe-doped concentrations
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Table 2. Global fitting parameters of GaN samples with different Fe-doped concentrations
Sample τ₁ /ps τ₂ /ps τ₃ /ns
low-Fe 0.50 125 3.4
med-Fe 2.30 76 11.2
high-Fe 2.21 19 7.7

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Jianping Wang, Xingzhi Wu, Junyi Yang, Yongqiang Chen, Quanying Wu, Yinglin Song, Yu Fang. Ultrafast Nonlinearity and Broadband Photodynamics in Fe-Doped GaN Crystals[J]. Acta Optica Sinica, 2022, 42(22): 2219001

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Paper Information

Category: Nonlinear Optics

Received: Apr. 14, 2022

Accepted: May. 23, 2022

Published Online: Nov. 7, 2022

The Author Email: Fang Yu (yufang@usts.edu.cn)

DOI:10.3788/AOS202242.2219001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Photophysical parameters obtained by fitting transient nonlinear model based on rate equation

Table 1. Photophysical parameters obtained by fitting transient nonlinear model based on rate equation

Table 2. Global fitting parameters of GaN samples with different Fe-doped concentrations

Table 2. Global fitting parameters of GaN samples with different Fe-doped concentrations