Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho<sup>3+</sup>:YAG laser pumped gain-switched Cr<sup>2+</sup>:CdSe laser

Hengkang Zhang; Encai Ji; Bin Zhang; Yi Chen; Baoquan Yao; Qiang Liu

doi:10.3788/COL202018.031403

Chinese Optics Letters, Volume. 18, Issue 3, 031403(2020)

Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho³⁺:YAG laser pumped gain-switched Cr²⁺:CdSe laser

Hengkang Zhang^1,2, Encai Ji³, Bin Zhang^1,2, Yi Chen⁴, Baoquan Yao⁴, and Qiang Liu^1,2、*

Author Affiliations

¹Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing 100084, China

²State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China

³School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China

⁴National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China

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Fig. 1. Schematic diagram of the gain-switched ${Cr}^{2 +} : CdSe$ laser. L: plano-convex lens; DM: dichroic mirror; OC: output coupler; BS: beam splitter; PD: photodetector.

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Fig. 2. Pump laser pulse profile and spectrum.

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Fig. 3. Power performance of the gain-switched ${Cr}^{2 +} : CdSe$ laser. Inset (a): the temporal profiles of the ${Cr}^{2 +} : CdSe$ laser and the ${Ho}^{3 +} : YAG$ laser under the maximum pump power. Inset (b): the pulse train under the maximum pump power.

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Fig. 4. Output spectrum of the ${Cr}^{2 +} : CdSe$ laser.

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Fig. 5. Beam quality of the ${Cr}^{2 +} : CdSe$ laser.

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Fig. 6. Temporal profiles of the output pulses under different pump powers: (a) experimental results; (b) simulation results.

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Fig. 7. (a) Pulse duration and (b) peak power of the output pulse under different pump powers.

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Fig. 8. Temporal profiles of the output pulse and the pump pulse with (a) 20% output transmissivity, 45 mm cavity length; (b) 80% output transmissivity, 45 mm cavity length; (c) 20% output transmissivity, 500 mm cavity length; (d) 80% output transmissivity, 500 mm cavity length.

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Table 1. Parameters Used in the Numerical Simulation

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Table 1. Parameters Used in the Numerical Simulation

Parameter	Value^[15,26,34]
Refractive index at 2.65 μm, $n$	2.46
Absorption cross section at 2.09 μm, $σ_{a}$	$1.94 \times 10^{- 18} {cm}^{2}$
Emission cross section at 2.65 μm, $σ_{e}$	$2.0 \times 10^{- 18} {cm}^{2}$
Fluorescence lifetime at 287 K, $τ$	3.7 μs
Crystal length, $L_{0}$	16 mm
Cavity length, $L$	45 mm
Doping concentration of ${Cr}^{2 +}$ , $N_{0}$	$1.0 \times 10^{18} {cm}^{- 3}$
Transmissivity of OC, $T_{OC}$	20%
Intrinsic loss coefficient, $α$	$0.13 {cm}^{- 1}$

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Hengkang Zhang, Encai Ji, Bin Zhang, Yi Chen, Baoquan Yao, Qiang Liu, "Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho³⁺:YAG laser pumped gain-switched Cr²⁺:CdSe laser," Chin.Opt.Lett. 18, 031403 (2020)

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Paper Information

Category: Lasers and Laser Optics

Received: Oct. 31, 2019

Accepted: Dec. 11, 2019

Published Online: Mar. 10, 2020

The Author Email: Qiang Liu (qiangliu@mail.tsinghua.edu.cn)

DOI:10.3788/COL202018.031403

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology