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:doi:10.3788/COL202018.031403

Chinese Optics Letters, 2020, 18 (3): 031403, Published Online: Mar. 10, 2020

Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho³⁺:YAG laser pumped gain-switched Cr²⁺:CdSe laser Download： 668次

Hengkang Zhang ^1,2Encai Ji ³Bin Zhang ^1,2Yi Chen ⁴Baoquan Yao ⁴Qiang Liu ^1,2,*

Author Affiliations

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

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

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

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

Figures & Tables

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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Table1. 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[J]. Chinese Optics Letters, 2020, 18(3): 031403.

Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho³⁺:YAG laser pumped gain-switched Cr²⁺:CdSe laser Download： 668次

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.

Fig. 2. Pump laser pulse profile and spectrum.

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.

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

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

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

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

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.

Table1. Parameters Used in the Numerical Simulation

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Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser Download： 668次

Fig. 1. Schematic diagram of the gain-switched Cr2+:CdSe laser. L: plano-convex lens; DM: dichroic mirror; OC: output coupler; BS: beam splitter; PD: photodetector.

Fig. 2. Pump laser pulse profile and spectrum.

Fig. 3. Power performance of the gain-switched Cr2+:CdSe laser. Inset (a): the temporal profiles of the Cr2+:CdSe laser and the Ho3+:YAG laser under the maximum pump power. Inset (b): the pulse train under the maximum pump power.

Fig. 4. Output spectrum of the Cr2+:CdSe laser.

Fig. 5. Beam quality of the Cr2+:CdSe laser.

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

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

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.

Table1. Parameters Used in the Numerical Simulation

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Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho³⁺:YAG laser pumped gain-switched Cr²⁺:CdSe laser Download： 668次

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.

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.

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

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