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

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

doi:10.3788/COL202018.031403

Journals >Chinese Optics Letters >Volume 18 >Issue 3 >Page 031403 > Article

Chinese Optics Letters
Vol. 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

show less

DOI: 10.3788/COL202018.031403 Cite this Article Set citation alerts

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 Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

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. 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.

Download full size | View in the Article

Fig. 2. Pump laser pulse profile and spectrum.

Download full size | View in the Article

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.

Download full size | View in the Article

Fig. 4. Output spectrum of the

{Cr}^{2 +} : CdSe

laser.

Download full size | View in the Article

Fig. 5. Beam quality of the

{Cr}^{2 +} : CdSe

laser.

Download full size | View in the Article

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

Download full size | View in the Article

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

Download full size | View in the Article

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.

Download full size | View in the Article

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, $α$	$0.13 {cm}^{- 1}$