High performance visible generation of Ho<sup>3+</sup>-doped all-fiber lasers

Shuaihao Ji; Xuexian Lin; Bo Xiao; Zhongyu Wang; Xiuji Lin; Zhiping Cai

doi:10.1364/PRJ.500147

Photonics Research, Volume. 11, Issue 12, 2121(2023)

High performance visible generation of Ho³⁺-doped all-fiber lasers

Shuaihao Ji, Xuexian Lin, Bo Xiao, Zhongyu Wang, Xiuji Lin, and Zhiping Cai^*

Department of Electronic Engineering, School of Electronic Science and Engineering (National Model Microelectronics College), Xiamen University, Xiamen 361005, China

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Fig. 1. Emission cross sections of Ho3+:ZFG under 640 nm excitation.

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Fig. 2. Proposed two-photon absorption model in Ho3+ ions based on the 640 nm pumping process.

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Fig. 3. (a) Experimental setup of Ho3+-doped ZFG all-fiber lasers. Optical transmission properties of the fiber end-facet mirrors: (b) 1.2 μm and (c) 750 nm.

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Fig. 4. Measured output power with respect to the absorbed pump powers for active fiber lengths of (a) 20 cm, (b) 30 cm, (c) 40 cm, and (d) 50 cm. The red dots and green squares, respectively, refer to 1.2 μm and 750 nm emissions.

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Fig. 5. Near-infrared wavelength based on different lengths of Ho3+:ZFG fiber.

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Fig. 6. Output characteristics of all-fiber deep-red Ho3+:ZFG laser with the different output mirrors: (a) M4 and (b) M5.

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Fig. 7. High output characteristics of Ho3+-doped deep-red fiber laser.

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Fig. 8. Experimental and simulated deep-red laser performances at 750 nm. (a) Output power and threshold versus the fiber length and output mirrors’ reflectivity; (b) high output power as a function of different fiber lengths.

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Table 1. Basic Parameters of Ho³⁺:ZFG Fiber Lasers Used in the Simulations

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Table 1. Basic Parameters of Ho³⁺:ZFG Fiber Lasers Used in the Simulations

Parameter	Value	Parameter	Value
$λ_{p}$	640 nm	$N$	$2.935 \times 10^{19} {cm}^{- 3}$
$λ_{s}$	750 nm	$α_{p}$	$0.002 {cm}^{- 1}$
$τ$	260 μs	$α_{s}$	$0.001 {cm}^{- 1}$
$σ_{ap}$	$0.39 \times 10^{- 20} {cm}^{2}$	$Γ_{p}$	0.0036
$σ_{ep}$	$0.25 \times 10^{- 20} {cm}^{2}$	$Γ_{s}$	0.8
$σ_{as}$	$0.20 \times 10^{- 20} {cm}^{2}$	$R_{1} (λ_{s})$	0.99
$σ_{es}$	$1.13 \times 10^{- 20} {cm}^{2}$	$R_{1} (λ_{p})$	0.15
$R_{2} (λ_{s})$	Variable	$R_{2} (λ_{p})$	Variable

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Shuaihao Ji, Xuexian Lin, Bo Xiao, Zhongyu Wang, Xiuji Lin, Zhiping Cai. High performance visible generation of Ho³⁺-doped all-fiber lasers[J]. Photonics Research, 2023, 11(12): 2121

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