Passively Q-switched performance of a Nd:Gd3Ga5O12 eye-safe laser at 1423.4&#x2009;&#x2009;nm with Co2&#x2B;:LaMgAl11O19 as saturable absorber

Huanian Zhang; Baomin Ma; Xiaohan Chen; Qingpu Wang; Xutang Tao; Ping Li

doi:10.1364/AO.52.008576

Applied Optics
Vol. 52,
Issue 35,
pp. 8576-8580
(2013)
•https://doi.org/10.1364/AO.52.008576

Passively Q-switched performance of a Nd:Gd₃Ga₅O₁₂ eye-safe laser at 1423.4 nm with Co²⁺:LaMgAl₁₁O₁₉ as saturable absorber

Huanian Zhang, Baomin Ma, Xiaohan Chen, Qingpu Wang, Xutang Tao, and Ping Li

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Huanian Zhang, Baomin Ma, Xiaohan Chen, Qingpu Wang, Xutang Tao, and Ping Li, "Passively Q-switched performance of a Nd:Gd₃Ga₅O₁₂ eye-safe laser at 1423.4 nm with Co²⁺:LaMgAl₁₁O₁₉ as saturable absorber," Appl. Opt. 52, 8576-8580 (2013)

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Abstract

The performance of a LD-pumped passively $Q$ -switched Nd:GGG eye-safe laser at 1423.4 nm with a ${Co}^{2 +} : {LaMgAl}_{11} O_{19}$ (Co:LMA) saturable absorber is demonstrated. A maximum average output power of 627 mW with an optical-to-optical efficiency of 3.35% and a slope efficiency of 5.1% was obtained under a pump power of 18.7 W. A minimum pulsewidth of 102 ns and a pulse repetition rate of 35 kHz were obtained with the $T = 1.0 %$ output coupler.

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Transition of Nd:GGG	Wavelength, nm	$σ$ , $10^{- 20} m^{2}$
${{}^{4}F}_{3 / 2} \to {{}^{4}I}_{13 / 2}$ $R_{1} \to X_{7}$	1423.4	2.4
${{}^{4}F}_{3 / 2} \to {{}^{4}I}_{13 / 2}$ $R_{1} \to X_{1}$ , $R_{2} \to X_{2}$	1331.5	9.5
${{}^{4}F}_{3 / 2} \to {{}^{4}I}_{11 / 2}$	1062.1	28

Parameters	Values
$d n / d T$ : Thermal-optic coefficient	$17 \times 10^{- 6} K^{- 1}$
$n$ : Refractive index	1.95
$α_{T}$ : Thermal expansion coefficient	$8 \times 10^{- 6} K^{- 1}$
$α$ : Absorption coefficient	$3 {cm}^{- 1}$
$K_{C}$ : Thermal conductivity at 25 °C	$6.43 {Wm}^{- 1} K^{- 1}$
$L$ : Length of the crystal	10 mm
$ξ$ : Thermal conversion coefficient	0.3
$ω_{p}$ : Pump laser beam radius	0.2 mm

Transition of Nd:GGG	Wavelength, nm	$σ$ , $10^{- 20} m^{2}$
${{}^{4}F}_{3 / 2} \to {{}^{4}I}_{13 / 2}$ $R_{1} \to X_{7}$	1423.4	2.4
${{}^{4}F}_{3 / 2} \to {{}^{4}I}_{13 / 2}$ $R_{1} \to X_{1}$ , $R_{2} \to X_{2}$	1331.5	9.5
${{}^{4}F}_{3 / 2} \to {{}^{4}I}_{11 / 2}$	1062.1	28

Parameters	Values
$d n / d T$ : Thermal-optic coefficient	$17 \times 10^{- 6} K^{- 1}$
$n$ : Refractive index	1.95
$α_{T}$ : Thermal expansion coefficient	$8 \times 10^{- 6} K^{- 1}$
$α$ : Absorption coefficient	$3 {cm}^{- 1}$
$K_{C}$ : Thermal conductivity at 25 °C	$6.43 {Wm}^{- 1} K^{- 1}$
$L$ : Length of the crystal	10 mm
$ξ$ : Thermal conversion coefficient	0.3
$ω_{p}$ : Pump laser beam radius	0.2 mm

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Equations (3)

Applied Optics