Simulation and experimental results of a high-gain two-stage and double-pass off-axis Nd:YVO<sub>4</sub> picosecond laser amplifier

Bingnan Shi; Guanbai He; Jiajia Mao; Feifei Wang; Kejian Yang; Kejian Yang; Baitao Zhang; Jingliang He; Jingliang He

doi:10.1364/AO.413502

Applied Optics
Vol. 60,
Issue 1,
pp. 186-193
(2021)
•https://doi.org/10.1364/AO.413502

Simulation and experimental results of a high-gain two-stage and double-pass off-axis Nd:YVO₄ picosecond laser amplifier

Bingnan Shi, Guanbai He, Jiajia Mao, Feifei Wang, Kejian Yang, Baitao Zhang, and Jingliang He

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Bingnan Shi, Guanbai He, Jiajia Mao, Feifei Wang, Kejian Yang, Baitao Zhang, and Jingliang He, "Simulation and experimental results of a high-gain two-stage and double-pass off-axis Nd:YVO₄ picosecond laser amplifier," Appl. Opt. 60, 186-193 (2021)

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Table of Contents Category
- Lasers, Optical Amplifiers, and Laser Optics
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About this Article
History
- Original Manuscript: October 29, 2020
- Revised Manuscript: December 7, 2020
- Manuscript Accepted: December 7, 2020
- Published: December 23, 2020

Abstract

A high-gain two-stage double-pass off-axis ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ picosecond laser amplifier has been developed. The comprehensive influence of crystal doping concentration and pump beam quality on the small-signal gain of the ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ amplifier is theoretically analyzed with a model developed by considering energy transfer upconversion and pump light absorption saturation effect. The thermal effect of ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ crystal with different doping concentrations, undoped end cap lengths, and pump beam quality is investigated as well. Based on the theoretical analysis, a high-gain two-stage and double-pass off-axis ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ amplifier based on picosecond fiber seed source is realized by choosing long-composite low-doping ${\rm{Nd}}{:}{{\rm{YVO}}_4}$ crystal and with high brightness laser diode pumping, delivering a gain of 28 dB and an output pulse energy of 67.5 µJ at a repetition rate of 200 kHz.

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Parameter	Value	Parameter	Value
$λ_{p}$	808 nm	$τ_{f}$	100 µs [26]
$λ_{l}$	1064 nm	$σ_{a}^{a}$	$0.79 \times 1 0^{- 19} {c m}^{2}$ [22]
$ω_{p 0}$	200 µm	$σ_{a}^{c}$	$2.7 \times 1 0^{- 19} {c m}^{2}$ [22]
$ω_{l 0}$	170 µm	$σ_{e}$	$12 \times 1 0^{- 19} {c m}^{2}$ [27]
$n_{p}$	1.97	$n_{t}$	$1.26 \times 1 0^{26} / m^{3}$ , 1 at.% [22]
$n_{l}$	2.16	$d z$	0.01 mm

Parameters	Values	Parameters	Values
$λ_{p}$	808 nm	$γ_{a}$	$4.43 \times 1 0^{- 6} K^{- 1}$ [30]
$λ_{l}$	1064 nm	$γ_{c}$	$11.37 \times 1 0^{- 6} K^{- 1}$ [30]
$L$	10 mm	$K$	0.05 W/cm/K [22]
$W$	3 mm	$υ$	0.33 [22]
$H$	3 mm	$E$	133 GPa [22]
$L_{c a p}$	0, 1, 2, 3 mm	$ρ$	$4.22 g / c m^{3}$
$N$	0.1, 0.2, 0.3 at.%	$C_{p}$	$551.4 J / (k g \cdot K)$ [31]
$n_{p}$	1.97	$h$	$10000 W / m^{2} / K$
$n_{l}$	2.16	NA	0.22
$α_{c}$	$34 c m^{- 1}$ , 1 at.% [22]	$a_{c o r e}$	100, 200, 400 µm
$α_{a}$	$10 c m^{- 1}$ , 1 at.% [22]	$ω_{p 0}$	200 µm
$T_{0}$	293.15 K	$z_{0}$	3 mm
$d n / d T$	$0.3 \times 1 0^{- 6} K^{- 1}$ $E \| \| c$ [32]	$P$	60 W

Parameter	Value	Parameter	Value
$λ_{p}$	808 nm	$τ_{f}$	100 µs [26]
$λ_{l}$	1064 nm	$σ_{a}^{a}$	$0.79 \times 1 0^{- 19} {c m}^{2}$ [22]
$ω_{p 0}$	200 µm	$σ_{a}^{c}$	$2.7 \times 1 0^{- 19} {c m}^{2}$ [22]
$ω_{l 0}$	170 µm	$σ_{e}$	$12 \times 1 0^{- 19} {c m}^{2}$ [27]
$n_{p}$	1.97	$n_{t}$	$1.26 \times 1 0^{26} / m^{3}$ , 1 at.% [22]
$n_{l}$	2.16	$d z$	0.01 mm

Parameters	Values	Parameters	Values
$λ_{p}$	808 nm	$γ_{a}$	$4.43 \times 1 0^{- 6} K^{- 1}$ [30]
$λ_{l}$	1064 nm	$γ_{c}$	$11.37 \times 1 0^{- 6} K^{- 1}$ [30]
$L$	10 mm	$K$	0.05 W/cm/K [22]
$W$	3 mm	$υ$	0.33 [22]
$H$	3 mm	$E$	133 GPa [22]
$L_{c a p}$	0, 1, 2, 3 mm	$ρ$	$4.22 g / c m^{3}$
$N$	0.1, 0.2, 0.3 at.%	$C_{p}$	$551.4 J / (k g \cdot K)$ [31]
$n_{p}$	1.97	$h$	$10000 W / m^{2} / K$
$n_{l}$	2.16	NA	0.22
$α_{c}$	$34 c m^{- 1}$ , 1 at.% [22]	$a_{c o r e}$	100, 200, 400 µm
$α_{a}$	$10 c m^{- 1}$ , 1 at.% [22]	$ω_{p 0}$	200 µm
$T_{0}$	293.15 K	$z_{0}$	3 mm
$d n / d T$	$0.3 \times 1 0^{- 6} K^{- 1}$ $E \| \| c$ [32]	$P$	60 W

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Equations (18)

Applied Optics