Dual-loss-modulated Q-switched mode-locked laser intracavity pumped temperature-tuned subnanosecond KTiOPO<sub>4</sub> optical parametric oscillator

Hongwei Chu; Jia Zhao; Kejian Yang; Shengzhi Zhao; Dechun Li; Tao Li; Guiqiu Li; Wenchao Qiao

doi:10.1364/AO.54.010517

Applied Optics
Vol. 54,
Issue 35,
pp. 10517-10523
(2015)
•https://doi.org/10.1364/AO.54.010517

Dual-loss-modulated Q-switched mode-locked laser intracavity pumped temperature-tuned subnanosecond KTiOPO₄ optical parametric oscillator

Hongwei Chu, Jia Zhao, Kejian Yang, Shengzhi Zhao, Dechun Li, Tao Li, Guiqiu Li, and Wenchao Qiao

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Hongwei Chu, Jia Zhao, Kejian Yang, Shengzhi Zhao, Dechun Li, Tao Li, Guiqiu Li, and Wenchao Qiao, "Dual-loss-modulated Q-switched mode-locked laser intracavity pumped temperature-tuned subnanosecond KTiOPO₄ optical parametric oscillator," Appl. Opt. 54, 10517-10523 (2015)

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- Nonlinear Optics
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About this Article
History
- Original Manuscript: September 10, 2015
- Revised Manuscript: November 6, 2015
- Manuscript Accepted: November 10, 2015
- Published: December 10, 2015

Abstract

Using an acousto-optic modulator (AOM) and ${Cr}^{4 +} : YAG$ as the dual-loss modulation, an intracavity ${KTiOPO}_{4}$ optical parametric oscillator (OPO) pumped by a simultaneously $Q$ -switched and mode-locked (QML) ${YVO}_{4} / Nd : {YVO}_{4}$ laser was realized. The shortest mode-locking pulse duration of the signal wave at 1573 nm was directly measured as 450 ps at an AOM frequency of 2 kHz and a diode pump power of 10.5 W, corresponding to a peak power of 35.5 kW. The temperature tuning of the output signal wavelength was realized in the range from 1571.99 to 1572.61 nm with a blueshift ratio of $0.027 nm / °C$ . A set of coupled rate equations for the dual-loss-modulated QML laser pumping intracavity OPO was built for the first time to our knowledge. The numerical solutions were fitted with the experimental results.

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$σ$	$2.5 \times 10^{- 18} {cm}^{2}$	$α$	$3.8 {cm}^{- 1}$	$λ_{p}$	808 nm
$τ$	90 μs	$n$	1.96	$d_{eff}$	$7.2 pm / V$
$l$	8 mm	$l_{A O}$	47 mm	$n_{s}$	1.735
$t_{A O}$	14 ns	$δ_{a}$	1	$n_{c}$	1.82
$l_{c}$	1120 mm	$l_{s}$	1.4 mm	$σ_{g}$	$4.3 \times 10^{- 18} {cm}^{2}$
$l_{k}$	20 mm	$λ_{p}$	1064 nm	$h$	$6.63 \times 10^{- 34} J \cdot s$
$λ_{s}$	1573 nm	$λ_{i}$	3296 nm	$L_{s}$	0.1
$n_{a o}$	1.53	$n_{p}$	1.746	$n_{i}$	1.768
$n_{s 0}$	$2.5 \times 10^{17} {cm}^{- 3}$	$σ_{e}$	$8.2 \times 10^{- 19} {cm}^{2}$	$ε_{0}$	$8.85 \times 10^{- 12} F / m$
$R_{s}$	0.85	$L$	0.1	$K_{c}$	$5.1 W / mK$
$τ_{p}$	300 ps	$τ_{s}$	3.2 μs	$c$	$3 \times 10^{8} m / s$
$w_{p}$	200 μm	$w_{g}$	315 μm	$w_{s}$	161 μm
$w_{l}$	230 μm	$w_{a}$	301 μm	$w_{k}$	154 μm

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