Pulse compression and threshold decrease in high- repetition-rate doubly Q-switched intracavity optical parametric oscillator

Jing Wang; Shengzhi Zhao; Kejian Yang; Lei Dong; Guiqiu Li; Dechun Li; Ming Li; Jing An; Wenchao Qiao

doi:10.1364/JOSAB.24.002521

Pulse compression and threshold decrease in high- repetition-rate doubly Q-switched intracavity optical parametric oscillator

Jing Wang, Shengzhi Zhao, Kejian Yang, Lei Dong, Guiqiu Li, Dechun Li, Ming Li, Jing An, and Wenchao Qiao

Journal of the Optical Society of America B
Vol. 24,
Issue 9,
pp. 2521-2525
(2007)
•https://doi.org/10.1364/JOSAB.24.002521

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Jing Wang, Shengzhi Zhao, Kejian Yang, Lei Dong, Guiqiu Li, Dechun Li, Ming Li, Jing An, and Wenchao Qiao, "Pulse compression and threshold decrease in high- repetition-rate doubly Q-switched intracavity optical parametric oscillator," J. Opt. Soc. Am. B 24, 2521-2525 (2007)

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Table of Contents Category
- Nonlinear Optics
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Nonlinear optics, parametric processes (190.4410)
- Parametric oscillators and amplifiers (190.4970)

About this Article
History
- Original Manuscript: February 5, 2007
- Revised Manuscript: April 25, 2007
- Manuscript Accepted: July 9, 2007
- Published: August 31, 2007

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Abstract

By using $Rb Ti O P O_{4}$ (RTP) crystals as an electro-optic (EO) modulator and ${Cr}^{4 +} : YAG$ saturable absorber as a passive Q switch, a high repetition rate doubly Q-switched intracavity optical parametric oscillator (IOPO) is realized. In comparison to an EO Q-switched IOPO, the lower threshold energy, the higher output energy, the narrower pulse width, and the higher conversion efficiency from the doubly Q-switched IOPO can be obtained. By considering the gradual loss from the delayed switched time of the EO switch, the coupled rate equations of doubly Q-switched IOPO under the assumption of the uniform distributions of the intracavity photon densities are given, and the numerical solution of the equations fits the experimental data well.

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Parameters	Values	Parameters	Values
σ	$2.8 \times 10^{- 19} {cm}^{2}$	$δ_{e}$	0.96
$t_{EO}$	$8 ns$	$σ_{e}$	$8.2 \times 10^{- 18} {cm}^{2}$
τ	$230 μ s$	$n_{y 0}$	$2.0 \times 10^{17} {cm}^{- 3}$
$n_{1}$	1.82	d	$10.6 cm$
$n_{2}$	1.77	$l_{KTP}$	$2.0 cm$
L	0.1	l	$47 cm$
$τ_{y}$	$3.2 μ s$	$l_{g}$	$20 cm$

Parameters	Values	Parameters	Values
$l_{OPO}$	$3 cm$	$n_{s}$	1.73
$d_{eff}$	$3.64 pm ∕ V$	$n_{i}$	1.78
$n_{p}$	1.83

Parameters	Values	Parameters	Values
σ	$2.8 \times 10^{- 19} {cm}^{2}$	$δ_{e}$	0.96
$t_{EO}$	$8 ns$	$σ_{e}$	$8.2 \times 10^{- 18} {cm}^{2}$
τ	$230 μ s$	$n_{y 0}$	$2.0 \times 10^{17} {cm}^{- 3}$
$n_{1}$	1.82	d	$10.6 cm$
$n_{2}$	1.77	$l_{KTP}$	$2.0 cm$
L	0.1	l	$47 cm$
$τ_{y}$	$3.2 μ s$	$l_{g}$	$20 cm$

Parameters	Values	Parameters	Values
$l_{OPO}$	$3 cm$	$n_{s}$	1.73
$d_{eff}$	$3.64 pm ∕ V$	$n_{i}$	1.78
$n_{p}$	1.83

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