Time-resolved nonlinear refraction in femtosecond laser gain media

Sylvia Smolorz; Frank Wise

doi:10.1364/OL.23.001381

Optics Letters
Vol. 23,
Issue 17,
pp. 1381-1383
(1998)
•https://doi.org/10.1364/OL.23.001381

Time-resolved nonlinear refraction in femtosecond laser gain media

Sylvia Smolorz and Frank Wise

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Sylvia Smolorz and Frank Wise, "Time-resolved nonlinear refraction in femtosecond laser gain media," Opt. Lett. 23, 1381-1383 (1998)

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Abstract

We present time-resolved measurements of the electronic and the nuclear contributions to the third-order nonlinearities of Ti:sapphire and Cr:LiSGaF. The results suggest that nonlinear refraction in Ti:sapphire is resonantly enhanced relative to that of undoped sapphire. The implications of the nonlinear responses for short-pulse formation are discussed.

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Material	$n_{2} (10^{- 13} esu)$	$β (cm / GW)$	$R^{'} (10^{- 14} esu)$	$R^{″} (cm / GW)$	$T_{R} (ps)$
Ti:sapphire, electronic	$2.2 \pm 0.4$	$< 1 \times 10^{- 4}$
$Ω = 419 {cm}^{- 1}$			$0.4 \pm 0.1$	–	$6 \pm 1$
$Ω = 647 {cm}^{- 1}$			$0.2 \pm 0.1$	–	$2.0 \pm 0.5$
Cr:LiSGaF, electronic	$0.55 \pm 0.1$	$(9.2 \pm 2.3) \times 10^{- 4}$
$Ω = 233 {cm}^{- 1}$			$0.07 \pm 0.02$	$(2.4 \pm 0.8) \times 10^{- 6}$	$1.6 \pm 0.3$
$Ω = 351 {cm}^{- 1}$			$0.06 \pm 0.02$	$(2.1 \pm 0.7) \times 10^{- 6}$	$0.6 \pm 0.1$
$Ω = 554 {cm}^{- 1}$			$1.16 \pm 0.35$	$(3.7 \pm 1.1) \times 10^{- 5}$	$0.9 \pm 0.2$

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Optics Letters