Enhancement of the exponential gain coefficient as a result of the light-fanning effect in thin doped LiNbO<sub>3</sub> crystals

Jingwen Zhang; Wanjun Sun; Hua Zhao; Shaoping Bian; Kebin Xu; Minghua Li; Yuheng Xu

doi:10.1364/OL.18.001391

Optics Letters
Vol. 18,
Issue 17,
pp. 1391-1393
(1993)
•https://doi.org/10.1364/OL.18.001391

Enhancement of the exponential gain coefficient as a result of the light-fanning effect in thin doped LiNbO₃ crystals

Jingwen Zhang, Wanjun Sun, Hua Zhao, Shaoping Bian, Kebin Xu, Minghua Li, and Yuheng Xu

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Jingwen Zhang, Wanjun Sun, Hua Zhao, Shaoping Bian, Kebin Xu, Minghua Li, and Yuheng Xu, "Enhancement of the exponential gain coefficient as a result of the light-fanning effect in thin doped LiNbO₃ crystals," Opt. Lett. 18, 1391-1393 (1993)

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Abstract

The enhancement of the exponential gain coefficient of two-beam coupling in several thin samples of doped LiNbO₃ crystals is reported. The mechanism is analyzed by light crawling that originates from the light-fanning effect. Some experimental results to support the explanation are presented.

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Sample	Doping and Treatment	λ (nm)	α (cm⁻¹)	δ (mm)	2θ (deg)	I₂₀ (W cm⁻²)	β	Γ (cm⁻¹)
Fe:LN	0.065 mol. % Fe, reduced	488.0	39.0	0.20	38	1.67	3290	253.0
				0.44	38	2.45	3300	152.2
		514.5	35.0	0.20	45	1.58	3189	231.1
				0.44	45	2.03	3210	139.0
Tb, Fe:LN	0.100 mol. % Tb	488.0	4.0	0.50	45	2.37	2430	94.0
	0.050 mol. % Fe	514.5	3.8	0.50	45	2.69	2320	89.0
Ce, Nd:LN	0.100 mol. % Ce	488.0	4.2	0.50	45	2.37	2430	97.2
	0.200 mol. % Nd	514.5	3.8	0.50	45	2.69	2320	87.3
Ce:LN	0.100 mol.% Ce, reduced	488.0	10.0	0.50	45	2.98	1630	110.0
		514.5	12.3	0.50	45	3.04	1560	114.2

	Diameter D (mm)

	1.0	3.0	5.0	7.0	8.0
S_D/S₁	1.0	4.0	6.7	8.9	10.2
γ_D/γ₁	1.0	2.77	4.10	4.60	4.65
Γ	61.8	82.6	90.4	92.8	92.9

Sample	Doping and Treatment	λ (nm)	α (cm⁻¹)	δ (mm)	2θ (deg)	I₂₀ (W cm⁻²)	β	Γ (cm⁻¹)
Fe:LN	0.065 mol. % Fe, reduced	488.0	39.0	0.20	38	1.67	3290	253.0
				0.44	38	2.45	3300	152.2
		514.5	35.0	0.20	45	1.58	3189	231.1
				0.44	45	2.03	3210	139.0
Tb, Fe:LN	0.100 mol. % Tb	488.0	4.0	0.50	45	2.37	2430	94.0
	0.050 mol. % Fe	514.5	3.8	0.50	45	2.69	2320	89.0
Ce, Nd:LN	0.100 mol. % Ce	488.0	4.2	0.50	45	2.37	2430	97.2
	0.200 mol. % Nd	514.5	3.8	0.50	45	2.69	2320	87.3
Ce:LN	0.100 mol.% Ce, reduced	488.0	10.0	0.50	45	2.98	1630	110.0
		514.5	12.3	0.50	45	3.04	1560	114.2

	Diameter D (mm)

	1.0	3.0	5.0	7.0	8.0
S_D/S₁	1.0	4.0	6.7	8.9	10.2
γ_D/γ₁	1.0	2.77	4.10	4.60	4.65
Γ	61.8	82.6	90.4	92.8	92.9

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Optics Letters