Crystal growth, spectroscopy, and laser performance of Nd<sup>3+</sup>:KYF<sub>4</sub>

Toomas H. Allik; Larry D. Merkle; Richard A. Utano; Bruce H. T. Chai; J.-L. V. Lefaucheur; Heika Voss; G. Jeffrey Dixon

doi:10.1364/JOSAB.10.000633

Journal of the Optical Society of America B
Vol. 10,
Issue 4,
pp. 633-637
(1993)
•https://doi.org/10.1364/JOSAB.10.000633

Crystal growth, spectroscopy, and laser performance of Nd³⁺:KYF₄

Toomas H. Allik, Larry D. Merkle, Richard A. Utano, Bruce H. T. Chai, J.-L. V. Lefaucheur, Heika Voss, and G. Jeffrey Dixon

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Toomas H. Allik, Larry D. Merkle, Richard A. Utano, Bruce H. T. Chai, J.-L. V. Lefaucheur, Heika Voss, and G. Jeffrey Dixon, "Crystal growth, spectroscopy, and laser performance of Nd³⁺:KYF₄," J. Opt. Soc. Am. B 10, 633-637 (1993)

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Abstract

Nd³⁺-doped KYF⁴ boules (5 cm long by 2 cm diameter) have been grown by the top-seeded solution method. The broad absorption spectra near 800 nm and the long (>500 μs) fluorescence lifetime of the ⁴F_3/2 laser state in this host are attractive diode-pump features with advantages over Nd³⁺:Y₃Al₅O₁₂ and Nd³⁺:YLF₄. We have investigated cw and Q-switched operation of Nd³⁺:KYF₄ end pumped by a Ti: sapphire laser. Absorbed power slope efficiencies of 30% have been measured, but thermal effects limit input powers to 300 mW into the crystal.

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Excited Manifold	$\bar{λ}$ (nm)	Γ (nm/cm)	S_meas (10⁻²⁰ cm²)	S_calc (10⁻²⁰ cm²)
⁴F_3/2	867	11.9	0.65	0.76
⁴F_5/2, ²H_9/2	798	45.7	2.71	2.63
⁴F_7/2, ⁴S_9/2	737	40.0	2.59	2.70
⁴F_9/2	679	2.4	0.17	0.18
²H_11/2	625	0.5	0.04	0.05
⁴G_5/2, ²G_7/2	578	30.5	2.49	2.52
⁴G_7/2, ²G_9/2, ²K_13/2	520	14.3	1.29	0.87
⁴G_9/2, ⁴G_11/2, ²D_3/2	466	3.5	0.35	0.40
⁴P_1/2, ²D_5/2	429	0.7	0.08	0.11
⁴P_3/2	379	0.3	0.04	0.01
⁴D_1/2,3/2,5/2, ²I_11/2, ²L_15/2	351	11.1	1.47	1.55
⁴D_7/2, ²I_13/2, ²L_17/2	328	1.5	0.21	0.06

Characteristic	Value
Judd–Ofelt parametres	Ω₂ = 0.86 × 10⁻²⁰ cm²
	Ω₄ = 2.39 × 10⁻²⁰ cm²
	Ω₆ = 3.93 × 10⁻²⁰ cm²
⁴F_3/2 Radiative lifetime	714 μs
Branching rations
⁴F_3/2 → ⁴I_9/2	0.354
⁴F_3/2 → ⁴I_11/2	0.525
⁴F_3/2 → ⁴I_13/2	0.116
⁴F_3/2 → ⁴I_15/2	0.005

Excited Manifold	$\bar{λ}$ (nm)	Γ (nm/cm)	S_meas (10⁻²⁰ cm²)	S_calc (10⁻²⁰ cm²)
⁴F_3/2	867	11.9	0.65	0.76
⁴F_5/2, ²H_9/2	798	45.7	2.71	2.63
⁴F_7/2, ⁴S_9/2	737	40.0	2.59	2.70
⁴F_9/2	679	2.4	0.17	0.18
²H_11/2	625	0.5	0.04	0.05
⁴G_5/2, ²G_7/2	578	30.5	2.49	2.52
⁴G_7/2, ²G_9/2, ²K_13/2	520	14.3	1.29	0.87
⁴G_9/2, ⁴G_11/2, ²D_3/2	466	3.5	0.35	0.40
⁴P_1/2, ²D_5/2	429	0.7	0.08	0.11
⁴P_3/2	379	0.3	0.04	0.01
⁴D_1/2,3/2,5/2, ²I_11/2, ²L_15/2	351	11.1	1.47	1.55
⁴D_7/2, ²I_13/2, ²L_17/2	328	1.5	0.21	0.06

Characteristic	Value
Judd–Ofelt parametres	Ω₂ = 0.86 × 10⁻²⁰ cm²
	Ω₄ = 2.39 × 10⁻²⁰ cm²
	Ω₆ = 3.93 × 10⁻²⁰ cm²
⁴F_3/2 Radiative lifetime	714 μs
Branching rations
⁴F_3/2 → ⁴I_9/2	0.354
⁴F_3/2 → ⁴I_11/2	0.525
⁴F_3/2 → ⁴I_13/2	0.116
⁴F_3/2 → ⁴I_15/2	0.005

Abstract

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Figures (6)

Tables (2)

Equations (3)

Journal of the Optical Society of America B