Optical assessment on a new self-frequency doubling crystal: neodymium-doped lanthanum calcium borate

Rui Guo; Yicheng Wu; Peizhen Fu; Fangli Jing

doi:10.1364/JOSAB.22.000831

Journal of the Optical Society of America B
Vol. 22,
Issue 4,
pp. 831-834
(2005)
•https://doi.org/10.1364/JOSAB.22.000831

Optical assessment on a new self-frequency doubling crystal: neodymium-doped lanthanum calcium borate

Rui Guo, Yicheng Wu, Peizhen Fu, and Fangli Jing

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Rui Guo, Yicheng Wu, Peizhen Fu, and Fangli Jing, "Optical assessment on a new self-frequency doubling crystal: neodymium-doped lanthanum calcium borate," J. Opt. Soc. Am. B 22, 831-834 (2005)

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Abstract

A new, to our knowledge, neodymium-doped lanthanum calcium borate crystal $({Nd}^{3 +} : {La}_{2} {CaB}_{10} O_{19}, Nd : LCB)$ has been grown by the flux method. The spectroscopic parameters for Nd:LCB crystal have also been calculated based on Judd–Ofelt theory. The intensity parameters $Ω_{t}$ are $Ω_{2} = 4.96 \times 10^{- 20} {cm}^{2},$ $Ω_{4} = 3.94 \times 10^{- 20} {cm}^{2},$ and $Ω_{6} = 3.71 \times 10^{- 20} {cm}^{2} .$ The radiative lifetime $τ_{r}$ is 349 µs. The absorption band at 800 nm has a FWHM of 12 nm. The absorption cross section is $σ_{a} = 2.40 \times 10^{- 20} {cm}^{2},$ and the emission cross sections at 1070 nm are $σ_{X} = 3.02 \times 10^{- 19} {cm}^{2},$ $σ_{Y} = 2.33 \times 10^{- 19} {cm}^{2},$ and $σ_{Z} = 2.68 \times 10^{- 19} {cm}^{2} .$ The measured fluorescence lifetime $τ_{f}$ is 64 µs, and the quantum efficiency η is 18.3%. In comparison with other Nd-doped laser crystals, the calculated parameters show that Nd:LCB crystal satisfies the fundamental spectral condition for laser emission.

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Transitions $^{4} I_{9 / 2} \to$	λ (Å)	$\int OD (λ) d λ$ (Å)	$S_{meas}$ $(10^{- 20} {cm}^{2})$	$S_{cal}$ $(10^{- 20} {cm}^{2})$	$Δ S$	$Δ S^{2}$
$^{4} F_{3 / 2}$	8800	6.83	0.34	1.11	-0.77	0.60
$^{4} F_{5 / 2} +^{2} H_{9 / 2}$	7990	45.50	2.47	2.92	-0.45	0.20
$^{4} F_{7 / 2} +^{4} S_{3 / 2}$	7370	48.70	2.87	2.62	0.25	0.06
$^{4} F_{9 / 2}$	6780	2.20	0.14	0.19	-0.05	0.00
$^{2} H_{11 / 2}$	6250	0.80	0.06	0.05	0.01	0.00
$^{4} G_{5 / 2} +^{2} G_{7 / 2}$	5790	97.80	7.34	7.39	-0.05	0.00
$^{2} K_{13 / 2} +^{4} G_{7 / 2} +^{4} G_{9 / 2}$	5230	28.60	2.38	1.66	0.72	0.51
$^{2} K_{15 / 2} +^{2} G_{9 / 2} +^{2} D_{3 / 2}$	4730	7.66	0.70	0.27	0.43	0.19
$^{2} P_{1 / 2}$	4280	1.95	0.20	0.16	0.04	0.00
$^{4} D_{3 / 2} +^{2} I_{11 / 2} +^{4} D_{5 / 2} +^{4} D_{1 / 2}$	3560	20.40	2.49	2.25	0.24	0.06
$rms - Δ S = 0.31 \times 10^{- 20}$
$Ω_{2} = 4.96 \times 10^{- 20};$ $Ω_{4} = 3.94 \times 10^{- 20};$ $Ω_{6} = 3.71 \times 10^{- 20},$ $X = 1.06$

$^{4} I_{J}$	λ (nm)	$S (10^{- 20} {cm}^{2})$	$A (s^{- 1})$	$β_{c}$	$β_{m}$
$^{4} I_{9 / 2}$	880	1.11	1268.7	0.443	0.44
$^{4} I_{11 / 2}$	1070	2.07	1321.6	0.461	0.46
$^{4} I_{13 / 2}$	1330	0.79	263.9	0.092	0.10
$^{4} I_{15 / 2}$	1880	0.10	12.0	0.004	⋯
$τ_{r} = 349$ µs

Crystals	Concentration $(10^{20} {cm}^{- 3})$	$σ_{a}$ $(10^{- 20} {cm}^{2})$	$τ_{f}$ (µs)	$σ_{e}$ $(10^{- 19} {cm}^{2})$	στ $(10^{- 23} {cm}^{2} s)$
				$σ_{X} = 3.02$	1.9
Nd:LCB	0.6	2.4	64	$σ_{Y} = 2.33$	1.5
				$σ_{Z} = 2.68$	1.7
NYABa	1.9	2.9	60	2.0	1.2
NGABb	2.2	3.5	54	6.3	3.4
Nd:GdCOBc	1.8	1.9	98	0.3	0.3
Nd:YAGd	1.5	7.0	240	3.3	7.9

Transitions $^{4} I_{9 / 2} \to$	λ (Å)	$\int OD (λ) d λ$ (Å)	$S_{meas}$ $(10^{- 20} {cm}^{2})$	$S_{cal}$ $(10^{- 20} {cm}^{2})$	$Δ S$	$Δ S^{2}$
$^{4} F_{3 / 2}$	8800	6.83	0.34	1.11	-0.77	0.60
$^{4} F_{5 / 2} +^{2} H_{9 / 2}$	7990	45.50	2.47	2.92	-0.45	0.20
$^{4} F_{7 / 2} +^{4} S_{3 / 2}$	7370	48.70	2.87	2.62	0.25	0.06
$^{4} F_{9 / 2}$	6780	2.20	0.14	0.19	-0.05	0.00
$^{2} H_{11 / 2}$	6250	0.80	0.06	0.05	0.01	0.00
$^{4} G_{5 / 2} +^{2} G_{7 / 2}$	5790	97.80	7.34	7.39	-0.05	0.00
$^{2} K_{13 / 2} +^{4} G_{7 / 2} +^{4} G_{9 / 2}$	5230	28.60	2.38	1.66	0.72	0.51
$^{2} K_{15 / 2} +^{2} G_{9 / 2} +^{2} D_{3 / 2}$	4730	7.66	0.70	0.27	0.43	0.19
$^{2} P_{1 / 2}$	4280	1.95	0.20	0.16	0.04	0.00
$^{4} D_{3 / 2} +^{2} I_{11 / 2} +^{4} D_{5 / 2} +^{4} D_{1 / 2}$	3560	20.40	2.49	2.25	0.24	0.06
$rms - Δ S = 0.31 \times 10^{- 20}$
$Ω_{2} = 4.96 \times 10^{- 20};$ $Ω_{4} = 3.94 \times 10^{- 20};$ $Ω_{6} = 3.71 \times 10^{- 20},$ $X = 1.06$

$^{4} I_{J}$	λ (nm)	$S (10^{- 20} {cm}^{2})$	$A (s^{- 1})$	$β_{c}$	$β_{m}$
$^{4} I_{9 / 2}$	880	1.11	1268.7	0.443	0.44
$^{4} I_{11 / 2}$	1070	2.07	1321.6	0.461	0.46
$^{4} I_{13 / 2}$	1330	0.79	263.9	0.092	0.10
$^{4} I_{15 / 2}$	1880	0.10	12.0	0.004	⋯
$τ_{r} = 349$ µs

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Journal of the Optical Society of America B

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