Blackbody absorption efficiencies for six lamp pumped Nd laser materials

Patricia L. Cross; Norman P. Barnes; Milton W. Skolaut; Mark E. Storm

doi:10.1364/AO.29.000791

Applied Optics
Vol. 29,
Issue 6,
pp. 791-797
(1990)
•https://doi.org/10.1364/AO.29.000791

Blackbody absorption efficiencies for six lamp pumped Nd laser materials

Patricia L. Cross, Norman P. Barnes, Milton W. Skolaut, and Mark E. Storm

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Patricia L. Cross, Norman P. Barnes, Milton W. Skolaut, and Mark E. Storm, "Blackbody absorption efficiencies for six lamp pumped Nd laser materials," Appl. Opt. 29, 791-797 (1990)

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Abstract

Utilizing high resolution spectra, the absorption efficiency for six Nd laser materials was calculated as functions of the effective blackbody temperature of the lamp and laser crystal size. The six materials were Nd:YAG, Nd:YLF, Nd:Q-98 Glass, Nd:YVO₄, Nd:BEL, and Nd:Cr:GSGG. Under the guidelines of this study, Nd:Cr:GSGG’s absorption efficiency is twice the absorption efficiency of any of the other laser materials.

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Crystal geometry	Pump angular distribution	Calculated absorption efficiency 5800 K
Rod	Uniform	0.11023
Rod	Lambertian	0.11031
Rod	Sym. Gaussian	0.11042
Rod	Asym. Gaussian	0.11042
Slab	Uniform	0.08535
Slab	Lambertian	0.08403
Slab	Sym. Gaussian	0.08108
Slab	Asym. Gaussian	0.08108

Material	Calculated na (3200 K)	Measured σs (cw)	Ratio
Nd:YAG	0.0230	0.0072	3.20
Nd:YLF	0.0125	0.0044	2.84

Material	Calculated na (5800 K)	Measured σsm (NM)	Ratio
Nd:YAG	0.0578	0.0234	2.47
Nd:YLF	0.0340	0.0137	2.48
Nd:BEL	0.0879	0.0250	3.52
Nd:Cr:GSGG	0.1825	0.0411	4.44

Laser material and axis	Maximum abs. coeff. per mm	λ_peak (μm)	Range of spectra (μm)
Nd:BEL x	203	0.8106	0.300–0.830
Nd:BEL y	123	0.8105	0.300–0.830
Nd:BEL z	158	0.8105	0.300–0.830
Nd:Cr:GSGG	82	0.5882	0.325–0.830
Nd:Glass	31	0.5826	0.325–0.830
Nd:YAG	159	0.5885	0.325–0.830
Nd:YLF A	34	0.7328	0.325–0.830
Nd:YLF C	107	0.7916	0.325–0.830
Nd:YVO₄A	140	0.5894	0.400–0.830
	110	0.8086	0.400–0.830
Nd:YVO₄C	178	0.5944	0.400–0.830
	227	0.8086	0.400–0.830

Laser material	Rod rad. * conc. = 0.10 mm			Rod rad. * conc. = 0.10 mm
Laser material	3200K	5800K	9500K	3200K	5800K	9500K
Nd:BEL	0.066	0.147	0.133	0.104	0.256	0.242
Nd:Cr:GSGG	0.105	0.263	0.233	0.122	0.299	0.267
Nd:Glass	0.044	0.088	0.072	0.091	0.201	0.168
Nd:YAG	0.055	0.110	0.090	0.100	0.232	0.202
Nd:YLF	0.036	0.073	0.058	0.086	0.182	0.158
Nd:YVO₄	0.056	0.114	0.085	0.105	0.235	0.187

Laser material	Maximum abs. eff.	Bb temp. (K) at max. abs. eff.
Nd:BEL	0.067	6100
Nd:Cr:GSGG	0.147	6800
Nd:Glass	0.031	5900
Nd:YAG	0.041	5800
Nd:YLF	0.023	5800
Nd:YVO₄	0.051	5700

Abstract

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Equations (5)

Applied Optics