Characterization and extinction measurement of potassium terbium fluoride single crystal for high laser power applications

Amir A. Jalali; Evan Rogers; Kevin Stevens

doi:10.1364/OL.42.000899

Characterization and extinction measurement of potassium terbium fluoride single crystal for high laser power applications

Amir A. Jalali, Evan Rogers, and Kevin Stevens

Optics Letters
Vol. 42,
Issue 5,
pp. 899-902
(2017)
•https://doi.org/10.1364/OL.42.000899

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Amir A. Jalali, Evan Rogers, and Kevin Stevens, "Characterization and extinction measurement of potassium terbium fluoride single crystal for high laser power applications," Opt. Lett. 42, 899-902 (2017)

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Table of Contents Category
- Materials
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Magneto-optical materials (160.3820)
- Isolators (230.3240)
- Crystal optics (260.1180)

About this Article
History
- Original Manuscript: December 23, 2016
- Revised Manuscript: January 26, 2017
- Manuscript Accepted: January 30, 2017
- Published: February 17, 2017

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Abstract

High optical quality of potassium terbium fluoride, ${KTb}_{3} F_{10}$ (KTF), crystals are characterized and tested for extinction at high laser powers up to 400 W. The measured Verdet constant of the crystal is comparable with that of terbium gallium garnet (TGG) crystal. KTF crystals show high extinction at high incident power and an order of magnitude smaller absorption with respect to TGG, making it a superior crystal for high laser power applications.

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Crystal	KTF	TGG
Absorption (ppm/cm) at 1064 nm	$\sim 150$	$\sim 3000$
Verdet (rad/T m) at 1064 nm	34	38.5
Refractive index at 1064 nm	1.50	1.94
Thermal conductivity (W/m K)	1.67	7.4
Thermal expansion $\times 10^{- 6} (1 /^{°} C)$	13.7	7.3

Sample	Crystal	$\| ξ \|$	$α \| Q \|$ $\times 10^{- 9} (1 / cm K)$
1	KTF[100]	4.7	0.38
2	KTF[100]	4.9	0.27
3	KTF[111]	–	0.40
4	KTF[111]	–	0.37
5	TGG[111]	2.20	5.02

Crystal	KTF	TGG
Absorption (ppm/cm) at 1064 nm	$\sim 150$	$\sim 3000$
Verdet (rad/T m) at 1064 nm	34	38.5
Refractive index at 1064 nm	1.50	1.94
Thermal conductivity (W/m K)	1.67	7.4
Thermal expansion $\times 10^{- 6} (1 /^{°} C)$	13.7	7.3

Sample	Crystal	$\| ξ \|$	$α \| Q \|$ $\times 10^{- 9} (1 / cm K)$
1	KTF[100]	4.7	0.38
2	KTF[100]	4.9	0.27
3	KTF[111]	–	0.40
4	KTF[111]	–	0.37
5	TGG[111]	2.20	5.02

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