Absorption coefficients and scattering losses of TGG, TGP, KTF, FS, and CeF<sub>3</sub> magneto-optical crystals in the visible via cavity ring-down spectroscopy

Michalis Xygkis; Michalis Xygkis; Artemis N. Linaraki; Artemis N. Linaraki; Eirini N. Toutoudaki; Eirini N. Toutoudaki; Georgios E. Katsoprinakis; T. Peter Rakitzis; T. Peter Rakitzis

doi:10.1364/AO.496780

Applied Optics
Vol. 62,
Issue 29,
pp. 7730-7735
(2023)
•https://doi.org/10.1364/AO.496780

Absorption coefficients and scattering losses of TGG, TGP, KTF, FS, and CeF₃ magneto-optical crystals in the visible via cavity ring-down spectroscopy

Michalis Xygkis, Artemis N. Linaraki, Eirini N. Toutoudaki, Georgios E. Katsoprinakis, and T. Peter Rakitzis

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Michalis Xygkis, Artemis N. Linaraki, Eirini N. Toutoudaki, Georgios E. Katsoprinakis, and T. Peter Rakitzis, "Absorption coefficients and scattering losses of TGG, TGP, KTF, FS, and CeF₃ magneto-optical crystals in the visible via cavity ring-down spectroscopy," Appl. Opt. 62, 7730-7735 (2023)

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- Optical Devices, Sensors, and Detectors
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About this Article
History
- Original Manuscript: May 30, 2023
- Revised Manuscript: September 20, 2023
- Manuscript Accepted: September 20, 2023
- Published: October 6, 2023

Abstract

We demonstrate a method for determining small absorption coefficients and surface-scattering losses of crystals using cavity ring-down spectroscopy and perform measurements on magneto-optical crystals of terbium gallium garnet (TGG), terbium gallium phosphate (TGP), fused silica (FS), potassium terbium fluoride (KTF), and ${{\rm CeF}_3}$ at 532 and 634 nm. Surface scattering is distinguished from absorption losses by using crystals of different lengths. A figure of merit (FoM) for magneto-optical crystals is defined to evaluate their suitability as intracavity optics in optical cavity applications. It is found that TGP has the highest FoM for crystal lengths up to ${\sim}{10}\;{\rm mm}$, whereas ${{\rm CeF}_3}$ and FS potentially outperform TGP for longer crystals. Single-pass applications are also briefly discussed.

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			Single Pass Losses, $L_{s p}$		Absorption Coefficient, $κ$ ( ${c m}^{- 1}$ )
Crystal	Verdet ct. ( $r a d / T \cdot m$ ) at 532 nm	Crystal Length (mm)	at 532 nm	at 634 nm	at 532 nm	at 634 nm
TGG	198	3	$0.0105 \pm 0.0004$	$0.0077 \pm 0.0004$	$0.0289 \pm 0.0003$	$0.0198 \pm 0.0003$
		20	$0.0580 \pm 0.0004$	$0.0405 \pm 0.0004$	$S = 0.18 %$	$S = 0.18 %$
TGP	106	20	$0.0082 \pm 0.0003$	$0.0075 \pm 0.0002$	$0.0035 \pm 0.0003$	$0.0033 \pm 0.0003$
		3	$0.0022 \pm 0.0005$	$0.0019 \pm 0.0004$	$S = 0.11 %$	$S = 0.09 %$
KTF	$107$	$20$	$0.0388 \pm 0.0005$	$0.0322 \pm 0.0007$	$0.0192 \pm 0.0003$	$0.0158 \pm 0.0004$
					$S = 0.12 %$	$S = 0.097 %$
Fused silica	7	20	$0.0012 \pm 0.0001$	$0.00097 \pm 0.00008$	$\sim 10^{- 5}$ [37]	$\sim 10^{- 5}$ [37]
					$S = 0.12 %$	$S = 0.097 %$
$Ce F_{3}$	171	2.2	$0.007 \pm 0.0005$	$0.007 \pm 0.0005$	$0 < κ < 0.004$ ^b	$0 < κ < 0.004$ ^b
		6.2	$0.007 \pm 0.0005$	$0.007 \pm 0.0005$	$0.7 % > S > 0.53 %$	$0.7 % > S > 0.53 %$

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