Prior-damage dynamics in a high-finesse optical enhancement cavity

Huan Wang; Huan Wang; Loïc Amoudry; Kevin Cassou; Ronic Chiche; Jérôme Degallaix; Kevin Dupraz; Wenhui Huang; Aurélien Martens; Christophe Michel; Hugues Monard; Daniele Nutarelli; Laurent Pinard; Chuanxiang Tang; Lixin Yan; Fabian Zomer

doi:10.1364/AO.410407

Applied Optics
Vol. 59,
Issue 35,
pp. 10995-11002
(2020)
•https://doi.org/10.1364/AO.410407

Prior-damage dynamics in a high-finesse optical enhancement cavity

Huan Wang, Loïc Amoudry, Kevin Cassou, Ronic Chiche, Jérôme Degallaix, Kevin Dupraz, Wenhui Huang, Aurélien Martens, Christophe Michel, Hugues Monard, Daniele Nutarelli, Laurent Pinard, Chuanxiang Tang, Lixin Yan, and Fabian Zomer

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Huan Wang, Loïc Amoudry, Kevin Cassou, Ronic Chiche, Jérôme Degallaix, Kevin Dupraz, Wenhui Huang, Aurélien Martens, Christophe Michel, Hugues Monard, Daniele Nutarelli, Laurent Pinard, Chuanxiang Tang, Lixin Yan, and Fabian Zomer, "Prior-damage dynamics in a high-finesse optical enhancement cavity," Appl. Opt. 59, 10995-11002 (2020)

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Table of Contents Category
- Lasers, Optical Amplifiers, and Laser Optics
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About this Article
History
- Original Manuscript: September 22, 2020
- Revised Manuscript: November 5, 2020
- Manuscript Accepted: November 6, 2020
- Published: December 3, 2020

Abstract

An observation of prior-damage behavior inside a high-finesse optical resonator is reported. Intra-cavity average power drops appeared with magnitude and time scale depending on the power level. Increasing further the incident laser beam power led to irreversible damage of the cavity coupling mirror surface. The origin of this phenomenon is investigated with post mortem mirror surface imaging and analysis of the signals reflected and transmitted by the enhancement cavity. Scattering losses induced by surface deformation due to a hot-spot surface contaminant is found to be most likely the dominant physics process behind this phenomenon.

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Mirror	$M_{1}$	$M_{2}$	$M_{3}$	$M_{4}$
Type	Planar	Planar	Concave	Concave
Substrate material	Suprasil	ULE	ULE	ULE
Transmission (ppm)	180	3	3	3
Absorption (ppm)	1.0	1.1	1.2	1.2
Scattering (ppm)	9.0	5.0	4.3	4.3

$P_{i n}$ (W)	1.5	2.9	5.1	7.9	16.4	28.7
$P_{c, i}$ (kW)	5.6	11.1	18.9	29.2	58.1	6.1
$P_{c, f}$ (kW)	5.4	9.9	15.5	20.6	31.6	5.7
$Δ$ (%)	3.6	11	18	30	46	6
$P_{r, i}$ (W)	0.5	1.1	1.9	3.0	6.8	19.9
$P_{r, f}$ (W)	0.5	1.1	1.9	3.0	7.2	20.7
$t_{1 / 2}$ (ms)	57	41	25	15	7	60
$G_{c, i}$	3800	3800	3700	3700	3500	210

$P_{i n}$ (W)	1.5	2.9	5.1	7.9	16.4
${R T L}_{i}$ (ppm)	350	350	360	360	360
${R T L}_{f}$ (ppm)	350	370	390	420	470
$\| c_{00, i} \|^{2}$ (%)	65	65	65	65	62
$\| c_{00, f} \|^{2}$ (%)	64	64	64	63	59
$F_{i}$	18,000	18,000	18,000	18,000	18,000
$F_{f}$	18,000	17,000	16,000	15,000	13,000

$r_{s} (µ m)$	$α_{-} (p p m)$	$α_{+} (p p m)$
25	2	2.8
100	2.3	3.3
150	2.6	4
175	2.9	4.5
200	3.2	5

Mirror	$M_{1}$	$M_{2}$	$M_{3}$	$M_{4}$
Type	Planar	Planar	Concave	Concave
Substrate material	Suprasil	ULE	ULE	ULE
Transmission (ppm)	180	3	3	3
Absorption (ppm)	1.0	1.1	1.2	1.2
Scattering (ppm)	9.0	5.0	4.3	4.3

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Applied Optics