Reversible and irreversible alterations of the optical thickness of PQ/PMMA volume recording media samples. Part I: Experiment

B. G. Manukhin; S. A. Chivilikhin; I. J. Schelkanova; N. V. Andreeva; D. A. Materikina; O. V. Andreeva

doi:10.1364/AO.56.007351

Applied Optics
Vol. 56,
Issue 26,
pp. 7351-7357
(2017)
•https://doi.org/10.1364/AO.56.007351

Reversible and irreversible alterations of the optical thickness of PQ/PMMA volume recording media samples. Part I: Experiment

B. G. Manukhin, S. A. Chivilikhin, I. J. Schelkanova, N. V. Andreeva, D. A. Materikina, and O. V. Andreeva

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B. G. Manukhin, S. A. Chivilikhin, I. J. Schelkanova, N. V. Andreeva, D. A. Materikina, and O. V. Andreeva, "Reversible and irreversible alterations of the optical thickness of PQ/PMMA volume recording media samples. Part I: Experiment," Appl. Opt. 56, 7351-7357 (2017)

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Abstract

Experimental research into changes of the optical thickness of phenanthrenequinone-doped polymethyl methacrylate samples in the process of irradiation by a 473 nm laser is presented. It was demonstrated that heating-induced reversible changes lead to a decrease in the optical thickness. The temperature coefficient of the relative changes of the optical thickness was measured to be $- 1.40 \times 10^{- 5} К^{- 1}$ , which matches the data published by other authors. It is also established that the irreversible changes induced by the photochemical transformation lead to an increase in the optical thickness outside of the absorption band of the samples ( $λ > 530 nm$ ), where the relative change of which at $λ = 532 nm$ is $+ 3.7 \times 10^{- 5}$ . It was demonstrated that the reversible and irreversible changes do not compensate for each other in the process of sample exposure.

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Exposure, H, $J / {cm}^{2}$	$Δ {(n l)}^{PQ / PP} / n l$ ; $Δ {(n)}^{PQ / PP} / n$
0.33	$+ (0.24 \pm 0.06) \times 10^{- 5}$
1.0	$+ (0.78 \pm 0.14) \times 10^{- 5}$
6.6	$+ (3.10 \pm 0.15) \times 10^{- 5}$
19.8	$+ (3.70 \pm 0.03) \times 10^{- 5}$

Probe Radiation, $λ$ , nm		532	633	1550
$Δ {(n l)}^{PQ / PP} / n l$ ; $Δ {(n)}^{PQ / PP} / n$		$+ 3.7 \times 10^{- 5}$	$+ 4.8 \times 10^{- 5}$	$+ 2.9 \times 10^{- 5}$ [21]
Irradiation	$λ$ , nm	473	473	530
	H, $J / {cm}^{2}$	19.8	143	15.4

$Δ {(n l)}^{Σ} / n l$	$Δ {(n l)}^{PQ / PP} / n l$	$Δ {(n l)}^{T} / n l$	$Δ T$ , К	$χ$ , $К^{- 1}$
$- 3.3 \times 10^{- 5}$	$+ 3.7 \times 10^{- 5}$	$- 7.0 \times 10^{- 5}$	$5,0 \pm 0.5$	$- (1.40 \pm 0.15) \times 10^{- 5}$

Material (Brand)	$α$ , $10^{- 5} \times К^{- 1}$	$β$ , $10^{- 5} \times К^{- 1}$	$χ = α + β$ , $10^{- 5} \times К^{- 1}$	Reference
PMMA	3.6–6.5	−7.0	$- (0.5 - 3.4)$	[13]
PQ/PMMA	–	–	−0.3	[21]
PQ/PMMA	12.2	−14	−1.8	[19]
PMMA	7.0	−7.72	−0.72	[27]
PMMA (Plexiglass 55)	6.79	−7.05	−0.26	[28]
Experimental Results of the Authors of this Paper
PQ/PMMA	$+ 9.3$	−10.7	−1.40

Exposure, H, $J / {cm}^{2}$	$Δ {(n l)}^{PQ / PP} / n l$ ; $Δ {(n)}^{PQ / PP} / n$
0.33	$+ (0.24 \pm 0.06) \times 10^{- 5}$
1.0	$+ (0.78 \pm 0.14) \times 10^{- 5}$
6.6	$+ (3.10 \pm 0.15) \times 10^{- 5}$
19.8	$+ (3.70 \pm 0.03) \times 10^{- 5}$

Abstract

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Applied Optics