Direct observation of ultraviolet laser induced photocurrent in oxygen deficient silica and germanosilicate glasses

Баграташвили, В. Н.; Tsypina, S. I.; Chernov, P. V.; Рыбалтовский, А. О.; Zavorotny, Yuriy S.; Alimpiev, S. S.; Simanovskii, Yaroslav O.; Dong, Liang; Russel, P.St.J.

doi:10.1063/1.115669

Cited by 17 publications

(9 citation statements)

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“…The problem is that for wavelengths much shorter than 350 nm, the radiation damages and/or charges UV-fused silica, see [4] and, e.g., [10,82]. These issues will have to be further investigated.…”

Section: Comparison Of Quantum Theory and Macrorealistic Modelsmentioning

confidence: 99%

Macroscopic quantum resonators (MAQRO)

Hechenblaikner²,

et al. 2012

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Quantum physics challenges our understanding of the nature of physical reality and of space-time and suggests the necessity of radical revisions of their underlying concepts. Experimental tests of quantum phenomena involving massive macroscopic objects would provide novel insights into these fundamental questions. Making use of the unique environment provided by space, MAQRO aims at investigating this largely unexplored realm of macroscopic quantum physics. MAQRO has originally been proposed as a medium-sized fundamental-science space mission for the 2010 call of Cosmic Vision. MAQRO unites two experiments: DECIDE (DECoherence In Double-Slit Experiments) and CASE (Comparative Acceleration Sensing Experiment). The main scientific objective of MAQRO, which is addressed by the experiment DECIDE, is to test the predictions of quantum theory for quantum superpositions of macroscopic objects containing more than 10 8 atoms. Under these conditions, deviations due to various suggested alternative models to quantum theory would become visible. These models have been suggested to harmonize the paradoxical quantum phenomena both with the classical macroscopic world and with our notion of Minkowski space-time. second scientific objective of MAQRO, which is addressed by the experiment CASE, is to demonstrate the performance of a novel type of inertial sensor based on optically trapped microspheres. CASE is a technology demonstrator that shows how the modular design of DECIDE allows to easily incorporate it with other missions that have compatible requirements in terms of spacecraft and orbit. CASE can, at the same time, serve as a test bench for the weak equivalence principle, i.e., the universality of free fall with test-masses differing in their mass by 7 orders of magnitude.

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Section: Comparison Of Quantum Theory and Macrorealistic Modelsmentioning

confidence: 99%

Macroscopic quantum resonators (MAQRO)

Hechenblaikner²,

et al. 2012

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“…The observed photocurrent behavior is qualitatively consistent with the one induced a͒ Author to whom correspondence should be addressed; electronic mail: niko@physics.ucc.ie in earlier experiments on the two-step ionization S 0 → S 1 → S N of oxygen deficient fused silica by KrF excimer laser radiation with = 248 nm and = 25 ns. 11 After poling and removal of the electrodes ͑by etching͒, the sample was tested for evidence of second-harmonic generation. As a source of fundamental radiation, a mode-locked and Q-switched Nd:YAG laser was used ͑ = 1064 nm͒.…”

mentioning

confidence: 99%

Ultraviolet poling of pure fused silica by high-intensity femtosecond radiation

Corbari

Kazansky

Slattery

et al. 2005

Applied Physics Letters

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“…9,12 It was shown directly in Ref. 8, that UV photoexcitation of GODC with intense pulses of KrF laser ( ϭ248 nm, ⌽Ͼ10 Ϫ2 J/cm 2 ͒ in an electric field results in efficient two-quantum ionization of GODC and generation of photocurrent pulses.…”

Section: -11mentioning

confidence: 99%

“…This is why one of the possible approaches to control GODC phototransformation calls for the application of a strong electric field. [9][10][11] It is important that depending on UV light intensity, both one-quantum and two-quantum GODC photodecomposition may occur. 9,12 It was shown directly in Ref.…”

Section: ͓S0003-6951͑00͒01437-6͔mentioning

confidence: 99%

“…[9][10][11] It is important that depending on UV light intensity, both one-quantum and two-quantum GODC photodecomposition may occur. 9,12 It was shown directly in Ref. 8, that UV photoexcitation of GODC with intense pulses of KrF laser ( ϭ248 nm, ⌽Ͼ10 Ϫ2 J/cm 2 ͒ in an electric field results in efficient two-quantum ionization of GODC and generation of photocurrent pulses.…”

Section: ͓S0003-6951͑00͒01437-6͔mentioning

confidence: 99%

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Effect of electric field on one-quantum photodecay of oxygen-deficient centers in germanosilicate fibers

Рыбалтовский

Zavorotny

Chernov

et al. 2000

Applied Physics Letters

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The effect of a strong electric field ͑up to 10 6 V/cm͒ on one-quantum UV photoexcitation and photodecomposition of germanium oxygen deficient centers ͑GODC͒ in twin-hole germanosilicate fibers with internal wire electrodes is reported. The fiber has been irradiated with the UV light of a deuterium lamp and triplet photoluminescence of GODC has been used to monitor the kinetics of its photodecay. Applying such an electric field did not affect the spectral characteristics of GODC but increased the rate of their one-quantum photodecomposition, while direct photoionization and charge separation did not take place. We have also shown that this effect is caused by the suppression of secondary photoinduced recombination processes of intermediates, rather than by acceleration of primary photodecomposition of GODC. © 2000 American Institute of Physics. ͓S0003-6951͑00͒01437-6͔The effect of UV photosensitivity of Ge-doped silica glass is widely used for effective photoinscription of fiber and planar microstructures.1 This effect is recognized to be associated with structural phototransformation of germanium oxygen-deficient centers ͑GODC͒ and local density alteration in a Ge-doped glass network. Exposure of GODC to UV light is produced mostly in 242 nm singlet absorption band (S 0 -S 1 electron transition͒ and also in weak triplet absorption 330 nm band (S 0 -T 1 electron transition͒.2 Singlet photoexcitation of GODC results in the appearance of two luminescence bands-singlet band centered at about 300 nm (S 1 -S 0 transition͒ and triplet band at about 400 nm (T 1 -S 0 transition͒. To increase the photosensitivity of germanosilicate glass the ''chemical'' pathways of UV energy relaxation in GODC should be accelerated.3-5 The mechanisms of GODC chemical phototransformation are very complicated, and they are far from being completely understood. Different parameters of glass such as concentration of Ge 5,6 and other dopants 7 and impregnated molecular species ͑like hydrogen 5,8 ͒, can be critical for these mechanisms. It should be noticed that the mechanism of charge ͑elec-tron or hole͒ displacement has always been considered as an initial step of GODC phototransformation. This is why one of the possible approaches to control GODC phototransformation calls for the application of a strong electric field. 9-11It is important that depending on UV light intensity, both one-quantum and two-quantum GODC photodecomposition may occur. 9,12 It was shown directly in Ref. 8, that UV photoexcitation of GODC with intense pulses of KrF laser ( ϭ248 nm, ⌽Ͼ10 Ϫ2 J/cm 2 ͒ in an electric field results in efficient two-quantum ionization of GODC and generation of photocurrent pulses. It has been observed in similar cases that the effects of a strong electric field on acceleration of both GODC decomposition 10 and formation of Bragg gratings 11 can be quite naturally attributed to the increase of displacement of charge carriers from ionized GODC and, as a result, to the suppression of recombination processes. The effects of a strong electric f...

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Direct observation of ultraviolet laser induced photocurrent in oxygen deficient silica and germanosilicate glasses

Cited by 17 publications

References 0 publications

Macroscopic quantum resonators (MAQRO)

Macroscopic quantum resonators (MAQRO)

Ultraviolet poling of pure fused silica by high-intensity femtosecond radiation

Effect of electric field on one-quantum photodecay of oxygen-deficient centers in germanosilicate fibers

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