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

Direct observation of ultraviolet laser induced photocurrent in oxygen deficient silica and germanosilicate glasses
Direct observation of ultraviolet laser induced photocurrent in oxygen deficient silica and germanosilicate glasses
UV laser induced ionization of silicon oxygen deficient centers (SODC) in silica glasses and germanium oxygen deficient centers (GODC) in germanosilicate glasses has been studied by direct displacement photocurrent measurements. For both SODC and GODC the two‐photon (two‐step) nature of photoionization has been established. The cross sections of transitions from first excited to upper (ionizable) states were estimated as σ12 = 6×10−18 cm2 for SODC and (0.5–1.0)×10−19 cm2 for GODC. The effect of pulse‐to‐pulse degradation of the photocurrent signal caused by the screening effect is applied to estimate the lifetimes and ranges of the free carriers. The conclusion was drawn, that ionized SODC and GODC play the key role for free charge trapping.
0003-6951
Bagratashvili, V.N.
aaee958a-7cc8-415e-ab28-1ef0cca4dbf3
Tsypina, S.I.
f9802189-0c7d-48d6-a023-ca053de5f82d
Chernov, P.V.
328936fd-34d4-4320-977a-b5beac2e0241
Rybaltovskii, A.O.
44dcfeb9-05d6-4603-b043-f0451236e13c
Zavorotny, Y.V.
67c06ff6-63be-4499-ba82-ad1e0ada8efa
Alimpiev, S.S.
d0349b8e-7b34-42e0-819e-bc046f1ae0f1
Simanovskii, Y.O.
4605128d-fb34-480b-adc0-1275b05d74de
Dong, Liang
c8314915-7a9a-49ab-b91e-0bdf36a5d6bd
Russell, P.St. J.
c068e0f5-0a16-4924-84b2-0280220de8eb
Bagratashvili, V.N.
aaee958a-7cc8-415e-ab28-1ef0cca4dbf3
Tsypina, S.I.
f9802189-0c7d-48d6-a023-ca053de5f82d
Chernov, P.V.
328936fd-34d4-4320-977a-b5beac2e0241
Rybaltovskii, A.O.
44dcfeb9-05d6-4603-b043-f0451236e13c
Zavorotny, Y.V.
67c06ff6-63be-4499-ba82-ad1e0ada8efa
Alimpiev, S.S.
d0349b8e-7b34-42e0-819e-bc046f1ae0f1
Simanovskii, Y.O.
4605128d-fb34-480b-adc0-1275b05d74de
Dong, Liang
c8314915-7a9a-49ab-b91e-0bdf36a5d6bd
Russell, P.St. J.
c068e0f5-0a16-4924-84b2-0280220de8eb

Bagratashvili, V.N., Tsypina, S.I., Chernov, P.V., Rybaltovskii, A.O., Zavorotny, Y.V., Alimpiev, S.S., Simanovskii, Y.O., Dong, Liang and Russell, P.St. J. (1996) Direct observation of ultraviolet laser induced photocurrent in oxygen deficient silica and germanosilicate glasses. Applied Physics Letters, 68 (12), [1616]. (doi:10.1063/1.115669).

Record type: Article

Abstract

UV laser induced ionization of silicon oxygen deficient centers (SODC) in silica glasses and germanium oxygen deficient centers (GODC) in germanosilicate glasses has been studied by direct displacement photocurrent measurements. For both SODC and GODC the two‐photon (two‐step) nature of photoionization has been established. The cross sections of transitions from first excited to upper (ionizable) states were estimated as σ12 = 6×10−18 cm2 for SODC and (0.5–1.0)×10−19 cm2 for GODC. The effect of pulse‐to‐pulse degradation of the photocurrent signal caused by the screening effect is applied to estimate the lifetimes and ranges of the free carriers. The conclusion was drawn, that ionized SODC and GODC play the key role for free charge trapping.

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Published date: 1996

Identifiers

Local EPrints ID: 440942
URI: http://eprints.soton.ac.uk/id/eprint/440942
ISSN: 0003-6951
PURE UUID: ad322d11-2181-4725-a861-c2c2cfa7224c

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Date deposited: 22 May 2020 16:40
Last modified: 16 Mar 2024 07:58

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Contributors

Author: V.N. Bagratashvili
Author: S.I. Tsypina
Author: P.V. Chernov
Author: A.O. Rybaltovskii
Author: Y.V. Zavorotny
Author: S.S. Alimpiev
Author: Y.O. Simanovskii
Author: Liang Dong
Author: P.St. J. Russell

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