Recovery speed of photoinduced third-harmonic (TH) generation in azo-copolymer thin films can be controlled by a nanosecond laser excitation. When the excitation is tuned on, the TH signal decreases because of angular hole burning and angular redistribution effects. After turning off the excitation, the TH signal can recover to its original level either within 1min (high intensity excitation) or longer than several days (low intensity excitation). The fast recovery of the TH signal is attributed to the increase of temperature in the sample that causes molecules to more easily reorient and return to the original trans form.

1.
Photoreactive Organic Thin Films
, edited by
Z.
Sekkat
and
W.
Knoll
(
Academic
,
San Diego, CA
,
2002
), and references therein.
2.
M.
Maeda
,
H.
Ishitobi
,
Z.
Sekkat
, and
S.
Kawata
,
Appl. Phys. Lett.
85
,
351
(
2004
).
3.
Z.
Sekkat
and
M.
Dumont
,
Synth. Met.
54
,
373
(
1993
).
4.
Z.
Sekkat
,
D.
Yasumatsu
, and
S.
Kawata
,
J. Phys. Chem. B
106
,
12407
(
2002
).
5.
Z.
Sekkat
,
J.
Wood
,
E. F.
Aust
,
W.
Knoll
,
W.
Volksen
, and
R. D.
Miller
,
J. Opt. Soc. Am. B
13
,
1713
(
1996
).
6.
C.
Fiorini
,
F.
Charra
,
J.-M.
Nunzi
, and
P.
Raimond
,
J. Opt. Soc. Am. B
14
,
1984
(
1997
).
7.
V. M.
Churikov
and
C. C.
Hsu
,
Appl. Phys. Lett.
77
,
2095
(
2000
).
8.
V. M.
Churikov
and
C. C.
Hsu
,
J. Opt. Soc. Am. B
18
,
1722
(
2001
).
9.
S.
Liu
,
J. H.
Lin
,
J. H.
Lin
,
V. M.
Churikov
,
J. T.
Lin
,
T.-H.
Huang
, and
C. C.
Hsu
,
Opt. Commun.
236
,
33
(
2004
).
10.
S.
Liu
,
W. L.
Wang
,
C. C.
Fang
,
T.-H.
Huang
, and
C. C.
Hsu
,
J. Appl. Phys.
97
,
013103
(
2005
).
11.
C. C.
Hsu
,
J. H.
Lin
,
T.-H.
Huang
, and
K.
Harada
,
Appl. Phys. Lett.
82
,
2440
(
2003
).
12.
Z.
Sekkat
,
H.
Ishitobi
, and
S.
Kawata
,
Opt. Commun.
222
,
269
(
2003
).
13.
N. D.
Lai
,
W. L.
Wang
,
J. H.
Lin
, and
C. C.
Hsu
,
Appl. Phys. B
B80
,
569
(
2005
).
14.
N.
Tsutsumi
and
A.
Fujihara
,
Appl. Phys. Lett.
85
,
4582
(
2004
).
15.
T.-S.
Chung
,
J. Appl. Phys.
60
,
55
(
1986
).
16.
M.
Bolle
and
S.
Lazare
,
J. Appl. Phys.
73
,
3516
(
1993
).
17.
P.
Rochon
,
E.
Batalla
, and
A.
Natansohn
,
Appl. Phys. Lett.
66
,
136
(
1995
).
18.
D. Y.
Kim
,
S. K.
Tripathy
,
L.
Li
, and
J.
Kumar
,
Appl. Phys. Lett.
66
,
1166
(
1995
).
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