The aim of this work is to provide an analytical expression for the thermal diffusivity of a material in the configuration of the picosecond photoreflectance experiment. It is shown that the thermal diffusivity can be estimated from the absorption depth of the pump beam together with the probe beam as well as the time when the two asymptotic behaviors of the impulse response cross. Thereby, it is not required to measure absolute values of incident heat flux and average temperature on the aiming area.

1.
Clemens
,
B. M.
,
et al.
, 1988, “
Time-Resolved Thermal Transport in Compositionally Metal Films
,”
Phys. Rev. B
0163-1829,
37
(
3
), pp.
1085
1096
.
2.
Cahill
,
D. G.
, 2004, “
Analysis of Heat Flow in Layered Structures for Time-Domain Reflectance
,”
Rev. Sci. Instrum.
0034-6748,
75
(
12
), pp.
5119
5122
.
3.
Taketoshi
,
N.
,
et al.
, 2002, “
Thermal Diffusivity Measurement of a Thin Metal Film With a Picosecond Photoreflectance Technique
,”
High Temp. - High Press.
0018-1544,
34
, pp.
19
28
.
4.
Li
,
B.
,
et al.
, 1999, “
Thermal Characterization of Thin Superconducting Films by Modulated Photoreflectance Microscopy
,”
Thin Solid Films
0040-6090,
352
, pp.
91
96
.
5.
Qiu
,
T. Q.
,
et al.
, 1994, “
Femtosecond Laser Heating of Multi-Layer Metals-II. Experiments
,”
Int. J. Heat Mass Transfer
0017-9310,
37
(
17
), pp.
2799
2808
.
6.
Cahill
,
D. G.
,
et al.
, 2003, “
Nanoscale Thermal Transport
,”
J. Appl. Phys.
0021-8979,
93
(
2
), pp.
793
818
.
7.
Stehfest
,
H.
, 1970, “
Algorithm 368. Numerical Inversion on the Laplace Transforms
,”
Commun. ACM
0001-0782,
13
, pp.
47
49
.
You do not currently have access to this content.