interferometric studies of thermal effects
of diode-pumped solid state lasing medium
Peng, Xiaoyuan; Asundi,
Anand K.; Xu, Lei; Chen, Yihong
Xiong, Zhenjun; Lim, Gnian Cher
AD(Gintic Institute of Manufacturing Technology)
Proc. SPIE Vol. 3929, p. 193-198, Solid State Lasers IX, Richard
Publication Date: 04/2000
Thermal effects dramatically influence
the laser performance of diode-pumped solid state lasers (DPSSL).
There are three factors accounting for thermal effects in
diode-pumped laser medium: the change of the refractive index due
to temperature gradient, the change of the refractive index due
to thermal stress, and the change of the physical length due to
thermal expansion (end effect), in which the first two effects
can be called as thermal parts. A laser interferometer is
proposed to measure both the bulk and physical messages of
solid-state lasing medium. There are two advantages of the laser
interferometry to determine the thermal lensing effect. One is
that it allows separating the average thermal lens into thermal
parts and end effect. Another is that the laser interferometry
provides a non-invasive, full field, high-resolution means of
diagnosing such effects by measuring the optical path difference
induced by thermal loading in a lasing crystal reliable without
disturbing the normal working conditions of the DPSS laser.
Relevant measurement results are presented in this paper.
©2000 SPIE--The International Society for Optical Engineering.