Title :
Analysis of the performance of a thermal defocusing optical limiter in the transient regime
Author :
Singh, Manoranjan P. ; Mehendale, S.C.
Author_Institution :
Laser Programme, Centre for Adv. Technol., Indore, India
fDate :
10/1/1998 12:00:00 AM
Abstract :
A theoretical analysis of the performance of a thermal defocusing optical limiter in the transient regime-i.e., when the laser pulse duration is comparable to the acoustic transit time which governs the limiter response-is presented. First, an expression is obtained for the time- and space-dependent refractive index changes induced by a laser pulse in an absorbing liquid. This is used to calculate the nonlinear phase change experienced by the laser pulse while traversing the absorbing medium and then the transmission of the optical limiter. Results on the dependence of the optical limiter´s performance on laser pulse duration are presented in a general form and also by considering a specific example
Keywords :
laser beam effects; laser beams; nonlinear optics; optical focusing; photothermal effects; refractive index; absorbing liquid; absorbing medium; acoustic transit time; laser pulse; laser pulse duration; limiter response; nonlinear phase change; optical limiter performance; space-dependent refractive index changes; thermal defocusing optical limiter; time-dependent refractive index changes; transient regime; transmission; Acoustic pulses; Laser theory; Laser transitions; Nonlinear optics; Optical pulses; Optical refraction; Optical variables control; Performance analysis; Refractive index; Transient analysis;
Journal_Title :
Quantum Electronics, IEEE Journal of
