What are the difference to laser pulsing or continues wave laser in the Z-scan technique (set up )?
The main difference is that when you use a CW laser, if the sample has any absorption, you will heat the sample, and a change of temperature produces a change in refractive index. Therefore, you will be measuring a thermally induced nonlinearity, which are usually large (can be observed with only a few mW powers) and respond fairly slow (micro to milliseconds). Pulse lasers (ps-fs) on the other hand, allow observing fast responding electronic nonlinearities, but care has to be taken to avoid the presence of thermal contributions, particularly with the relatively long ns pulses
Thank dear colleague, Raul Rangel-Rojo
for this your reply
regards
Raad
I have meant the measurement of the third susceptibility can be by means of pulsing laser only and why?
You can use both CW laser as well as pulsed laser for the measurement of third order susceptibility. In CW laser thermal effects will be a significant factor
Raad Shaker Alnayli
Dear Nikhil P P
Thank very much , but I have thought that in the cw laser there powers are not enough for electronics transitions
regards
Raad
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