The accuracy of such a locator depends on the laser pulse duration
and the resolution of the device's receiver that detects the returning pulse.
If the laser pulse duration
[tau]<[[tau].sub.th], the thermal energy cannot be diffused to penetration depth so that the thermal effects would be negligible, if [tau]>[[tau].sub.th] heat can be diffuse up to the optical penetration depth than thermal effects or damages have been possible.
Furthermore, in the case where the laser pulse duration
is much shorter than the rise time, i.e., [[tau].sub.p] [much less than] [[tau].sub.r]
Although the optical absorbance of skin pigment and hemoglobin is not as high as that for hemozoin (23,24) and is not sufficient to generate vapor nanobubbles under the laser pulse duration
and fluence used (29), the bulk transient heat released by hemoglobin and melanin generates a background acoustic trace, which limits the signal-to-noise ratio for the H-VNB method and thus increases the detection threshold for malaria infection.
(24, 25) Such experiments are characterized in terms of the self-modulated wakefield regime, (26) where laser power should be higher than the critical power for relativistic self-focusing and the laser pulse duration
is longer than the plasma period.
On the other hand, the ability to control precisely the laser pulse duration
, repetition rate, and energy content are engineering tasks which need more development effort before the laser can be employed on a production basis for this type of application.
The influence of laser power and the freguency of pulse generation on the surface treatment area (laser spot diameter of 0.3 mm, laser pulse duration
of 6 ms, treatment time of 3 s)
The effects of laser pulse duration
on laser-induced damage in different materials are similar which points to properties of laser-induced damage which are material independent and give insight to the underlying physics of laser-induced damage .
When users need to measure against a shiny surface, for example, they ideally require a sensor that is able to automatically adjust the laser pulse duration
(or laser on time) of the sensor to give them the optimum exposure time on the CCD for that particular surface.
where the constants characterize this laser pulse are: I0, the laser intensity, R the reflectivity of the irradiated surface of the medium, [phi] the absorption depth, and [t.sub.p] the laser pulse duration
. The Cartesian coordinates (x; y; z) are considered and z-axis pointing vertically into the medium.
The time delayed average windowed (5ps), electro-optic sampled data are a cross-correlation between the electrical signal on the line and the laser pulse duration