I have gone through many research paper and now confused with laser power density and laser energy density and which is more significant to use.
laser energy density= laser power/( scan speed x track width); (j/cm2)
laser power density = laser power/spot area (W/cm2)
Laser power density (usually called "intensity") is important in nonlinear optical applications since the strength of the nonlinear effect is proportional to the intensity (to some power, depending on the order of the effect). This is a fairly standard term that you will find in any text discussing nonlinear optics. Laser energy density, particularly as you define it, sounds like term that is used in some fairly specialized application. Generally, you should use whatever terms and units are most applicable to the context of your field. If papers in your field generally report laser energy densities rather than intensities, then you should as well.
Energy density accounts for the total energy delivered to the target while power density is related to the rate of the delivering of this energy.
At high power density, non linear effects of laser are important, as stated by Aaron, but, more easily, it should be taken into account the ability of the target in accumulating heat: laser pulses are often used just in order to prevent heat from propagating far from the laser spot
Dear Dr. Francesco Frigerio and Dr. Aaron M. Barlow thank you very much for sharing the valuable knowledge.
ok, Laser power density use in in nonlinear optical applications, and related to the rate of energy.but Laser energy density, is related to delivered total energy to the target.
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