Question

How far can diffuse photons from a laterally focused laser beam penetrate in the axial direction?

Answer 1

The light that does not get reflected gets either absorbed (mostly) or transmitted (usually only for very thin film mirrors). The portion that gets absorbed is transformed into heat, which is transferred into the mirror material.

Therefore, if you shine a short-wavelength, high-power laser beam directly onto a mirror with the intention of damaging the mirror, the power of the laser must be great enough to ensure that the portion of the light that gets absorbed is great enough to heat up the material sufficiently (and fast enough) to melt it. This makes most laser weapons only really effective on

surfaces with low reflectance (plastics, certain composites, human skin, etc.)

thin-walled structures (fuel tanks, etc.)

sensitive electronics (camera's, targeting systems, etc.)

etc.

Answer 2

Explanation:

transmitted (usually only for very thin film mirrors). The portion that gets absorbed is transformed into heat, which is transferred into the mirror material.

Therefore, if you shine a short-wavelength, high-power laser beam directly onto a mirror with the intention of damaging the mirror, the power of the laser must be great enough to ensure that the portion of the light that gets absorbed is great enough to heat up the material sufficiently (and fast enough) to melt it. This makes most laser weapons only really effective on

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