Chapter Questions
Calculate the maximum permissable energy density (a) for looking directly in a laser beam and (b) for looking on a diffuser screen.
Estimate the eye save diameter of the laser beam, incident on a diffuser screen for portrait holography with a laser of (a) $1 \mathrm{~J}$ and (b) $4 \mathrm{~J}$.
Estimate the exposure (energy density) at a distance of $x=1 \mathrm{~m}$ from a diffusing screen, which is irradiated with a laser pulse of $Q=4 \mathrm{~J}$.
The reference beam in portrait holography is extremely dangerous. A laser beam with a radius of $w=15 \mathrm{~cm}(1 / e$-value) is used as a reference beam. What is the critical pulse energy $Q$ for an eye damage?