Beam & Optics
Critical Angle (TIR)
Total internal reflection angle for light travelling from a denser to a rarer medium.
θ_c = arcsin(n₂ / n₁)
Fill the inputs from a real part
Every number is read from that part's datasheet entry: peak power and pulse energy as rated, pulse width at the part's rated maximum.
Solve for
Inputs
Result
Live diagram
Drawn from the values above, redrawn as you type - the same physical schematic the mini-program shows.