Ellipsometer for Solids
This is an “home made” ellipsometer by Patrice Ballet at the University Joseph Fourier (Grenoble).
The principle of this rotating quarter wave plate ellipsometer can be found at this address :
The laser diodes 2 & 3 are required to find the number of periods of the signal.
The signal acquisition is done with an A/D conversion card at 100 kHz and with a resolution of 16 bits.
The angle of incidence is set to silicon (75 °) but can be changed between 0 and 90 degrees.