Review of Scientific Instruments
An interferometric rapid-scanning autocorrelator employing two antiparallel rotating mirrors in a variable arm is optimized for maximum optical path difference as a function of the separation of the two rotating mirrors. A very compact design (mirror separation≈mirror diameter) is possible without a reduction in the maximum pulse width that can be measured.
"A Compact Rotating-Mirror Autocorrelator Design for Femtosecond and Picosecond Laser Pulses," D. M. Riffe and A. J. Sabbah, Rev. Sci. Instrum. 69, 3099 (1998).