Optical systems configured for both changing the length of a laser pulse and operating as an optical isolator are disclosed. In some embodiments, optical isolation is achieve contemporaneously with laser pulse expansion or compression by using a grating based compressor or expander as one of the polarization...http://www.google.com.au/patents/US7436866?utm_source=gb-gplus-sharePatent US7436866 - Combination optical isolator and pulse compressor
