Energy-phase coupling inside sapphire-based f-2f nonlinear interferometers from 800 to 1940 nm.

Energy-phase coupling inside f-2f nonlinear interferometers poses stringent limits on the tolerable pulse-to-pulse energy fluctuations of phase stable laser systems. Here we report a coupling coefficient of -220±20  mrad per 1% energy increase at 800 nm. We also report coefficients from +320 to +820  mrad per 1% energy increase in the 1140-1550 nm (signal) range.