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. Finally, we report coefficients from -180 to +30 mrad per 1% energy variation in the 1636-1940 nm range.
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