Abstract
The frequency chirp in the gain spectra for the signal and idler waves in nanosecond optical parametric oscillators (OPOs) due to the nonlinear refractive index of the gain medium at the pump wavelength is discussed. Computed results for a commonly used 355 nm pumped OPO with lithium borate and beta barium borate as a gain medium show that the frequency shift remains small compared with the gain bandwith, even for a narrow-band OPO pumped above threshold.
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