Linearity limits of biased S1337 trap detectors

The upper limit to the power at which trap detectors have a linear response was recently measured. We have complemented these measurements by testing traps with an applied bias voltage at several visible wavelengths. We used Hamamatsu S1337-1010 silicon photodiodes, and also briefly tested the S5227 -1010 photodiode. Application of a bias voltage increases the linearity lim it by a factor of more than 10 for very narrow beams and of more than 30 fo r wide beams. No irreversible changes were detected even for the highest ir radiance measured (33 W/cm(2) at 406 nm). The minimum bias voltages require d for linearities of 99 %, 99.8 % and 99.95 % are presented for several bea m sizes.