The optical properties of superconducting bolometers have been presented in YBa2Cu3O7minus;xepitaxial films irradiated by a light emission diode with an 0.94 mgr;m wavelength. The better response occurring in the resistive transition region has been shown and studied. A thermal fluctuation on the flux creep behavior can be employed to illustrate the nonlinearity optical currenthyphen;voltage (Ihyphen;V) characteristics in the lowhyphen;resistive region. However, a dissipative mechanism of flux flow should be used in explaining the best response that reveals a linearIhyphen;Vrelation. Measurement of the bridges yielded the bolometric responsivity of approximately 77 V/W, by illuminating a 2 Hz dynamic signal with 0.15 mW. The noise equivalent power has been estimated as 3.2times;10minus;10Wthinsp;Hzminus;0.5.
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