PT Journal AU Lindgren, M Trifonov, V Zorin, M Danerud, M Winkler, D Karasik, BS Gol’tsman, GN Gershenzon, EM TI Transient resistive photoresponse of YBa[sub:2]Cu[sub:3]O[sub:7−δ] films using low power 0.8 and 10.6 μm laser radiation SO Appl. Phys. Lett. JI Appl. Phys. Lett. PY 1994 BP 3036 EP 3038 VL 64 IS 22 DI 10.1063/1.111398 DE YBCO HTS HEB; nonequilibrium AB Thin YBa2Cu3O7−δ laser deposited films were patterned into devices consisting of ten parallel 1 μm wide strips. Nonequilibrium picosecond and bolometric photoresponses were studied by the use of 17 ps full width at half‐maximum laser pulses and amplitude modulated radiation from an AlGaAs laser up to 10 GHz and from a CO2 laser up to 1 GHz. The time and frequency domain measurements were in agreement. The fast response can be explained by electron heating. The use of low optical power and a sensitive measurement system excluded any nonlinear transient processes and kinetic inductance changes in the superconducting state. At 1 GHz modulation frequency, the responsivity was ∼1.2 V/W both for 0.8 and 10.6 μm wavelengths. The sensitivity of a fast and spectrally broadband infrared detector is discussed. ER