Laser induced thermoelectric voltage (LITV) signals from thin films of La1-xSrxMnO3 (LSMO), La1-xPbxMnO3 (LPMO) and La1-xSrxCoO3 (LSCO) were measured at different wavelengths. The three thin films grown on vicinal cut LaAlO3 single crystal substrate were prepared by pulsed laser deposition (PLD). Computer controlled system with lock-in amplifier was used to measured LITV signal. It was found that sensitivity and time response were different at different wavelengths. At wavelengths of 532 nm and 632.8 nm, the sensitivity of LSMO was the largest and that of LSCO was the smallest, but the time response of LSMO and LSCO was opposite. However, the LPMO has the largest sensitivity at wavelength of 808 nm.