Manganite heterojunction photodetectors for femtosecond pulse laser measurements

We report a sensitive photodetector, based on a manganite junction La2/3Ca1/3MnO3/Si, for femtosecond (fs) pulse laser energy per pulse and average power measurements. The La2/3Ca1/3MnO3/Si photodetector exhibits D⁎ (normalized detectivity) greater than 5.229×109 cm Hz1/2 W−1. The open-circuit photovoltage and short-circuit photocurrent responsivities reach ∼268 V/mJ and ∼275 A/mJ for single pulse irradiation, respectively, and the open-circuit photovoltage responsivity reaches ∼1.7 V/W for average power illumination. The experimental results make the manganite junction a promising fs laser measurement detector and reference standard for calibrating fs lasers.

► Manganite junctions can be a reference standard for calibrating fs lasers. ► The photodetector exhibits D⁎ greater than 5.229×109 cm Hz1/2 W−1. ► Responsivities reach 268 V/mJ and 275 A/mJ for single pulse irradiation. ► Photovoltage responsivity reaches 1.7 V/W for average power illumination.