Time-integral type strongly correlated electronic thin-film laser energy meter

Abstract

Strongly correlated electronic (SCE) systems, such as high-temperature superconducting (HTSC) cuprate and colossal magnetoresistance (CMR) manganite thin films, exhibit giant laser-induced thermoelectric voltage (LITV) effect due to anisotropic Seebeck effect and have a great potential for laser detector applications. In this work, we develop a novel time-integral type LaSrMnO thin-film laser energy meter based on anisotropic Seebeck effect. An epitaxial LaSrMnO thin film prepared by means of the pulsed laser deposition method onto a vicinal cut LaAlO3 substrate is irradiated by a 1064-nm Q-switched Nd:YAG laser and its 2nd (532 nm), 3rd (355 nm), and 4th (266 nm) harmonics at room temperature. The time integral of the LITV signal shows a good linear relationship with the laser energy per pulse in the measured wavelength range, which not only confirms the theoretical analysis, but also provides the basis for designing time-integral type laser energy meter. The advantages over other conventional laser detectors, such as fast (nanosecond order) response, spectrally broadband (from infrared to ultraviolet) and flat response, exceptional chemical and thermal stability, real-time measurement, and energy savings, make the device a promising candidate for next-generation laser detectors and laser energy/power meters.