Ultraviolet laser-induced voltages in LaSrAlO₄ single crystal

Laser-induced ultrafast photovoltaic effect is observed in LaSrAlO₄ single crystal at ambient temperature without any applied bias. An open-circuit photovoltage is obtained when the wafer is irradiated by a 248-nm-KrF laser pulse of 20 ns duration. The response time and full width at half maximum of the photovoltage pulse are 6 ns and 19 ns, respectively, indicating that LaSrAlO₄ single crystal has potential application in ultraviolet detector.