Abstract
Abstract Energy meters have become one of the most important tools to determine the performance of pulsed lasers. In case of low power semiconductor lasers operating in a nanosecond and subnanosecond regime, the pulse energy measurement is difficult due to low sensitivity of the apparatus. Moreover, the energy measurement of pulses generated with high frequencies is still challenging for many commercially available meters. In this paper, an ultra-sensitive, high repetition rate, real-time and low-cost laser energy meter based on a high-speed photodiode is presented. The meter’s performance was optimized by using circuit simulation software to achieve maximum sensitivity and high-speed operation. In the experimental part, the minimum detectable energy and the maximum pulse repetition rate were determined to be 110 fJ and 2.28 MHz, respectively. To the best of author’s knowledge, the developed meter is the most sensitive and the fastest infrared pulse energy meter ever reported, including commercially-available devices.
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