Monitoring Laser Pulse Energy Using a Photodiode-Based Transimpedance Amplifier

This paper presents the design, implementation, and experimental validation of a simplified, non-invasive monitoring circuit for detecting energy drops in pulsed pump lasers. By using a photodiode and a transimpedance amplifier, the circuit converts scattered light into a voltage signal, enabling indirect yet accurate monitoring of the laser pulse energy. Experimental results demonstrate the circuit’s effectiveness in identifying energy levels below a critical threshold, making it suitable for integration into laser safety and diagnostic systems for high power lasers infrastructures.