Measuring Power with a Saturated Photodiode

TL;DR

This paper introduces a method to measure optical power beyond the saturation point of photodiodes by monitoring dc photocurrent and ac noise, expanding measurement capabilities in high-power applications.

Contribution

It presents a novel approach to extend photodiode power measurement range using saturation monitoring techniques.

Findings

Accurate power measurement beyond saturation point demonstrated.

Monitoring dc photocurrent and ac noise enables high-power measurements.

Method applicable to high-power optical systems.

Abstract

Accurate measurement of optical power is pivotal in many applications and scientific research. However, traditional power meters are unable to measure power levels beyond a certain saturation point, limiting their usefulness in high-power applications. In this technical note, I discuss how optical power can be measured using a saturated photodiode. I demonstrate that by monitoring both the dc photocurrent and ac noise, it is possible to accurately measure power levels beyond its saturation point.