This paper systematically reviews the technological development of photonic detectors for laser ranging, with a focus on analyzing the working principles and performance differences of traditional photodiodes [PN (P-N junction photodiode), PIN (P-intrinsic-N. This paper systematically reviews the technological development of photonic detectors for laser ranging, with a focus on analyzing the working principles and performance differences of traditional photodiodes [PN (P-N junction photodiode), PIN (P-intrinsic-N. Modern aerospace and defense systems rely heavily on photonics, which is the science and technology that generates, controls, and detects photons. This plays an important role in keeping armed forces safe and secure. LASER COMPONENTS has manufactured a photonics toolbox of optical components. At the forefront of modern optoelectronic technology, laser photodetectors and laser photodiodes stand out as two core devices, each showcasing their unique charm. However, it is still a challenge to. Optoelectronic devices refer to those electronic devices whose principle of operation is dependent on both light and electrical currents. They come under the category of photonic devices and generally include electrically driven light sources such as laser diodes and light-emitting diodes.