What does the term “quantum efficiency” mean in the context of NVGs?

In the context of night vision goggles, "quantum efficiency" specifically refers to the effectiveness of the photocathode in converting incoming photons (light particles) into electrons. The photocathode is a crucial component in NVGs; it absorbs the photons that are present in low light conditions and releases electrons as a result. A higher quantum efficiency indicates that a larger proportion of the incoming photons are successfully converted into electrons, which enhances the overall performance of the night vision device by improving image brightness and sensitivity to low light environments.

This metric is essential because it directly impacts the ability of the night vision goggles to produce usable images in darkness. When the quantum efficiency is optimized, it allows the NVGs to function effectively, giving the user clearer and brighter images in low-light situations. Hence, understanding quantum efficiency is fundamental for evaluating and selecting NVGs based on their performance capabilities.