Why do UV lasers need a constant temperature

This article will explain why UV lasers need constant temperature. In laser work, temperature is an important parameter, since device performance and output power are strongly dependent on temperature. Especially for ultraviolet lasers, due to its working principle and the characteristics of photoelectric effect, it is more sensitive to temperature changes.

First, understanding how a laser works is important to determine why it is affected by temperature. The working principle of lasers is based on stimulated radiation, that is, atoms or molecules receive energy from an external energy source (such as light), causing them to transfer from a lower energy level to a higher energy level. These activated atoms or molecules then transfer energy to lower energy levels by releasing photons (i.e. laser light). In this process, frequency and wavelength are closely related to output power.

The constant temperature is designed to maintain the ambient temperature of the device at a stable level to maintain the performance and output stability of the device. Due to the special optical properties of ultraviolet lasers, they are more sensitive to temperature changes, so constant temperature is particularly important for them. When the temperature changes, the refractive index of the device's mirrors, optics, and laser medium changes, which causes phase shifts in the beam and disturbances in the mode. This variation is especially detrimental for high-precision and short-wavelength applications.

In order to solve this problem, many laser systems use a constant temperature system to maintain the working performance of the equipment. This constant temperature system can sense temperature changes and adjust the working environment temperature to meet the stability and accuracy requirements of the equipment. For example, the temperature of the laser is adjusted by a liquid cooling system.

In short, ultraviolet lasers are more sensitive to temperature changes due to their working principle and the characteristics of the photoelectric effect. In order to ensure its performance and output stability, a constant temperature system is required to keep the temperature of its working environment stable.