Which factor should lasers be protected from to prevent beam distortion?

Lasers are highly sensitive to environmental factors that can cause distortion in their beam quality. High heat can affect the properties of the laser components, such as optics and the medium in which the laser operates. Excessive heat may lead to thermal distortion of these components, impacting how well the laser can focus or maintain its beam profile.

Steam also poses a risk, as it can scatter the laser beam or create a vapor that interferes with the transmission of the laser light. The presence of steam can change the refractive index of the air, leading to further distortion.

By protecting lasers from both high heat and steam, you help ensure that the laser operates efficiently and maintains a clear and focused beam. Thus, the correct response indicates that both factors should be considered for optimal laser performance.