Supermirrors

Understanding Supermirrors

Supermirrors are sophisticated optics designed to achieve extremely low scattering and high reflectivity. The specifications for Thorlabs' crystalline supermirrors discussed herein are typical, but may vary as each mirror is custom-made according to specific customer requirements.

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Laser Induced Damage Threshold (LIDT) Overview

The Laser Induced Damage Threshold (LIDT) plays a critical role in determining the suitability of optics for different applications. LIDT is particularly influenced by the type of laser employed. For instance, continuous wave (CW) lasers typically inflict damage through thermal effects, which can occur either through absorption in the coating or substrate. On the other hand, pulsed lasers often strip electrons from the lattice structure, leading to different damage patterns. It is essential to ensure that lenses and mirrors are free from dust and contaminants, as these factors can greatly reduce their damage thresholds. For more information on maintaining clean optics, please refer to our Optics Cleaning tutorial.

Testing LIDT in Supermirrors

Thorlabs conducts LIDT testing following ISO standards. During testing, a low-power laser beam is directed toward the mirror, exposing it to the beam at multiple points for a set duration. Post-exposure, the mirror is examined for any visible damage under a microscope. This process is repeated while incrementally adjusting the power until damage is detected, establishing the threshold for damage tolerance.

The photograph below illustrates a protected aluminum-coated mirror post-LIDT testing, showcasing its ability to withstand 0.43 J/cm² before exhibiting any damage.

Impact of Laser Type on Supermirror Performance

Understanding the differences in how continuous wave (CW) and pulsed lasers affect supermirrors can significantly aid in their application. CW lasers typically lead to damage through thermal means, while pulsed lasers can invoke dielectric breakdown under specific conditions.

For operation with CW lasers, it is crucial to consider the laser's wavelength, beam diameter, and intensity profile to ensure that the optical components meet required specifications. These parameters can all influence LIDT values, creating variability in performance based on the applicational context.

Customization Options for Supermirrors

Supermirrors can be customized to suit a variety of needs and applications. Custom shapes and sizes can ensure that these mirrors integrate seamlessly with existing systems. For further Custom Optical Mirrors options, please contact us for tailored assistance.

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