Remember you should not be required to add a safety

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requirements; specifying an even higher LIDT will simply add cost. Remember: you should not be required to add a safety factor due to components from your manufacturer not meeting their LIDT specification - experienced laser optics manufacturers should consistently meet their quoted LIDT on all components. LIDT Manufacturers and Costs Manufacturing optics that consistently meet a specific LIDT requires an additional level of attention to design and manufacturing compared to manufacturing optics for imaging or other applications. The first step is to ensure the designs of the coatings and assemblies are optimized for the required laser powers. This requires analyzing electric field distributions in coatings and adjusting coating design where necessary, as well as analyzing potential ghost reflections and adjusting optical designs in optical assemblies. When it comes to actual manufacturing, cleanliness is paramount. From manufacturing environmental concerns to coating materials purity, ensuring cleanliness is essential. Optics and coatings acceptable for low power applications may be unsuitable for use in high power coatings due to contaminations that do not affect performance at low powers. Additionally, certain process parameters that are not as important for low power applications become important, such as the surface roughness of the polished surfaces. Optical manufacturers should be able to produce testing reports from recognized test institutes, according to the ISO 21254 standard, on request. This demonstrates performance verification of the coated optics and ideally multiple test reports demonstrate repeatable, reliable performance. Avoid Scaling LIDT Scaling LIDT is a controversial topic with many different approaches. While certain scaling laws apply to some specific materials and LIDT measurement conditions, there is no generally applicable LIDT scaling formula based on experimental data that can be used to rigorously determine a new LIDT over a broad wavelength, pulse duration, or spot diameter scale without a new LIDT measurement. However, for very small shifts in wavelengths, pulse durations or spot sizes, it is often a reasonable approximation to assume a scaling of the LIDT with the square root of the pulse duration and a linear scaling with the wavelength. If the wavelength and/or pulse duration of your application are not close to the specified LIDT value, do not attempt to scale or convert it. Testing must be performed at the correct pulse duration and wavelength in order to guarantee compatibility with your application.
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  • Fall '19
  • LIDT

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