High reflective coating

Wavelength shift with changing AOIWith increasing angle of inciden­ce (AOI) the central wavelength of a dielectric coating shifts to shorter wavelengths.The example shows a standard HR 1064 nm /0°. It shifts about 10% when using AOI = 45° but only less than 1% when using AOI < 13°.

CM8M30M12Q is a 8MP USB camera module for the industrial and biomedical microscope high resolution applications. As the full function support, it is a high performance industrial and high resolution digital camera module solution.

Ar coating

Going down from ns-pulses to ps-pulses the damage mechanisms change and the prominent square root rule will not fit anymore.

Optical coating process

HR – polarizationDielectric mirrors have a broa­der reflection band and higher reflection for s-polarized light compared to p-polarized light.The example shows a standard HR 1064 nm / 45° that will achieve:Rs > 99.9%Ru > 99.8%Rp > 99.7%

8M(3264x2448) Image Sensor IMX179Dimensions: Square 38X38mm (Compatible 32X32mm）M12 S-mount Lens Type- Standard: FL3.6mm Fixed Focus- Option: FL 2.1/ 2.8/ 6.0 / 8.0UVC support, Plug & Play for Windows and Linux

LIDT(Laser Induced Damage Threshold)The LIDT of a coating strongly depends on coating materials and production methods.Normally coatings with the highest LIDT will not have the highest reflection.The example shows LIDT (pulsed la­ser) and reflection for different mirror types HR (0°) made with different coating materials (EBE).The peaks in LIDT result from the water band at 940 nm, can be minimized by using IAD or sputtered coatings.

Reflective coating paint

Anti reflection coating

HR – bandwidth Different coating material combinations have different bandwidths. Not every combination is suitable for every wavelength or application.

In LOOP, the LASEROPTIK ONLINE PORTAL, you can search for coated optics available in our stock or configure your own ideas.

HR – PhaseIn the reflected phase a standard mirror has a shift of 180°. By a simple variation of the top layer thickness the phase falls down to zero.The example shows the reflected phase of a mirror HR 1064 nm / 0°a) standard designb) phase optimizedIf necessary every coating can be optimized for its phase specification.

R+T = 1 - lossesPractically the reflection for coa­tings with low losses through absorption and scattering is R = 1-T.For 1064 nm / 0° a standard EBE-coating has absorption < 20 ppm and scattering < 150 ppm. Lower losses (< 10ppm) can be achie­ved with IBS coatings (see Extremely low loss laser optics).For mirrors it is easier to measure the transmission than reflection with standard spectrophotometers. For this reason we normally provide transmission curves for mirrors.

HR – GDD (Group Delay Dispersion)Standard mirrors have already a low GDD but only at the center wavelength as shown here for standard mirror HR 1064 nm / 45°.Especially for fs-laser systems the GDD becomes important. LASEROPTIK can supply GDD optimized optics to your specifications.