Optical Coatings

optical coatings

Optical Coatings

Our ability to custom coat your optics in-house provides you with an all-inclusive optics manufacturing partner. As a result, we can personally ensure quality throughout and meet quick turnaround times. LaCroix’s engineers can use a stock optical coating or create a custom coating to meet your specifications. From anti-reflective coating and HRs to beamsplitters and cut-off filters, high-performance coatings deliver exceptional value.

In-House Coating Facility

Our in-house coating facility recently expanded to 4,300 sq. ft. (Sep 2017) and houses seven coating chambers. Deposition coating technologies include resistive heat, electron-beam, ion-assisted, and plasma-assisted. Optical coatings can be deposited in a wide working range of 250 to 2500nm.

Coating Design

We have an extensive inventory of over 400 coating designs our engineers can use to provide a stock solution to your requirements. Using stock optical coatings can often reduce your coating cost, as it increases the efficient use of the coating chamber. In the event a custom design is required, our Coating Engineer uses specialized software to design a coating to meet your spectral and environmental performance requirements.


  • Protected Aluminum
  • Enhanced Aluminum
  • Gold
  • Dielectric
    • Long wave pass, Cold Mirror
    • Short wave pass, Hot Mirror
    • Bandpass Filters
    • Notch Filters
    • Dichroic (Color)
    • Beamsplitters, Polarizing and Non-Polarizing
    • Polarizers


  • ‘V’ Coats
  • Broadband
  • Dual Band
  • Multiband
  • Ultra-Broadband
  • Hydrophobic
  • MgF2
Coating Specifications High Reflectors Anti-Reflection
Wavelength Range 250 – 2500 nm 250 – 2500nm
Damage Threshold
Pulsed 20 ns, 20 Hz @ 1064nm 40 J/cm2 40 J/cm2
CW 1 MW/cm2 1 MW/cm2


Available Services

We conduct in-house environmental testing to ISO 9211-3:2008E, MIL-F-48616, MIL-O-13830A, MILC-675C, MIL-C-48497A, and MIL-M-13508C specifications for, but not limited to, adhesion, abrasion, humidity, temperature, and solubility. Laser damage testing is also available upon customer request.

Test Equipment


  • Perkin Elmer Lambda 950
  • Perkin Elmer Lambda 900
  • Perkin Elmer Lambda 35


  • Thermatron Oven
  • Salt Spray Chamber
  • Humidity Chamber

High-performance coatings

From ARs (anti-reflective) to HRs (high reflectors), high-performance coatings deliver exceptional value. Our optical coating technologies include resistive heat deposition, electron-beam deposition, ion-assisted deposition, and plasma-assisted deposition. Our customers can choose from over 400 existing designs or have one custom-designed based on the required performance. The ability to coat on-site as part of the complete production process allows us to meet tighter lead times and ensure quality. Our high-damage threshold coatings have competed and won against some of the best coating departments in the world.


Download MIL-PRF-13830B Specifications