Supermax Coated Si Mirrors
The Supermax coating is intended for general-purpose use. Supermax is zero-phase type when used at 45°
Typical measured specifications
R(s) = 99.93%, R(p) = 99.81%, Abs% at normal incidence =0.11%
CW LIDT = 500W/mm +/-10%
NB: The LIDT values are the laser power that a new, clean mirror will withstand per mm (1/e2) of
Avialable products, ‘SuperMax’ coated Si mirrors
The ‘SuperMax’ coating is a new development. Utilizing a ThF4 – free coating design, the Supermax coatings
give the highest reflectivity available, and zero phase shift.
Please table 15.01 for standard sizes.
Special Purpose Silicon Mirrors – PMR, DUAL & PFM
Special-purpose Si mirrors are detailed in this section. All-purpose mirrors for 10.6μm with high reflectivity
and near-zero phase shift when used at 45 degrees incidence are described in data section 15.10.
In addition to the special-purpose mirrors described here, Umicore Laser Optics can manufacture Si mirrors
to customer specifications, with coatings for other wavelengths.
Available products, PMR coated Si mirrors
The PMR, pulsed max-R, coating is designed for use on mirrors for pulsed ‘TEA’ CO2 lasers. Only one
size of mirror is standard. Other sizes can be made to order.
Available products, ‘Dual’ coated mirrors
The ‘Dual’ coating is intended for use on Si mirrors where high reflectivity is required for both CO2 and
visible light. Typical values are R (10.6μm) > 99%, R (633nm) >97%.
Applications include use in articulated arms (medical lasers).
Available products, ‘PFM’ polarization-forcing mirrors
The PFM coating is designed to give high in-cavity reflection for S-pol, with low reflectivity for
P-pol., at 45 deg. incidence.
Mirrors of this type force the laser to emit linearly polarized radiation.