Optical Coatings
Optical Coatings
Optical Coatings
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Ultrafast Coating<br />
Melles Griot has developed a new coating which is designed for<br />
ultrafast laser systems in the near-infrared. The ultrafast coating<br />
(/091, shown in figure 5.50), an all-dielectric coating, centered at<br />
800 nm, minimizes pulse broadening for ultrafast applications. The<br />
coating also offers exceptionally high reflectance for both<br />
s- and p-polarizations in the range from 750 nm to 870 nm.<br />
The ultrafast coating is ideal for high-power Ti:sapphire laser<br />
applications. This coating is superior to protected and enhanced<br />
metallic coatings because of its ability to handle higher powers. For<br />
lower power light sources, the protected silver /038 coating is strongly<br />
recommended for ultrafast applications because of its low pulsebroadening<br />
effect.<br />
Melles Griot offers the /091 coating standard on both a 12.5-mmand<br />
a 25.0-mm-diameter ultraviolet synthetic fused-silica substrate.<br />
PERCENT REFLECTANCE<br />
100<br />
80<br />
60<br />
40<br />
20<br />
Ultrafast Coating (/091)<br />
Wavelength<br />
Range<br />
(nm)<br />
p-plane<br />
s-plane<br />
700 800 900<br />
1000<br />
WAVELENGTH IN NANOMETERS<br />
Figure 5.50 Ultrafast coating /091<br />
Minimum<br />
Reflectance<br />
R p (%)<br />
Angle of<br />
Incidence<br />
(deg)<br />
Pulse<br />
Broadening<br />
(%)<br />
typical reflectance curves<br />
$ R p > 99% from 770 mm to 830 nm, Rs >99% from 750 nm<br />
to 870 nm<br />
$ High laser-damage threshold<br />
$ Low pulse broadening<br />
COATING<br />
SUFFIX<br />
770–830 99.0 45
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