*Coatings for 1064nm SHG: AR@1064nm/532nm
or HR@1064nm, AR@532nm
Coatings for OPO/OPA: AR@1064nm/1570nm
Specifications for finished KTP
Wavefront
distortion:
less thanλ/8 @ 633nm
Dimension
tolerance:
(W +/-0.1mm) x (H +/-0.1mm) x (L +
0.2mm/-0.1mm)
( L+0.5mm/-0.1mm) for large crystals.
Clear
aperture:
> 90%
central area
Flatness:
λ/8 @ 633nm
Scratch/Dig:
10/5 to
MIL-O-13830A
Parallelism:
better than 20
arc seconds
Perpendicularity:
5 arc minutes
Angle
tolerance:
Δθ <
+/-0.25o,
Δφ< +/-0.25o
Coatings
For SHG of 1064nm, the standard coating is
dual band AR (DBAR) at 1064nm/532nm with residual reflectivity <0.2% @
1064nm and < 1.0% @ 532nm per face. Other coatings are also available upon
request. Mounts can be provided free of charge.
Temperature-controlled
oven
KTP may suffer from optical damage known
as "gray tracking". Increasing
the temperature of KTP crystal can help to reduce the formation of gray
tracking. Therefore,
for high power or high power density SHG of Nd lasers, heating KTP to a certain
temperature (e.g., 80oC) is recommended. Please refer
here
for more information on the oven for heating up crystals.
