CASTECH's KTP is featured by
Large nonlinear optical coefficient
Wide angular bandwidth and small walk-off angle
Broad temperature and spectral bandwidth
High electro-optic coefficient and low dielectric constant
Large figure of merit
Nonhydroscopic, chemically and mechanically stable

CASTECH offers
@ Strict quality control
@ large crystal size up to 20x20x40mm3 and maximum length of 60mm;
@ Quick delivery(2 weeks for polished only, 3 weeks for coated)
@ Unbeatable price and quantity discount
@ Technical support
@ AR-coating, mounting and re-polishing service

AR-coatings
CASTECH provides the following AR-coatings:
@ Dual Band AR-coating (DBAR) of KTP for SHG of 1064nm.
Low reflectance (R<0.2% at 1064nm and R<0.5% at 532nm );
High damage threshold (>300MW/cm2 at both wavelengths);
Long durability.
@ Broad Band AR-coating (BBAR) of KTP for OPO applications.
@ High reflectivity coating: HR1064nm&HT532nm, R>99.8%@1064nm, T>90%@532nm.
@ Other coatings are available upon request.

CASTECH Warranty on KTP Specifications:
@ Dimension tolerance: (W± 0.1mm)x(H± 0.1mm)x(L+0.5/-0.1mm) (L??2.5mm)
(W± 0.1mm)x(H± 0.1mm)x(L+0.1/-0.1mm) (L<2.5mm)
@ Clear aperture: Central 90% of the diameter
@ No visible scattering paths or centers when inspected by a 50mW green laser
@ Flatness: Less than ??/8 @ 633nm
@ Transmitting wavefront distortion: Less than ??/8 @ 633nm
@ Chamfer: ??0.2mm@45°
@ Chip: ??0.1mm
@ Scratch/Dig code: Better than 10/ 5 to MIL-PRF-13830B
@ Parallelism: Better than 20 arc seconds
@ Perpendicularity: ??5 arc minutes
@ Angle tolerance: ?????0.25° , ?????0.25°
@ Damage threshold[GW/cm ]: >0.5 for 1064nm, TEM00, 10ns, 10Hz (AR-coated)>0.3 for 532nm, TEM00, 10ns, 10Hz (AR-coated)
@ Quality Warranty Period: One half year under proper use.