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KTP is one of the most commonly used material for frequency doubling diode pumped solid-state lasers such as Nd:YAG and other neodymium-doped lasers. With many advantages such as high optical damage threshold, great optical nonlinearity and excellent theoretical thermal stability, KTP is also frequently used as OPO, EOM, optical wave-guide material, and in directional couplers.
It is well known that most of flux-grown KTP crystals suffer from blackening and efficiency breakdown ("grey-track") when used during SHG process of 1064nm at high average power levels and repetition rates above 1 kHz. Wisoptic’s hydrothermal-grown high gray track resistant KTP (HGTR-KTP) is extremely suitable for laser system applications requiring high power, high efficiency and durability. 

Technical Data [KTP]
Dimension Tolerance ± 0.1 mm
Angle Tolerance < ± 0.2°
Flatness < λ/8 @ 633 nm
Surface Quality < 10/5 [S/D]
Parallelism < 20”
Perpendicularity ≤ 5'
Chamfer ≤ 0.2mm @ 45°
Chip ≤ 0.1mm
Wavefront Distortion < λ/8 @ 633 nm
Clear Aperture > 90% central area
Coating AR coating: R<0.2% @ 1064 nm, R<0.5% @ 532 nm
[or HR coating, PR coating ]
Laser Damage Threshold
500 MW/cm2 for 1064nm, 10ns,10Hz
300 MW/cm2 for 532nm, 10ns,10Hz