Potassium Titanyl Phosphate (KTiOPO4 or KTP) is a nonlinear optical crystal, which possesses excellent nonlinear and electro-optic properties. It has large nonlinear optical coefficients and wide angular bandwidth and small walk-off angle, etc. which make it suitable for various nonlinear frequency conversion and wave guide online-ordering.
Due to very high effective nonlinearity (deff ~8.3×d36 (KDP) at 1.06μ m) and excellent optical properties, KTP perfectly suits as lasing material in various online-ordering. The phase matching range of KTP crystal lies in 0.99-3.3 μ m region .This allows us to use KTP as an intracavity and extracavity frequency double for the most commonly used lasers, such as Nd:YAG, Nd:Glass and Nd:YLF.



Potassium Titanyl Phosphate (KTP) has the following exceptional properties that make it a very important nonlinear crystal:

1. Large nonlinear optical coefficient

2. Wide angular bandwidth and small walk-off angle

3.  Broad temperature and spectral bandwidth

4. High electro-optic coefficient and low dielectric constant

5. Large figure of merit

6. Nonhydroscopic, chemically and mechanically stable

7. High thermal conductivity

8. Moisture free

9. Minimum mismatch gradient



KTP is a positive biaxial crystal, with the principal axes X, Y, and Z (nz>ny>nx) parallel to the crystallographic axes a, b, and c, respectively.






1. Frequency doubling (SHG) of Nd-doped lasers for green/red outputs.

2. Frequency mixing (SFM) of Nd laser and diode laser for blue outputs.

3. Parametric sources (OPG, OPA and OPO) for 600nm-4500nm tunable outputs.

4. E-O modulators, optical switches, directional couplers.

5. Optical waveguides for integrated NLO and E-O devices.






Dimension tolerance:             (W ± 0.1 mm) x (H ± 0.1 mm) x (L + 0.2 mm/-0.1mm)

Clear aperture:                      > 90% central area

Flatness:                             1/8 lambda @ 633 nm

Wavefront distortion:             less than 1/8 lambda @ 633 nm

Scratch/Dig code:                10/5 to MIL-O-13830A

Parallelism:                         better than 20 arc seconds

Perpendicularity:                  5 arc minutes

Angle tolerance:                  < ±0.3°

Coating:                              AR coating, HR coating, PR coating



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