KTP crystal (potassium titanyl phosphate) is a cost effective nonlinear crystal for the second harmonic generation of neudymium based lasers like Nd:YAG, Nd:YVO4. KTP crystal has a high effective nonlinearity (deff) what allows to use relatively short crystals and gain high conversion efficiency in extracavity configuration when only single pass in nonlinear crystal is required.
Crystals available from stock
Description
Potassium titanyl phosphate (KTP) nonlinear crystal is a cost effective crystal for the second harmonic generation of neudymium based lasers like Nd:YAG, Nd:YVO4. KTP crystal has a high effective nonlinearity (deff) what allows to use relatively short crystals and gain high conversion efficiency in extracavity configuration when only single pass in nonlinear crystal is required. Because of wide transparency range KTP crystals could also be used in optical parametric oscillators (OPO) to generate up to 4 µm emission wavelength. KTP crystals grown by flux method due to photochromic effect (grey-tracking) are mostly used for low and medium power applications, when higher power and stability is needed hydrothermaly grown (HGTR) crystal should be the choice. At Photonic Solutions we offer KTP crystals grown by both of the methods.
Specifications
Physical and Optical Properties
| Chemical formula | KTiOPO4 (potassium titanyl phosphate) |
| Optical symmetry | positive biaxial |
| Crystal structure | orthorhombic |
| Lattice constants | a = 12.81 Å, b = 6.4 Å, c = 10.62 Å |
| Density | 2.95 g/cm3 |
| Mohs hardness | 5 |
| Melting point | 1148 °C |
| Refractive index (at 1064 nm) | nx = 1.7381, ny = 1.7458, nz = 1.8302 (flux -grown) |
| Thermal conductivity coefficient | K//x = 2 Wm-1K-1, K//y = 3 Wm-1K-1, K//z = 3.3 Wm-1K-1 |
| Specific heat (298 K) | C = 0.688 Jg-1K-1 |
| Termal expansion coefficient (373 K) | α//x = 8.7 x 10-6 °C-1, α//y = 10.5 x 10-6 °C-1, α//z = -0.2 x 10-6 °C-1 |
| Thermo-optic coefficient (288-313 K) | dnx/dT = 6.1 × 10-6 °C-1 dny/dT = 8.3 × 10-6 °C-1 dnz/dT = 14.5 × 10-6 °C-1 (flux -grown) |
| Direct band-gap energy (293 K) | Eg = 3.54 eV |
| Transparency range | 350 – 4500 nm |
Standard manufacturing specifications
| Cut orientation error: | +/- 30 arcmin |
| Dimensions tolerance: | +/- 0.1 mm |
| Clear aperture: | > 85% of aperture dimensions |
| Surface quality: | 10-5 S-D |
| Surface flatness: | λ/10 @ 633 nm |
| Parallelism error: | < 20 arcsec |
| Perpendicularity error: | +/- 5 arcmin |
Nonlinear Applications
SHG @ 1064 nm, Type 2
| Type 2 | 1064(e) + 1064(o) → 532(e) |
| Phase matching angle (300 K) | Theta (θ) = 90° , Phi (φ) = 23.5° (XY principal plane) |
| Effective nonlinearity | deff = 3.58 pm/V |
| Walkoff angle | 3.16 mrad (1064(e)), 4.13 mrad (532(e)) |
| Angular acceptance | 11.5 mrad x cm |
| Thermal acceptance | 25.42 K x cm |
Products
Product | Dimensions | Length | Theta | Phi | Coatings | Price | Delivery | Quantity | |
|---|---|---|---|---|---|---|---|---|---|
| KTP-SHG-1064-3×2.8×4-HR-HT | 3 x 2.8 mm | 4 mm | 90° | 23.5° | HR1064HT532+808 nm/uncoated | 62.00€ | from stock | | |
| KTP-SHG-1064-3x3x10 | 3 x 3 mm | 10 mm | 90° | 23.5° | AR/AR 1064+532 nm | 135.00€ | request | | |
| KTP-SHG-1064-3x3x3.5 | 3 x 3 mm | 3.5 mm | 90° | 25° | AR/AR 1064+532 nm | 95.00€ | from stock | | |
| KTP-SHG-1064-3x3x5 | 3 x 3 mm | 5 mm | 90° | 23.5° | AR/AR 1064+532 nm | 105.00€ | from stock | | |
