KTP crystal is a nonlinear optical material commonly used for frequency doubling of laser beams. It is made of potassium titanyl phosphate and is highly efficient for second harmonic generation. KTP crystals are also useful for generating green and blue laser light from an infrared laser source. KTP crystals are widely used in various applications, including laser medical treatment, laser cutting, and laser communication. Their excellent properties make them a preferred choice in the field of optics and photonics.
Main features:
♦ Larger nonlinear optics (NLO) coefficients
♦ Angular bandwidth, small walk-off angle
♦ Wide temperature and spectral bandwidth
♦ High photoelectric coefficient and low dielectric constant
♦ High conversion efficiency
♦ Higher thermal conductivity
♦ Has good chemical, physical and mechanical properties
Typical applications:
♦ Frequency doubling and mixing of neodymium-doped lasers
♦ Optical Waveguide Applications
♦ Electro-optical modulators, optical switches, couplers
♦ Optical Parametric Amplifiers and Optical Parametric Oscillators (OPA & OPO)
Transparency curve of KTP
Technical Parameters
| Argument Name | Value and Range |
Size tolerance | ±0.1 mm |
Surface quality | 10/5 |
Clear aperture | > 90% |
Flatness | < λ/8@633nm |
Wavefront distortion | < λ/4@633nm |
Parallelism | < 20 arc sec |
Perpendicularity | < 5 arc min |
Coating | AR |
Quality warranty period | 1 year (under proper use) |
Crystal Structure and Physical Properties
| Argument Name | Value and Range |
Crystal structure | Orthorhombic, Space group Pna21, Point group mm2 |
Crystal parameters | a=6.404 Å , b=10.616 Å , c=12.814 Å , Z=8 |
Melting point | ~ 1172°C |
Mohs hardness | 5 |
Density | 3.01 g/cm3 |
Thermal conductivity | 13 W/m/K |
Coefficient of thermal expansion | ax=11 x 10-6/℃ , ay=9 × 10-6/℃ , az=0.6 × 10-6/℃ |
Standard Size
| Product No. | Size（mm） | θ（°） | Φ（°） | Coating | Application |
| KTP-301 | 3 × 3 × 5 | 90 | 23.5 | AR/AR@1064+532 nm | SHG@1064 nm, Type 2 |
| KTP-302 | 3 × 3 × 10 | 90 | 23.5 | AR/AR@1064+532 nm | SHG@1064 nm, Type 2 |
| KTP-401 | 4 × 4 × 6 | 90 | 23.5 | AR/AR@1064+532 nm | SHG@1064 nm, Type 2 |
| KTP-701 | 7 × 7 × 9 | 90 | 23.5 | AR/AR@1064+532 nm | SHG@1064 nm, Type 2 |
| Product No. | Size（mm） | θ（°） | Φ（°） | Coating | Application |
KTP-402 | 4.5 × 4.5 × 9 | 90 | 23.5 | AR/AR@1064+532 nm | Non Standard Crystals - SHG @ 1064 nm, Type 2 |
KTP-501 | 5 × 5 × 20 | 90 | - | AR/AR@1064+1570+3300 nm | X-cut for eye safe generation by OPO @ 1064 nm -> 1570 nm + 3300 nm |
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