Potassium Titanyl Phosphate (KTP) Description
Potassium Titanyl Phosphate (KTiOPO4), also known as KTP Crystal, is a nonlinear optical material widely used in various optical devices. It is a transparent and colorless crystal that exhibits excellent properties for optical frequency conversion, electro-optic modulation, and wave mixing. KTP crystal is highly efficient for second harmonic generation (SHG), where it doubles the frequency of an input beam of light.
Potassium Titanyl Phosphate (KTP) Specifications
STANDARD SPECIFICATIONS
| Flatness |
λ/8 @ 633 nm |
| Parallelism |
< 20 arcsec |
| Perpendicularity |
< 5 arcmin |
| Angle tolerance |
< 30 arcmin |
| Aperture tolerance |
± 0.1 mm |
| Surface quality |
10/5 scratch & dig per MIL-O-13830A |
| Clear aperture |
90% of full aperture |
PHYSICAL PROPERTIES
| Crystal structure |
orthorhombic |
| Point group |
mm2 |
| Space group |
Pna21 |
| Lattice constants, Å |
a = 6.404, b = 10.616, c = 12.814, z = 8 |
| Density, g/cm3 |
3.01 |
| Melting point, °C |
1172 |
| Transition temperature, °C |
936 |
| Mohs hardness |
5 |
| Thermal expansion coefficients, °C-1 |
ax = 11×10-6, ay = 9×10-6, az = 0.6×10-6 |
| Thermal conductivity, W/m*K |
13 |
| Not hygroscopic |
|
OPTICAL PROPERTIES
| Transparency |
350–4400 nm |
| Refractive indices |
at 1064 nm |
at 532 nm |
| nx = 1.7404 |
nx = 1.7797 |
| Thermooptic coefficients in 0.4 – 1.0 μm range |
ny = 1.7479 |
ny = 1.7897 |
| nz = 1.8296 |
nz = 1.8877 |
| ∂nx/∂T = 1.1×10-5 (K)-1 |
| ∂ny/∂T = 1.3×10-5 (K)-1 |
| ∂nz/∂T = 1.6×10-5 (K)-1 |
| Wavelength dispersion of refractive indices |
nx2=3.0067+0.0395/(λ2-0.04251)-0.01247*λ2 |
| ny2=3.0319+0.04152/(λ2-0.04586)-0.01337*λ2 |
| nz2 =3.3134+0.05694/(λ2-0.05941)-0.016713*λ2 |
NONLINEAR PROPERTIES
| Phase matching range for: |
|
| Type 2 SHG in x-y plane |
0.99÷1.08 μm |
| Type 2 SHG in x-z plane |
1.1÷3.4 μm |
| Type 2, SHG@1064 nm, cut angle θ=90°, φ=23.5° |
| Walk-off |
4 mrad |
| Angular acceptances |
Δθ = 55 mrad * cm |
| Δφ = 10 mrad * cm |
|
| Thermal acceptance |
ΔT = 22 K * cm |
| Spectral acceptance |
Δν = 0.56 nm * cm |
| Up to 80% extracavity SHG efficiency |
|
| Effective nonlinearity |
| x-y plane |
deoe = doee = d15sin2φ + d24cos2φ |
| x-z plane |
doeo = deoo = d24sinθ |
| |
d31= ± 1.95 pm/V d32=± 3.9 pm/V |
| d33= ± 15.3 pm/V d24= d32 d15= d31 |
| Damage threshold |
>500 MW/cm2 |
| |
for pulses λ=1064 nm, τ=10 ns, 10 Hz, TEM00 |
Notes:
1. To inquire or order a finished crystal, please provide specifications as listed above. For most applications, we only need to know the following:
1) Nd-dopant concentration; 2) Sizes; 3) Surface quality; 4) Coating.
2. For special requests, please provide a detailed specification for evaluation and fabrication.
Potassium Titanyl Phosphate (KTP) Applications
KTP Crystal is ideal for applications like frequency doubling of lasers, producing green light from infrared lasers, and generating ultraviolet light. KTP crystal is also used in optical parametric oscillators and optical switches, as well as in biomedical and telecommunications industries.
Potassium Titanyl Phosphate (KTP) Packing
Potassium Titanyl Phosphate (KTP) are securely packaged in moisture-resistant, anti-static, and shock-absorbing materials. Custom packaging options, such as cleanroom packaging, are also available for sensitive applications.
Potassium Titanyl Phosphate (KTP) FAQs
Q1 What makes KTP ideal for frequency doubling?
KTP is ideal for frequency doubling due to:
- Its high nonlinear optical coefficient, enabling efficient conversion of fundamental wavelengths.
- Broad phase-matching angles, allowing flexibility in laser design.
- High thermal stability, making it suitable for continuous-wave (CW) and high-power pulsed lasers.
Q2 Can KTP be used for other nonlinear optical processes?
Yes, KTP is versatile and can be used for:
- Sum-Frequency Generation (SFG): Combining two wavelengths into a higher frequency.
- Difference-Frequency Generation (DFG): Producing a lower frequency from two higher frequencies.
- Optical Parametric Oscillation (OPO): Generating tunable wavelengths in the mid-infrared range.
Q3 What is the difference between KTP and BBO crystals?
While both KTP and BBO are nonlinear optical crystals, they differ in properties:
- KTP: Higher optical nonlinearity, easier phase matching, and higher damage threshold, ideal for mid-to-high-power applications.
- BBO: Broader transparency range, higher UV transmission, and suitability for ultrafast laser systems.
