KTP Crystal
WaveQuanta

KTP (KTiOPO4) Nonlinear Crystal for 1064 nm SHG and E-O Devices, 350–4500 nm

WQ-NLC-KTP
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Potassium titanyl phosphate (KTiOPO4, KTP) is a common choice for frequency doubling of Nd:YAG and other Nd-doped lasers at low to medium power density, in both extra- and intracavity setups. It is non-hygroscopic and transmits from 350 nm to 4500 nm. Its electro-optic and dielectric properties are comparable to those of LiNbO3, so it is also used in modulators, optical switches and waveguide devices.

Key Features

  • Transmission range 350–4500 nm
  • Non-hygroscopic
  • About 80% SHG conversion efficiency reported at 1064 nm
  • Type II 1064 nm SHG at θ = 90°, φ = 23.2° with deff ≈ 8.3 × d36(KDP)
  • Large nonlinear coefficient d33 = 16.9 pm/V
  • Wide angular acceptance and small walk-off (1 mrad) for Type II 1064 nm SHG
  • E-O and dielectric properties comparable to LiNbO3, with bandwidth above 15 GHz
  • Sizes from 1 × 1 × 0.05 mm up to 30 × 30 × 40 mm

Typical Applications

  • Frequency doubling of Nd-doped lasers for green output, and of 1.3 µm Nd:YAG or Nd:YAP lasers for red output
  • Intracavity sum-frequency mixing of 0.81 µm diode and 1.064 µm Nd:YAG lasers for blue output
  • OPG, OPA and OPO sources tunable over 0.6–4.5 µm
  • Frequency-doubled Nd pump sources for dye lasers and Ti:sapphire lasers and amplifiers
  • Electro-optic modulators, optical switches and directional couplers
  • Optical waveguides for integrated nonlinear and E-O devices

Standard Sizes

Size Cut / orientation Surface / coating Mount
5 × 5 × 1 mm θ = 90°, φ = 0° Polished, uncoated Unmounted
6 × 6 × 5 mm θ = 90°, φ = 23.5°, XY-cut AR/AR @ 1064 + 532 nm Unmounted
7 × 7 × 5 mm θ = 90°, φ = 23.5°, XY-cut AR/AR @ 1064 + 532 nm Unmounted
10 × 10 × 6 mm θ = 90°, φ = 23.5°, XY-cut AR/AR @ 1064 + 532 nm Unmounted
1 × 2 × 1 mm X-cut AR/AR @ 775 + 1550 nm (R < 0.5%) Unmounted

Availability of individual sizes changes; custom sizes, cut angles and coatings are available on request.

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Browse all: Visible and NIR Nonlinear Crystals · Nonlinear Crystals

Model: WQ-NLC-KTP · Custom sizes, orientations and coatings on request — contact WaveQuanta for a quote and lead time.

Chemical Formula KTiOPO4
Crystal Structure Orthorhombic
Lattice Parameters a = 6.404 Å, b = 10.615 Å, c = 12.814 Å, Z = 8
Melting Point / Curie Point 1172 °C / 936 °C
Mohs Hardness ≈ 5
Density 2.945 g/cm³
Hygroscopic Susceptibility None
Thermal Conductivity k1 = 2.0 × 10⁻² W/cm·°C; k2 = 3.0 × 10⁻² W/cm·°C; k3 = 3.3 × 10⁻² W/cm·°C
Thermal Expansion Coefficients α1 = 11 × 10⁻⁶ /°C; α2 = 9 × 10⁻⁶ /°C; α3 = 0.6 × 10⁻⁶ /°C
Electrical Conductivity 3.5 × 10⁻⁸ S/cm (c-axis, 22 °C, 1 kHz)
Transmission Range 350–4500 nm
Absorption Coefficient < 1%/cm at 1064 nm and 532 nm
Nonlinear Coefficients (1064 nm) d31 = 2.54 pm/V, d32 = 4.35 pm/V, d33 = 16.9 pm/V, d24 = 3.64 pm/V, d15 = 1.91 pm/V
Phase-Matching Angle (Type II, 1064 nm SHG) θ = 90°, φ = 23.2°
Effective Nonlinear Coefficient (Type II, 1064 nm SHG) deff ≈ 8.3 × d36(KDP)
Angular Acceptance (Type II, 1064 nm SHG) Δθ = 75 mrad, Δφ = 18 mrad
Temperature / Spectral Acceptance (Type II, 1064 nm SHG) 25 °C·cm / 5.6 Å·cm
Walk-off Angle (Type II, 1064 nm SHG) 1 mrad
Available Dimensions 1 × 1 × 0.05 mm to 30 × 30 × 40 mm
Dimension Tolerance ±0.02–0.1 mm; also quoted as (W ± 0.1 mm) × (H ± 0.1 mm) × (L +0.2/−0.1 mm)
Angle Tolerance Δθ < ±0.5°, Δφ < ±0.5°
Flatness / Transmitted Wavefront Distortion < λ/8 @ 633 nm
Scratch/Dig 10/5 per MIL-O-13830A
Parallelism / Perpendicularity Better than 10 arcsec / 5 arcmin
Clear Aperture Central 90%
Optical Homogeneity δn ≈ 10⁻⁶ /cm
Working Temperature 25–80 °C
Typical Coatings a) S1 and S2: AR @ 1064 nm (R < 0.1%) and 532 nm (R < 0.25%); b) S1: HR @ 1064 nm (R > 99.8%) and HT @ 808 nm, S2: AR @ 1064 nm (R < 0.1%) and 532 nm (R < 0.25%); custom coatings on request
Specification Sheet PDF — Download
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Product Family: Visible and NIR Nonlinear Crystals (3 variants)

Product ▴▾ SKU Size ▴▾ Clear Aperture ▴▾ Operating Wavelength ▴▾
KTP (KTiOPO4) Nonlinear Crystal for 1064 nm SHG and E-O Devices, 350–4500 nm Current WQ-NLC-KTP — — —
LBO (LiB3O5) Nonlinear Crystal for High-Power SHG and THG, 160–2600 nm WQ-NLC-LBO — — —Contact
BIBO (BiB3O6) Nonlinear Crystal for Blue and Green SHG, 286–2500 nm WQ-NLC-BIBO — — —Contact