Potassium Titanyl Phosphate – KTP Crystals

KTP (Potassium titanyl phosphate) is a nonlinear crystal mostly used in extracavity configuration when a single pass through the crystal is required.

 

KTP crystals are optimized for SHG intracavity configuration in low peak power CW lasers. Due to the large number of passes through the crystal, low insertion losses and high homogeneity are essential for conversion efficiency. We select the highest quality material by SHG efficiency mapping of each crystal. Fine surface polishing and dual band AR coatings with very low losses allow EKSMA Optics to produce KTP crystals suitable for intracavity SHG application.

Delivery

Estimated delivery time: from 4 - 5 days

θ
φ
Coating
W, mm
H, mm
L, mm

SHG @ 1064 nm, Type 2 Application

Code θ φ Coating W, mm H, mm L, mm Price Delivery Add to cart
KTP-401 90 23.5 AR/AR@1064+532 nm 3 3 5 88 $ 4 - 5 days To cart
KTP-402 90 23.5 AR/AR@1064+532 nm 3 3 10 125 $ 4 - 5 days To cart
KTP-403 90 23.5 AR/AR@1064+532 nm 4 4 6 136 $ 4 - 5 days To cart
KTP-404 90 23.5 AR/AR@1064+532 nm 7 7 9 608 $ 4 - 5 days To cart

X-cut for eye safe generation by OPO @ 1064 nm -> 1570 nm + 3300 nm

Code θ φ Coating W, mm H, mm L, mm Price Delivery Add to cart
KTP-405 90 0 AR/AR@1064+1570+3300 nm 5 5 20 Request Request To cart

High Gray Track Resistant (HGTR) KTP Crystal

Code θ φ Coating W, mm H, mm L, mm Price Delivery Add to cart
HGTR-0612-05 90 25 AR/AR@1064+532 nm 3.5 3.5 6.7 943 $ Request To cart
Delicious
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
  ny = 1.7479 ny = 1.7897
  nz = 1.8296 nz = 1.8877
Thermooptic coefficients in 0.4 – 1.0 μm range ∂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
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