KTP Crystal | Potassium Titanyl Phosphate

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H, mm

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SHG @ 1064 nm, Type 2 Application

Code	W, mm	H, mm	L, mm	θ	φ	Coating	Price	Delivery	Add to cart
KTP-401	3	3	5	90	23.5	AR/AR@1064+532 nm	123 $	4 - 5 days
KTP-402	3	3	10	90	23.5	AR/AR@1064+532 nm	183 $	4 - 5 days
KTP-403	4	4	6	90	23.5	AR/AR@1064+532 nm	187 $	4 - 5 days
KTP-404	7	7	9	90	23.5	AR/AR@1064+532 nm	842 $	Request

Non Standard Crystals - SHG @ 1064 nm, Type 2 Application

Code	W, mm	H, mm	L, mm	θ	φ	Coating	Price	Delivery	Add to cart
KTP-1030-02	4.5	4.5	9	90	23.5	AR/AR@1064+532 nm	590 $	Request

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

Code	W, mm	H, mm	L, mm	θ	φ	Coating	Price	Delivery	Add to cart
KTP-405	5	5	20	90	-	AR/AR@1064+1570+3300 nm	908 $	3 - 5 days

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	a_x = 11×10^-6, a_y = 9×10^-6, a_z = 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
	n_x = 1.7404	n_x = 1.7797
	n_y = 1.7479	n_y = 1.7897
	n_z = 1.8296	n_z = 1.8877
Thermooptic coefficients in 0.4 – 1.0 μm range	∂n_x/∂T = 1.1×10^-5 (K)^-1
	∂n_y/∂T = 1.3×10^-5 (K)^-1
	∂n_z/∂T = 1.6×10^-5 (K)^-1
Wavelength dispersion of refractive indices	n_x²=3.0067+0.0395/(λ²-0.04251)-0.01247*λ²
	n_y²=3.0319+0.04152/(λ²-0.04586)-0.01337*λ²
	n_z² =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	d_eoe = d_oee = d₁₅sin²φ + d₂₄cos²φ
x-z plane	d_oeo = d_eoo = d₂₄sinθ
	d₃₁= ± 1.95 pm/V d₃₂=± 3.9 pm/V
	d₃₃= ± 15.3 pm/V d₂₄= d₃₂d₁₅= d₃₁
Damage threshold	>500 MW/cm² for pulses λ=1064 nm, τ=10 ns, 10 Hz, TEM₀₀

EKSMA Optics KTP Crystals
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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.