OP-Unite Solutions Ltd - KTP Crystal, Potassium Titanyl Phosphate Crystal

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%> OP-Unite Solutions Ltd - KTP Crystal, Potassium Titanyl Phosphate Crystal

KTP Crystal

KTP Crystal (Potassium Titanyl Phosphate Crystal)is an outstanding crystal for many applications in nonlinear optics and electro-optics, KTP is a colorless orthorhombic biaxial nonlinear crystal, the transparency range is from 0.35mm to 4.5mm.

Its large optical nonlinearity, high optical damage threshold, wide acceptable angle, low insertion loss and thermal stable phase-matching properties make KTP particularly suitable for frequency doubling of infrared lasers operating near 1mm(e.g.Nd:Laser) and for OPOs.

Its large linear electric-optic efficient and low dielectric constants make it attractive for electro-optic applications, such as modulators and Q-switchs.

1. Structural and Physical Properties

Crystal Structure	Orthorhombic, point group mm²
Cell Parameters	a = 6.404Å, b = 10.616Å, c = 12.814Å, Z = 8
Melting Point	1172 °C Incongruent
Curie point	936 °C
Mohs Hardness	≈ 5.0
Density	3.01g/cm³
Linear Absorption Coefficients	α<0.001 cm^-1 @ λ=1064 nm or 532 nm
Hygroscopic Susceptibility	no
Relative Dielectric Constant	ε_eff=13
Specific heat	0.1643 cal/g.°C
Electrical conductivity	3.5x10^-8 s/cm (c-axis, 22°C, 1KHz)
Thermal Conductivity	13W/m/K

2. Linear Optical Properties

Transparency Range: 350 - 4500 nm, See Transparency Curve	KTP Transparency Curve
Refractive Indices: Wavelength n_x n_y n_z 1064 nm 1.7377 1.7453 1.8297 532 nm 1.7780 1.7886 1.8887
Therm-Optic Coefficients: dn_x/dT=1.1x10^-5/°C dn_y/dT=1.3x10^-5/°C dn_z/dT=1.6x10^-5/°C
Sellmeier Equations: n_x²=3.0065+0.03901/(λ²-0.04251)-0.01327λ² n_y²=3.0333+0.04154/(λ²-0.04547)-0.01408λ² n_z²=3.3134+0.05694/(λ²-0.05658)-0.01682λ²

3. NonLinear Optical Properties

Phase-Matchable Output Range:	492- 1700 nm
NLO Coefficients: d₃₁=2.54pm/V, d₃₂=4.35pm/V, d₃₃=16.9pm/V d₂₄=3.64pm/V, d₁₅=1.91pm/V at 1064 nm d_eff(II)≈ (d₂₄ - d₁₅)sin2φsin2θ - (d₁₅sin²φ + d₂₄cos²φ)sinθ
Electro-Optic Coefficients: γ₁₃ γ₂₃ γ₃₃ γ₅₁ γ₄₂	Low Frequency (pm/V) High Frequency(pm/V) 9.5 8.8 15.7 13.8 36.3 35.0 7.3 6.99 9.3 8.8

4. KTP Specifications:

Transmitting Wavefront Distortion:	less than λ/4 @ 633nm
Dimension Tolerance:	(W ± 0.1mm)x(H ± 0.1mm)x(L+0.2/- 0.1mm)
Clear Aperture:	> 90% central area
Flatness:	λ/8 @ 633nm
Surface Quality:	10/5 Scratch/Dig
Parallelism:	better than 20 arc sec.
Perpendicularity:	15 arc min.
Angle Tolerance:	Δθ< 0.5°, Δφ < 0.5°
AR Coating:	dual wave band AR coating at 1064/532 nm for both faces
Residual Reflectivity:	< 0.2% at 1064 nm and < 0.5% at 532 nm per surface

The following parameters are typically required to specify when ordering:

► Sizes: Width x Height x Length (mm)

► Phase matching angle: θ and φ

► Coating on S1&S2: Protective coating or reflectivity @ wavelength

KTP typical orientations:

► θ=90°, φ=23.5°, For SHG@1064nm Type II phase matching.

► θ=90°, φ=74°~0°, For SHG Type II phase matching, fundamental wavelength range: 0.994—1.079mm.

► θ=90°~54°, φ=0°, For SHG type II phase matching, fundamental wavlength range: 1.079—2.0mm

► θ=90°, φ=0°(X-cut), or q=0°, f=0°(Z-cut), for NCPM application.

► θ=0°, φ=0°(Z-cut), gold coated on X-faces, for Q-switch application.

Phase matching angle: θ and φ

θ and φ are depended on different applications of frequency conversion.

The familiar phase matching angles are listed below:

SHG @ 1064nm Type II θ=90°, φ=23.5°

SHG @ 1053nm Type II θ=90°, φ=32.9°

SHG @ 1047nm Type II θ=90°, φ=37.1°

SHG @ 1550nm Type II θ=53.7°, φ=0°

NCPM θ=90°, φ=0°

Type I phase matching processes are prohibited because of its very low conversion efficiency.

If you’re not sure to calculate the phase matching angles, please contact us for assistance.

Phase matching angle: θ and φ

θ and φ are depended on different applications of frequency conversion. The familiar phase matching angles are listed below:

SHG @ 1064nm Type I θ=22.8°, φ=0°

SHG @ 780nm Type I θ=29.9°, φ=0°

SHG @ 532nm Type I θ=47.6°, φ=0°

SHG@410nm Type I θ=86.9°, φ=0°

SFG @ 1064+532nm Type I θ=31.3°, φ=0°

SFG @ 1064+532nm Type II θ=38.5°, φ=30°

OPO 532nm pump Type I θ=21.0°, φ=0°(tunable range 680-2600nm)

OPO 355nm pump Type I θ=30.0°, φ=0°(tunable range 410-2600nm)

OPO 266nm pump Type II θ=39.0°, φ=30°(tunable range 295-2600nm)

If you’re not sure to calculate the phase matching angles, please contact us for assistance.

Note: Other specifications of KTP crystals and coatings are available upon your requestment.