KTP

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Potassium Titanyl Phosphate (KTiOPO4 or KTP) is an excellent nonlinear optical material suitable for use in many optical systems. It has high nonlinear coefficient and stable physical property. Its most popular application is as a frequency doubler utilizing the 1064nm output of a Nd:YAG laser and to generate 532nm laser. KTP’s properties also make it superior for electro-optic modulation, optical parametric generation. CRYSTECH has more than 20 years of KTP growth and processing experience. The crystal growth process has been optimized to provide high-quality and efficient crystals, and the coating process is specially designed to provide a relatively higher damage threshold.

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Product Specifications Physical & Optical Properties Product Features & Applications

Processing indicators

Size Tolerance	W±0.1 mm×H±0.1mm×L+0.5/-0.1 mm (L≥2.5 mm)
CA	≥90%
S/D	10/5 according to MIL-PRF-13830B
Flatness	≤λ/10@633nm
WFD	≤λ/8@633nm
Parallelism	10"
Perpendicularity	≤10'
Angle tolerance	≤0.25°
Chamfer	≤0.2mm@45°
Chip	≤0.1mm
LIDT	>1 GW/cm²@1064nm,10ns,10 Hz (AR coating) >0.3 GW/cm²@532nm,10ns,10Hz (AR coating)

Standard Products

Part Number	Size	Application
1.CR.KTP.222207.C004	22X22X7 mm	SHG@1064nm->532nm
1.CR.KTP.141403.C003	14X14X3 mm	SHG@1064nm->532nm
1.CR.KTP.131303.C003	13X13X3 mm	SHG@1064nm->532nm
1.CR.KTP.121205.C003	12X12X5 mm	SHG@1064nm->532nm
1.CR.KTP.121204.C002	12X12X4 mm	SHG@1064nm->532nm
1.CR.KTP.121203.C005	12X12X3 mm	SHG@1064nm->532nm
1.CR.KTP.111105.C002	11X11X5 mm	SHG@1064nm->532nm
1.CR.KTP.101006.C003	10X10X6 mm	SHG@1064nm->532nm
1.CR.KTP.101005.C001	10X10X5 mm	SHG@1064nm->532nm
1.CR.KTP.090906.C010	9X9X6 mm	SHG@1064nm->532nm
1.CR.KTP.090905.C001	9X9X5 mm	SHG@1064nm->532nm
1.CR.KTP.080830.P003	8X8X30 mm	OPO@1064nm->1570nm
1.CR.KTP.080820.P002	8X8X20 mm	OPO@1064nm->1570nm
1.CR.KTP.757530.P005	7.5X7.5X30 mm	OPO@1064nm->1570nm
1.CR.KTP.050520.C025	5X5X20 mm	OPO@1064nm->1570nm

Transmittance curve of KTP

Physical and Optical Properties

Physical Properties:

Crystal structure	Orthorhombic, space group Pna21,point group mm²
Cell parameters	a=6.404Å, b=10.616Å, c=12.814Å, Z=8
Melting point	Around 1172℃
Mohs hardness	5
Density	3.01 g/cm³
Color	colorless
Hygroscopic susceptibility	no
Thermal conductivity	0.13 W/(cm*K^-1)
Thermo-optic Coefficient	dn_x/dT=1.1x10^-5/°C, dn_y/dT=1.3x10^-5/°C, dn_z/dT=1.6x10^-5/°C
Absorption coefficient	<0.1%/cm @ 1064nm, <1%/cm @ 532nm

Optical Properties：

Transmitting range:	350 nm - 4500 nm
SHG Phase Matchable Range	497～1800nm (Type II)
Refractive indices: 1064nm 532nm	n_x n_y n_z 1.7377 1.7453 1.8297 1.7780 1.7886 1.8887
Sellmeier equations: (λ in μm)	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
Nonlinear optical coefficients:	d₃₁=6.5pm/v, d₃₂=5pm/v, d₃₃=13.7pm/v, d₂₄=7.6pm/v, d₁₅=6.1pm/v
Effective nonlinearity expressions	d_eff(II)≈(d₂₄ - d₁₅)sin2Φsin2θ - (d₁₅sin²Φ + d₂₄cos²Φ)sinθ
For type II SHG of a Nd:YAG Laser at 1064nm:	Phase matching angle: θ=90°, φ=23.5° Temperature Acceptance: 24°C·cm Spectral Acceptance: 0.56nm·cm Angular Acceptance: 14.2mrad·cm (φ);55.3mrad·cm (θ) Walk-off Angle: 0.55°
Electro-optic coefficients:	Low frequency (pm/V) High frequency (pm/V)
r13	9.5	8.8
r23	15.7	13.8
r33	36.3	35.0
r51	7.3	6.9
r42	9.3	8.8
Dielectric constant:	ε_eff=13

KTP Crystal (KTiOPO4)

CRYSTECH has more than 20 years of KTP growth and processing experience. The crystal growth process has been optimized to provide high-quality and efficient crystals, and the coating process is specially designed to provide a relatively higher damage threshold.

Applications:

·SHG, SFG of Nd Lasers

·Optical Parametric Generation (OPG, OPA, OPO)

Products Features:

·Large nonlinear coefficient

·Wide angular bandwidth and small walk off angle

·Broad temperature and spectral bandwidth

·Nonhygroscopic, chemically and mechanically stable