Potassium Titanyl Phosphate Crystal

Data sheet

Density	3.01 g/cm³
Materials	KTP
Melting Piont	1172 ℃
Molecular Formula	KTiOPO4

More info

Potassium Titanyl Phosphate (KTP) Crystal is a widely used nonlinear optical material known for its excellent performance in frequency doubling. It is applied in laboratory research, medical systems, range finders, LIDAR, optical communication, and industrial lasers. With its high nonlinear optical coefficient, KTP is ideal for efficient frequency conversion in both scientific and commercial applications. Heeger Materials (HM) provides high-quality KTP crystals for advanced optical and laser systems.

Potassium Titanyl Phosphate Crystal | KTP Crystal

KTP Crystal Specifications

Dimension Tolerance	(W±0.1 mm) × (H±0.1 mm) × (L+0.5/-0.1 mm) (L≥2.5 mm) (W±0.1 mm) × (H±0.1 mm) × (L+0.1/-0.1 mm) (L＜2.5 mm)
Effective Aperture	90% Central Area
Internal Quality	50 mW Green Light Detection with No Visible Scattering Path or Center
Surface Quality	10/5 Refer to MIL-PRF-13830B Standard
Flatness	≦λ/8 @ 633 nm
Transmitted Wavefront Distortion	≦λ/8 @ 633 nm
Parallelism	20″
Perpendicularity	≦15′
Angle Tolerance	≦0.25°
Chamfer	≦0.2 mm×45°
Edge Chipping	≦0.1 mm
Damage Threshold	＞1 GW/cm2 @ 1064 nm, 10 ns, 10 Hz (AR Coating) ＞0.3 GW/cm2 @ 532 nm, 10 ns, 10 Hz (AR Coating)

KTP Crystal Stock Specifications

Dimensions	Lengths	Theta	PHI	Coating	Application
3x3 mm	5 mm, 10 mm	90°	23.5°	AR/Ar@532+1064 nm	SHG@1064NM, Type II
5x5 mm	5 mm, 10 mm	90°	23.5°	AR/Ar@532+1064 nm	SHG@1064NM, Type II
7x7 mm	5 mm, 10 mm	90°	23.5°	AR/Ar@532+1064 nm	SHG@1064NM, Type II

KTP Crystal Chemical and Structural Properties

Crystal Structure	Orthorhombic, space group Pna21, point group mm2
Unit Cell Parameters	a=6.404 Å, b=10.616 Å, c=12.814 Å, Z=8
Melting Point	~1172 °C
Mohs Hardness	5 Mohs
Density	3.01 g/cm³
Thermal Conductivity	13 W/m/K
Thermal Expansion Coefficient	αx=11×10⁻⁶ /°C, αy=9×10⁻⁶ /°C, αz=0.6×10⁻⁶ /°C

KTP Crystal Optical and Nonlinear Optical Properties

Transparency Range		350-4500 nm
SHG Phase Matchable Range		497-1800 nm (Type Ⅱ)
Therm-optic Coefficient ( λ in μm)		dnx/dT = 1.1×10-5 /℃ dny/dT = 1.3×10-5 /℃ dnz/dT = 1.6×10-5 /℃
Absorption Coefficients		<0.1% /cm at 1064 nm, <1% /cm at 532 nm
For Type Ⅱ SHG of a Nd: YAG laser at 1064 nm	Temperature Acceptance	24 ℃·cm
	Spectral Acceptance	0.56 nm·cm
	Angular Acceptance	14.2 mrad·cm (Φ)；55.3mrad·cm (θ)
	Walk-off Angle	0.55 °
NLO Coefficients		deff (Ⅱ) ≈ (d24 - d15) sin2Φ sin2θ - (d15 sin2Φ + d24 cos2Φ) sinθ
Non-vanished NLO Susceptibilities		d31 = 6.5 pm/V d24 = 7.6 pm/V d32 = 5 pm/V d15 = 6.1 pm/V d33 = 13.7 pm/V
Sellmeier Equations (λ in μm)		nx2 = 3.0065 + 0.03901 / (λ2 - 0.04251) - 0.01327 λ2 ny2 = 3.0333 + 0.04154 / (λ2 - 0.04547) - 0.01408 λ2 nz2 = 3.3134 + 0.05694 / (λ2 - 0.05658) - 0.01682 λ2
Electro-optic Coefficients: r13 r23 r33 r51 r42		Low frequency (pm/V) High frequency (pm/V) 9.5 8.8 15.7 13.8 36.3 35.0 7.3 6.9 9.3 8.8
Dielectric Constant		ɛeff = 13

KTP Crystal Key Advantages

Large nonlinear optical coefficient
Wide angular bandwidth and small walk-off angle
Broad temperature and spectral bandwidth
High electro-optic coefficient and low dielectric constant
Large figure of merit
Nonhydroscopic, chemically, and mechanically stable.

KTP Crystal Applications

Applications for SHG and SFG of Nd: Lasers

KTP is the most commonly used material for frequency doubling of Nd: YAG and other Nd-doped lasers, particularly when the power density is at a low or medium level.

Achieved ~80% conversion efficiency and 700 mJ green laser with 900 mJ Q-switch Nd: YAG laser using extra-cavity KTP.
Generated 8 W green laser from 15 W LD pumped Nd: YVO4 with intra-cavity KTP.
KTP used for intracavity mixing of 0.81 µm diode and 1.064 µm Nd:YAG laser to generate blue light, and intracavity SHG of Nd: YAG or Nd: YAP lasers at 1.3 µm to produce red light

SHG and SFG

Type Ⅱ KTP SHG in XY Plane Type Ⅱ SHG in XZ Plane

Applications for OPG, OPA, and OPO

Due to the second harmonic generation (SHG) effect and optical parametric amplification (OPA) performance of KTP crystals, they play a crucial role as core components in tuning the output wavelength of tunable Nd-ion lasers (from 600 nm visible light to 4500 nm mid-infrared). KTP crystals also have a new application in non-critical phase matching KTP OPO/OPA systems.

OPO pumped at 532 in X-Z plane OPO pumped at 532 in X-Y plane Type Ⅱ NCPM OPO

OPO pumped at 532 in the X-Z plane OPO pumped at 532 in the X-Y plane Type Ⅱ NCPM OPO

Applications for E-O Devices

In addition to its nonlinear properties, KTP crystals also possess excellent electro-optic effects and dielectric properties comparable to LiNbO₃ crystals, making them widely used in electro-optic devices. KTP crystals have a high damage threshold, wide optical bandwidth (>15 GHz), stable thermal and mechanical properties, and low loss. Below is a comparison of KTP crystals with other commonly used electro-optic modulation materials:

Materials	ε	N	Phase			Amplitude
Materials	ε	N	R (pm/V)	K (10-6/℃)	N7r2/ε (pm/V)2	r (pm/V)	K (10-6/℃)	n7r2/ε (pm/V)2
KTP	15.42	1.80	35.0	31	6130	27.0	11.7	3650
LiNbO3	27.90	2.20	8.8	82	7410	20.1	42.0	3500
KD*P	48.00	1.47	24.0	9	178	24.0	8.0	178
LiIO3	5.90	1.74	6.4	24	335	1.2	15.0	124

Applications for Optical Waveguides

By performing ion exchange treatment on KTP substrates, low-loss optical waveguide devices can be obtained. Below is a comparison of KTP with other optical waveguide materials：

Materials	r (pm/V)	n	εeff (ε11ε33)1/2	n3r/εeff (pm/V)
KTP	35	1.86	13	17.30
LiNbO3	29	2.20	37	8.30
KNbO3	25	2.17	30	9.20
BNN	56	2.22	86	7.10
BN	56-1340	2.22	119-3400	5.1-0.14
GaAs	1.2	3.60	14	4.00
BaTiO3	28	2.36	373	1.00

KTP Crystal AR-Coating

Dual Band AR-coating (DBAR) of KTP for SHG of 1064 nm; low reflectance (R<0.2% @1064 nm and R<0.5% @532 nm)
High reflectivity coating: HR 1064 nm & HT 532 nm, R˃99.8% @1064nm, T˃90% @532 nm
Broad Band AR-coating (BBAR) of KTP for OPO applications.
High damage threshold (˃300 MW/cm2 at both wavelengths)
Long durability
Other coatings are available upon request.

KTP Crystal Packing And Shipping

Potassium Titanyl Phosphate (KTP) Crystal will be securely packaged in sturdy containers with cushioning materials to prevent movement or damage during shipping. This careful packaging ensures that the product arrives in perfect condition, maintaining its high-quality standards throughout the delivery process.

Potassium Titanyl Phosphate Crystal | KTP Crystal Packing

Where to Buy KTP Crystal in Bulk?

Heeger Materials Inc., a professional supplier and manufacturer of high-quality Nonlinear Crystals products including Potassium Titanyl Phosphate (KTP) Crystal, leverages extensive expertise in supply and export to offer competitive prices. We provide customized solutions to meet specific requirements, ensuring exceptional quality and customer satisfaction.

Heeger Materials Inc. was established in 2016 in Colorado, USA. We specialize in premium-grade metals, alloys, ceramics, powders, and other materials catering to research, development, and large-scale industrial production in scientific and industrial sectors.

Nonlinear Crystal Stock Models

Nonlinear Crystal Type	BBO, ß-BaB₂O₄	KTP, KTiOPO₃	LBO, LiB₃O₅	BIBO, BiB₃O₆	CLBO, CsLiB₆O₁₀
Transmission Range (nm)	190-3500	350-4500	160-2600	286-2500	180-2750
SHG Phase-Matching Range (nm)	409.6-3500 (Type I) 25-3500 (Type II)	994-2000 (Type II)	551-2600 (Type I) 790-2150 (Type II)	574-2480	473-2750 (Type I) 636-2750 (Type II)
Effective Nonlinear Coefficient deff SHG 1064 nm [pm/V]	2.14 (Type I) 1.47 (Type II)	4.03 (Type II)	0.82 (Type I)	3.34	0.9 (Type I, 4HG) 1.19 (Type I, 5HG) 0.95 (Type II)
Absorption Coefficient [%/cm]	<0.1@1064nm <1@532nm	<0.1@1064nm <1@532nm	<0.1@1064nm <0.3@532nm	<0.1@1064nm	<0.03@1064nm <0.1@532nm
Acceptance Angle SHG 1064 nm [mrad/cm]	0.8 (Type I) 1.27 (Type II)	14.2 (φ) 55.3 (θ)	6.54 (Type I) 15.27 (Type II)	1.03 (ee-o)	0.45 (Type I, 4HG) 0.42 (Type I, 5HG) 1.90 (Type II)
Walk-off Angle SHG 1064 nm [mrad]	55.6 (Type I) 69.4 (Type II)	4.87 (Type II)	6.7 (Type I) 6.4 (Type II)	24.5 (Type I)	7.85 (Type I, 4HG) 7.33 (Type I, 5HG) 33.1 (Type II)
Acceptance Temperature SHG 1064 nm [°C/cm]	70	24	6.7 (Type I) 7.5 (Type II)	2.17	8.30 (Type I, 4HG) 4.60 (Type I, 5HG) 43.1 (Type II)
Acceptance Spectrum	1.1	0.56	1.0 (Type I) 1.3 (Type II)	0.96 (ee-o)	0.13 (Type I, 4HG) 0.16 (Type I, 5HG) 5.60 (Type II)

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