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Potassium Titanyl Phosphate Crystal | KTP Crystal

HM2824

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Potassium Titanyl Phosphate (KTP) Crystal is a high-performance frequency doubling crystal widely used in commercial and scientific applications, including laboratory systems, medical systems, range finders, LIDAR, optical communications, and industrial laser systems. HM is a professional supplier and manufacturer of high-quality KTP Crystal, offering customized solutions and competitive prices.

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Data sheet

Density3.01 g/cm³
MaterialsKTP
Melting Piont1172 ℃
Molecular FormulaKTiOPO4

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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

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 

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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