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KTP Crystals

  • Stock and custom crystals available
  • Maximum aperture: 40x40mm
  • High nonlinear coefficient, high damage threshold
  • Wide acceptance angle and mild walk-off angle
  • Applications: SHG@1064nm, OPO, OPA, OPG, and Waveguides
  • High Gray Track Resistance (HGTR) KTP crystals are also available
Inquire for custom product  
Code Size θ φ Coating Application Unit Price Delivery Cart
20203-001 3x3x10mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $70 4 weeks
20203-002 4x4x10mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $115 4 weeks
20203-003 4x4x15mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $140 4 weeks
20203-014 4x4x16mm 90° S1:HR/HT, S2:HR/PR@1570nm+1064nm OPO of 1064nm to 1570nm Inquire Inquire
20203-015 4x4x20mm 90° AR/AR@1570nm+1064nm OPO of 1064nm to 1570nm Inquire Inquire
20203-004 5x5x5mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $75 4 weeks
20203-016 5x5x20mm 90° S1:HR/HT, S2:HR/PR@1570nm+1064nm OPO of 1064nm to 1570nm Inquire Inuiqre
20203-005 6x6x3mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $35 4 weeks
20203-017 6x6x20nm 90° AR/AR@1570nm+1064nm OPO of 1064nm to 1570nm Inquire Inquire
20203-006 6x6x25mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $370 4 weeks
20203-007 7x7x5mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $140 4 weeks
20203-018 7x7x20mm 90° AR/AR@1570nm+1064nm OPO of 1064nm to 1570nm Inquire Inquire
20203-008 8x8x5mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $185 4 weeks
20203-019 8x8x20mm 90° AR/AR@1570nm+1064nm OPO of 1064nm to 1570nm Inquire Inquire
20203-012 9x9x5nm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 Inquire Inquire
20203-009 9x9x6mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $245 4 weeks
20203-010 10x10x3mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $215 4 weeks
20203-011 10x10x5mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 $275 4 weeks
20203-013 15X15X6mm 90° 23.5° AR/AR@1064nm+532nm SHG of 1064nm, Type2 Inquire Inquire

Potassium Titanyl Phosphate (KTiOPO3 or KTP) Crystals are a versatile kind of optical crystals. The advantages of KTP crystals include high non-linear coefficient and damage threshold, wide acceptance angle, substantially temperature-stable phase-matching characteristics, and non-hygroscopicity. These traits, combined with its excellent transmission in the visible and near-IR wavelength range, have bulit up their prevalence in the field of Nonlinear Optics (NLOs).KTP crystals could be extensively utilized in the Second Harmonic Generation (SHG) of Nd:YAG lasers. When Shalom's KTP is applied outside the cavity of a 900mJ injection-seeded Q-switch Nd:YAG laser, the resultant output is a 700mJ green laser, suggesting a highly efficient conversion of over 80%. Other applications include OPO/OPA/OPG to obtain 600nm-4500nm light output and SFM. 

On the other hand, KTP crystals also manifest promising Electro-Optical properties, including great electro-optical coefficients and low dielectric constants, etc. Because KTP crystals virtually produce no parasitic oscillation, the crystals are attractive options for manufacturing EO modulators, Q-switches, EO deflectors, waveguides, etc.

Hangzhou Shalom EO offers off-the-shelf and custom KTP Crystals with various coating options and rigorous QC inspection, and manifold apertures values up to 40x40mm are available. Standard coating options include: AR, HR, HT, PR dual-wavelength coatings for SHG, other custom coatings could also be tailored. For applications with higher power levels, High Gray Track Resistance (HGTR) KTP crystals are also procurable in Shalom EO.

Applications KTP Crystals:

Second Harmonic Generation:
KTP crystals are especially the best media for the SHG of solid-state green lasers, which are currently becoming favored as pumping sources and amplifiers for visible dye lasers and tunable Ti: Sapphire lasers. With a 900mJ injection-seeded Q- switch Nd:YAG lasers using extra-cavity KTP, the resultant output would be 700mJ green laser, indicating a conversion efficiency above 80%. However, due to the susceptibility to gray-tracking of the crystals in high power operation, usually, the crystals are only applied when the power density is low/medium.

OPO, OPG, and OPA:
KTP is also used as a parametric source providing tunable output in the visible (600nm) to MIR (4500nm) wavelength range. One of the most favorable ways to accomplish extremely efficient conversion is to use tunable laser pumped non-critical phase-matched (NCPM) KTP OPO/OPA.  KTP OPO delivers steady continuous femtosecond pulses with a 108Hz repetition rate and milli-watt average power density, in both signal and idler outputs.

EO Modulations:
KTP possesses potential E-O and dielectric properties that are equivalent to LiNbO3, in addition to its distinctive NLO features. KTP's advantageous qualities make it ideal for a variety of E-O devices. 

Optical Waveguides:
Planar low-loss optical waveguides could be developed on the basis of KTP crystals using the technique of ion implantation. In the field of integrated optics, there has rising interest in KTP crystals. According to research, implantation of He+ ion in KTP crystals could obtain a barrier layer of 2um thick, with significant changes in the refractive index, proving the great potential for KTP based waveguides.

Common Specifications:

Internal Quality

No visible scattering paths or centers

under the inspection of a 50mW green laser

Flatness less than λ/10 @ 633nm
Transmitting Wavefront Distortion less than λ/8 @ 633nm Chamfer ≤0.2mm at 45°
Chip ≤0.1mm Surface Quality better than 10/ 5 S/D (MIL-PRF-13830B)
Parallelism better than 20 arc seconds Perpendicularity ≤5 arc minutes
Angle Tolerance Δθ≤0.25°, Δφ≤0.25° Quality Warranty Period one half year under proper use

Basic Properties:

Crystal Structure

Orthorhombic, space group Pna21,

point group mm2

Lattice Parameter a=6.404Å, b=10.616Å, c=12.814Å, Z=8
Melting Point About 1172°C Mohs Hardness 5
Density 3.01 g/cm3 Thermal Conductivity 13W/m/K
Thermal Expansion Coefficient αx=11x10-6/°C, αy=9x10-6/°C, αz=0.6x10-6/°C
KTP Crystals 10x10x5mm for SHG@1064nm

KTP Crystals 10x10x5mm for SHG@1064nm

KTP Crystals 6x6x3mm for SHG@1064nm

KTP Crystals 6x6x3mm for SHG@1064nm

KTP Crystals 4x4x16mm for OPO@1064nm to 1570nm

KTP Crystals 4x4x16mm for OPO@1064nm to 1570nm