KTP Crystals

Stock and custom crystals are available
Maximum aperture: 40x40mm
High nonlinear coefficient, high damage threshold
Wide acceptance angle and mild angular walk-off
Applications: SHG@1064nm, OPO, OPA, OPG, and Waveguides
High Gray Track Resistance (HGTR) KTP crystals are also available

Code	Size	θ	φ	Coating	Application	Unit Price	Delivery
20203-020	2x2x5mm	90°	23.5°	AR/AR@1064nm+532nm	SHG of 1064nm	$29	1 Week
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°	0°	S1:HR/HT, S2:HR/PR@1570nm+1064nm	OPO of 1064nm to 1570nm	Inquire	Inquire
20203-015	4x4x20mm	90°	0°	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°	0°	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
20203-021	6x6x5mm	90°	23.5°	AR/AR@1064nm+532nm	SHG of 1064nm	$85	1 Week
20203-017	6x6x20nm	90°	0°	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
20203-018	7x7x20mm	90°	0°	AR/AR@1570nm+1064nm	OPO of 1064nm to 1570nm	Inquire	Inquire
20203-007	7x7x5mm	90°	23.5°	AR/AR@1064nm+532nm	SHG of 1064nm, Type2	$140	4 weeks
20203-008	8x8x5mm	90°	23.5°	AR/AR@1064nm+532nm	SHG of 1064nm, Type2	$185	4 weeks
20203-019	8x8x20mm	90°	0°	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
20203-022	13x13x3mm	90°	23.5°	AR/AR@1064nm+532nm	SHG of 1064nm	$230	1 Week
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, substantial temperature-stable phase-matching characteristics, and non-hygroscopicity. These traits, combined with its excellent transmission in the visible and near-IR wavelength range, have built up their prevalence in the field of Nonlinear Optics (NLOs). KTP crystals could be 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 high conversion efficiency 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, and 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 of 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- Q-switch Nd:YAG lasers using extra-cavity KTP, the resultant output would be a 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

KTP Crystals 6x6x5mm for SHG@1064nm

KTP Crystals 8x8x20mm for OPO@1064nm to 1570nm

KTP Crystals 9x9x5mm for SHG@1064nm