KTP Crystals

Newlight KTP features,

Large nonlinear optical coefficients
Wide angular bandwidth and small walk-off angle
Broad temperature and spectral bandwidth
Nonhydroscopic, chemically and mechanically stable
High thermal conductivity
Flux grown, extremely low cost compared to KTA, BBO and LBO

These favorable features enables KTP to be widely used for frequency doubling (SHG) or sum frequency mixing (SFG) to generate Red/Green/Blue (RGB) outputs, and for optical parameteric oscillator (OPO) or optical parametric amplifier (OPA) to generate visible to mid-infrared tunable wavelengths. KTP is also used in many electro-optic (E-O) devices such as Q-switches and E-O modulators.

Hydrothermally grown gray tracking resistant KTP crystals are available upon request.

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Model	Name	thickness	application	Price	Availability	Action
KTP6030-SHG1064(II)-AR	KTP crystal with size 6x6x3.0mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	3.0 mm	1064nm SHG	USD$239.00
KTP8050-SHG1064(II)-AR	KTP crystal with size 8x8x5.0mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	5.0 mm	1064nm SHG	USD$529.00
KTP3050-SHG1064(II)-AR	KTP crystal with size 3x3x5.0mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	5.0 mm	1064nm SHG	USD$129.00	Out Of Stock
KTP4070-SHG1064(II)-AR	KTP crystal with size 4x4x7.0mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	7.0 mm	1064nm SHG	USD$299.00	Out Of Stock
KTP3080-SHG1064(II)-AR	KTP crystal with size 3x3x8.0mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	8.0 mm	1064nm SHG	Ask	2-3 Days
KTP3100-SHG1064(II)-AR	KTP crystal with size 3x3x10mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	10.0 mm	1064nm SHG	USD$179.00
KTP7100-SHG1064(II)-AR	KTP crystal with size 7x7x10mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	10.0 mm	1064nm SHG	USD$679.00
KTP3150-SHG1064(II)-AR	KTP crystal with size 3x3x15mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	15.0 mm	1064nm SHG	USD$259.00
KTP4150-SHG1064(II)-AR	KTP crystal with size 4x4x15.0mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	15.0 mm	1064nm SHG	Ask
KTP3200-SHG1064(II)-AR	KTP crystal with size 3x3x20mm, theta=90, phi=23.5 for Type II SHG of 1064nm, AR coated @1064/532nm	20.0 mm	1064nm SHG	USD$329.00
KTP3080-SHG1053(II)-AR	KTP crystal with size 3x3x8.0mm, theta=90, phi=33.0 for Type II SHG of 1053nm, AR coated @1053/527nm	8.0 mm	1053nm SHG	Ask
KTP3300-OPO1570(II)-AR	KTP crystal with size 3x3x30mm for Type II NCPM OPO pumped by 1064nm to generate IR @ 1570nm, both faces AR@1064/1570nm	30.0 mm	1064nm OPO	Ask	Out Of Stock
KTP6250-OPO1570(II)-AR	KTP crystal with size 6x6x25mm for Type II NCPM OPO pumped by 1064nm to generate IR @ 1570nm, both faces AR@1064/1570nm	25.0 mm	1064nm OPO	Ask	Out Of Stock
KTP7200-OPO1570(II)-AR	KTP crystal with size 7x7x20mm for Type II NCPM OPO/A pumped by 1064nm to generate IR @ 1570nm, both faces AR@1064/1570nm	20.0 mm	1064nm OPO	Ask	Out Of Stock
KTP3150-OPO1064(II)	KTP crystal with size 3x3x15mm, cut for Type II OPO pumped by 1064nm to generate the signal at 1900nm, both faces uncoated	15.0 mm	1064nm OPO	Ask	Out Of Stock

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KTP is a positive biaxial crystal, with the principal axes X, Y, and Z (n_z>n_y>n_x ) parallel to the crystallographic axes a, b, and c, respectively.

Structural and 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	1172^oC in congruent
Curie Point	936^oC
Mohs Hardness	~ 5
Density	3.01 g/cm³
Color	Colorless
Hygroscopic Susceptibility	No
Specific Heat	0.687 J/g/K
Thermal Conductivity	2 W/m/K
Electrical Conductivity	3.5x10^-8 s/cm (c-axis, @ 22^oC, 1 KHz)

Linear Optical Properties:

Transmitting Range	350 - 3500 nm
Refractive Indices 1064 nm 532 nm	nx ny nz 1.7377 1.7453 1.8297 1.7780 1.7886 1.8887
Sellmeier Equations (λ in µm)	nx²=3.0065+0.03901/(λ²-0.04251)-0.01327λ² ny²=3.0333+0.04154/(λ²-0.04547)-0.01408λ² nz²=3.0065+0.05694/(λ²-0.05658)-0.01682λ²
Thermo-optic Coefficients	dnx/dT=1.1x10^-5 /^oC, dny/dT=1.3x10^-5/^oC dnz/dT=1.6x10^-5 /^oC
Absorption Coefficient	α < 1% cm^-1 @1064 nm and 532 nm

Nonlinear Optical Properties:

Phase-matchable SHG Range	994 - 3600 nm
Nonlinear Optical Coefficients	d31=1.95 pm/v, d32=3.9 pm/v, d33=15.3 pm/v,d24=3.9 pm/v, d15=1.95 pm/v
Effective Nonlinearity Expressions	deff(II)= (d24-d15)sin2φsin2θ-(d15sin²φ+ d24cos²φ)sinθ
For type II SHG of a Nd:YAG Laser at 1064 nm	PM angle: θ=90°, φ=23.5° Effective SHG coefficient: deff=8.3xd36(KDP) Angular acceptance: 20 mrad-cm Temperature acceptance: 25°C-cm Spectral acceptance: 5.6 Å -cm Walk-off angle: 4.5 mrad (0.26°)

Application examples:

SHG of Nd:lasers

KTP is the most commonly used material for frequency doubling of Nd:YAG lasers and other Nd-doped lasers, particularly at the low or medium power density. The following table lists the major NLO properties of KTP for frequency-doubling of a Nd:YAG laser.

PM Angle	θ=90^o, φ=23.5^o
Effective SHG Coefficient	deff = 8.3xd36(KDP)
Angular Acceptance	20 mrad-cm
Temperature Acceptance	25 ^oC-cm
Spectral Acceptance	5.6 Å-cm.
Walk-off angle	4.5 mrad (0.26^o)

Extra- and intra-cavity frequency doubled Nd:lasers using KTP have become a preferred green laser sources for many R&D, medical, industrial, and commercial applications. By using extra-cavity KTP SHG, a conversion efficiency of over 80% and 700 mJ green power were obtained with a 900 mJ injection-seeded Q-switched Nd:YAG laser.

OPG, OPA and OPO

As an efficient OPO crystal pumped by the fundamental and second harmonics of a Nd:YAG or Nd:YLF laser, KTP plays an important role in parametric sources for tunable output from visible (0.6 um) to mid-IR (4.5 um). The non-critical phase-matched (NCPM) OPO/OPA with a X-cut KTP pumped by 1064nm is particularly useful as the signal output @1.57 um is eye safe. NCPM KTP OPO/OPA pumped by the tunable lasers such as Ti:Sapphire, Alexandrite and Cr:LiSrAlF6 have also been reported with a high efficiency of 45%.

Specifications of KTP components:

Wavefront distortion:	< λ/8 @ 633 nm for Aperture =< 5mm, L =< 5mm
Dimension tolerance:	(W +/-0.1 mm) x (H +/-0.1 mm) x (L + 0.2/-0.1 mm) (L+0.5/-0.1 mm) for large crystals.
Clear aperture:	> 90% central area
Flatness:	λ/8 @ 633 nm
Scratch/Dig:	10/5 to MIL-O-13830A
Parallelism:	better than 20 arc seconds
Perpendicularity:	5 arc minutes
Angle tolerance:	Δθ < +/-0.25o, Δφ < +/-0.25o

Coatings:

For SHG of 1064 nm, the standard coating is dual band AR (DBAR) at 1064/532 nm with residual reflectivity < 0.2% @ 1064 nm and < 1.0% @ 532 nm per face. HR @ 1064 nm and HT @ 532 nm is available for compact laser-SHG devices.

Temperature-controlled oven:

KTP may suffer from optical damage known as "gray tracking". Maintaining KTP crystal at an elevated temperature ( e.g., 80oC) can help to reduce the formation of gray tracking. Please refer here for more information on the oven for crystal heating.