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KTP
Product Description
Potassium Titanyl Phosphate (KTiOPO4 or KTP) is an excellent nonlinear optical material suitable for use in many optical systems. It has high nonlinear coefficient and stable physical property. Its most popular application is as a frequency doubler utilizing the 1064nm output of a Nd:YAG laser and to generate 532nm laser. KTP’s properties also make it superior for electro-optic modulation, optical parametric generation.
KTP is a positive biaxial crystal, with the principal axes X, Y, and Z (nz>ny>nx) parallel to the crystallographic axes a, b, and c, respectively.
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 | Around 1172℃ |
Mohs hardness | 5 |
Density | 3.01 g/cm3 |
Color | colorless |
Hygroscopic susceptibility | no |
Thermal conductivity | 0.13 W/(cm*K-1) |
Thermo-optic Coefficient |
dnx/dT=1.1x10-5/°C, dny/dT=1.3x10-5/°C, dnz/dT=1.6x10-5/°C |
Absorption coefficient | <0.1%/cm @ 1064nm, <1%/cm @ 532nm |
Optical Properties:
Transmitting range: | 350 nm - 4500 nm | |
SHG Phase Matchable Range | 497~1800nm (Type II) | |
Refractive indices: 1064nm 532nm |
nx ny nz 1.7377 1.7453 1.8297 1.7780 1.7886 1.8887 |
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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=3.3134+0.05694/(λ2-0.05658)-0.01682λ2 |
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Nonlinear optical coefficients: | d31=6.5pm/v, d32=5pm/v, d33=13.7pm/v, d24=7.6pm/v, d15=6.1pm/v | |
Effective nonlinearity expressions | deff(II)≈(d24 - d15)sin2Φsin2θ - (d15sin2Φ + d24cos2Φ)sinθ | |
For type II SHG of a Nd:YAG Laser at 1064nm: |
Phase matching angle: θ=90°, φ=23.5° Temperature Acceptance: 24°C·cm
Spectral Acceptance: 0.56nm·cm
Angular Acceptance: 14.2mrad·cm (φ);55.3mrad·cm (θ)
Walk-off Angle: 0.55°
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Electro-optic coefficients: | Low frequency (pm/V) High frequency (pm/V) | |
r13 | 9.5 | 8.8 |
r23 | 15.7 | 13.8 |
r33 | 36.3 | 35.0 |
r51 | 7.3 | 6.9 |
r42 | 9.3 | 8.8 |
Dielectric constant: | εeff=13 |
APPLICATION:

Dimension Tolerance | W(+/-0.1)*H(+/-0.1)*L(+0.5/-0.1)mm | ||
Angle Tolerance | +/-0.25° | Perpendicularity | ≤10′ |
Scratch/Dig | 20/10 | Chamfer | ≤0.2mmx45° |
Parallelism | ≤10″ | Chips | ≤0.1mm |
Flatness | λ/10@633nm | Clear Aperture | ≥90% |
Wavefront distortion | λ/8@633nm | ||
Coatings |
C1---AR@1064(R<0.2%)&532(R<0.5%) C2---HR@1064(R>99.8%)&HT@532(T>95%) C3---AR@1064(R<0.2%)&1570(R<0.5%) C4---HR@1570(R>99.8%)&HT@1064(T>99.5%) C5---HR@1064(R>99.8%)&PR@1570(R=50,60,70%+/-2%) |
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Damage Threshold | 500MW/cm² (1064nm, 10ns, 10Hz) |
P/N |
Type |
Size(mm) |
Coating |
KTP.060603.C001 |
SHG |
6x6x3 |
AR1064&532 |
KTP.060605.C001 |
SHG |
6x6x5 |
AR1064&532 |
KTP.070705.C001 |
SHG |
7x7x5 |
AR1064&532 |
KTP.080805.C005 |
SHG |
8x8x5 |
AR1064&532 |
KTP.090905.C001 |
SHG |
9x9x5 |
AR1064&532 |
KTP.151506.C003 |
SHG |
15x15x6 |
AR1064&532 |
KTP.040420.C004 |
OPO |
4x4x20 |
AR1570&1064 |
KTP.060620.C006 |
OPO |
6x6x20 |
AR1570&1064 |
KTP.070720.C004 |
OPO |
7x7x20 |
AR1570&1064 |
KTP.040416.C008 |
OPO |
4x4x16 |
HR1570,HT1064|HR1064,PR1570 |
KTP.050520.C009 |
OPO |
5x5x20 |
HR1570,HT1064|HR1064,PR1570 |
Key words:
ktp
shg
532nm
ktiopo3
potassium titanyl phosphate
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Established in 2001 and located in the city of Qingdao, China. Crystech Inc. is a global supplier of Alexandrite, KTP, RTP and E-O Q-Switch, YAG crystals, Laser Optics and more.
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