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KTP

Potassium Titanyl Phosphate (KTiOPO3 or KTP) is an excellent nonlinear optical material suitable for use in many optical systems. It has high nonlinear coefficient and stable physical property.
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Product description
Potassium Titanyl Phosphate (KTiOPO3 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.
After years of development, CRYSTECH has become the largest KTP manufacturer in the world.
CRYSTECH offers
Strict quality control
large crystal size up to 20x20x40mm3 and maximum length of 60mm
Quick delivery(3 weeks for polished only, 4 weeks for coated)
reasonable price and quantity discount
Technical support
AR-coating, re-polishing service.
APPLICATION:
Due to the unique combination of its properties – high nonlinear coefficient, high damage threshold, non-hygroscopic, KTP can be used in both commercial and military lasers including medical and laboratory systems, range finders, designators and systems for use in semiconductor industry.
Its application includes:
SHG, SFG of Nd Lasers
Optical Parametric Generation (OPG, OPA, OPO)
Electro-Optical modulations
Optical waveguide for integrated NLO and E-O devices
ØSHG, SFG 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. Extra- and intra-cavity frequency doubled Nd-lasers using KTP have become a preferred green laser source for many R&D, medical, industrial, commercial and military applications. By using extra cavity KTP SHG, over 80% conversion efficiency and 700mJ green laser were obtained with a 900 mJ injection-seeded Q-switched Nd:YAG laser.
Applied to diode-pumped Nd-lasers, KTP is a basic NLO crystal for the construction of compact visible solid state laser systems. Recent advances in intracavity-doubled Nd:YVO4 and Nd:YAG lasers have increased the demand for compact green lasers used in display, construction, optical disk and laser printer. Over 200 mw TEM00 green outputs are available from LD pumped Nd:YVO4 and Nd:YAG lasers and 3 W TEM00, mode-locked green laser was generated by intracavity SHG in a 5.3 W mode-locked diode-laser pumped Nd:YAG laser. Moreover, 2.5mW green light was obtained from 50mW LD pumped and intracavity doubled Nd:YVO4 mini-lasers with a 9mm long cavity.
KTP is also a powerful crystal for SHG and SFG of lasers with wavelength from about 1um to 3.4 um. The SHG phase-matching angle and effective SHG coefficients (deff) of KTP in XY plane (0.9 mm to 1.08 mm) and XZ plane (1.1 um to 3.3 um) are showed in the following figures. Although KTP cut in YZ plane can be phase-matched for SHG of 1 mm to 3.45 um, it is seldom used in practices because of the low deff.
ØOptical Parametric Generation (OPG, OPA, 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). In NCPM KTP OPO pumped by 1064 nm, the signal output is around eye safe wavelength, finding applications in eye-safe devices. KTP's OPO pumped by a 1064 nm Nd-laser has generated above 66% conversion efficiency for conversion from 1064 to 2120 nm. The OPO/OPA in XY and YZ is seldom employed because of their low effective nonlinear coefficients and other limitation.
Below figure shows the non-critical phase-matched (NCPM) X-cut KTP OPO/OPA. For pumping wavelength range from 0.7μm to 1 μm, the output can cover from 1.04μm to 1.45μm(signal) and from 2.15μm to 3.2μm(idler). More than 45% conversion efficiency was obtained with narrow output bandwidth and good beam quality.
 
ØElectro-Optical Modulation
KTP also has promising E-O and dielectric properties that are comparable to LiNbO3. These properties make KTP extremely useful in various E-O devices.
Oven for Heating KTP crystals
Increasing the temperature of KTP crystal can enhance the damage threshold of KTP crystal. Therefore, for high power or high power density SHG of Nd lasers, heating KTP to a certain temperature (e.g., 80——100deg) is recommended. CRYSTECH provides precision oven with temperature controller for heating KTP. A full assembly including KTP crystal, oven and temperature controller is also available.
ADVANTAGE:
Large nonlinear coefficient
Wide angular bandwidth and small walk off angle
Broad temperature and spectral bandwidth
Large electro-optical coefficient
High damage threshold
Nonhygroscopic, chemically and mechanically stable
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%)
Damage Threshold 500MW/cm² (1064nm, 10ns, 10Hz)
   
P/N
Type
Size(mm)
P/N
Type
Size(mm)
KTP-Y-225-C1/C1
SHG
2x2x5
KTP-X-3310-C4/C5
OPO
3x3x10
KTP-Y-2210-C1/C1
SHG
2x2x10
KTP-X-3320-C3/C3
OPO
3x3x20
KTP-Y-335-C1/C1
SHG
3x3x5
KTP-X-3320-C4/C3
OPO
3x3x20
KTP-Y-3310-C1/C1
SHG
3x3x10
KTP-X-3320-C4/C5
OPO
3x3x20
KTP-Y-445-C1/C1
SHG
4x4x5
KTP-X-4416-C3/C3
OPO
4x4x16
KTP-Y-4410-C1/C1
SHG
4x4x10
KTP-X-4416-C4/C3
OPO
4x4x16
KTP-Y-555-C1/C1
SHG
5x5x5
KTP-X-4416-C4/C5
OPO
4x4x16
KTP-Y-5510-C1/C1
SHG
5x5x10
KTP-X-4420-C3/C3
OPO
4x4x20
KTP-Y-663-C1/C1
SHG
6x6x3
KTP-X-4420-C4/C3
OPO
4x4x20
KTP-Y-665-C1/C1
SHG
6x6x5
KTP-X-4420-C4/C5
OPO
4x4x20
KTP-Y-668-C1/C1
SHG
6x6x8
KTP-X-5520-C3/C3
OPO
5x5x20
KTP-Y-775-C1/C1
SHG
7x7x5
KTP-X-5520-C4/C3
OPO
5x5x20
KTP-Y-778-C1/C1
SHG
7x7x8
KTP-X-5520-C4/C5
OPO
5x5x20
KTP-Y-885-C1/C1
SHG
8x8x5
KTP-X-6620-C3/C3
OPO
6x6x20
KTP-Y-888-C1/C1
SHG
8x8x8
KTP-X-6620-C4/C3
OPO
6x6x20
KTP-Y-995-C1/C1
SHG
9x9x5
KTP-X-7720-C3/C3
OPO
7x7x20
KTP-Y-996-C1/C1
SHG
9x9x6
KTP-X-7720-C4/C3
OPO
7x7x20
KTP-Y-10105-C1/C1
SHG
10x10x5
KTP-X-8820-C3/C3
OPO
8x8x20
KTP-Y-10106-C1/C1
SHG
10x10x6
KTP-X-8820-C4/C3
OPO
8x8x20

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
Sellmeier equations: (λ in μm) nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ 2
ny2=3.0333+0.04154/(λ 2-0.04547)-0.01408λ2
nz2=3.3134+0.05694/(λ 2-0.05658)-0.01682λ2
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)sin2sin2 - (d15sin2 + d24cos2)sin
For type II SHG of a Nd:YAG Laser at 1064nm: PM angle:  =90°,  =23.5° Effective SHG coefficient:  deff8.3d36(KDP) Angular bandwidth: 14.2mrad-cm (φ); 55.3mrad-cm (θ) Temperature bandwidth: 25℃-cm Spectral bandwidth: 5.6 Å -cm Walk-off angle: 0.55°
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: eff=13

 

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