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KTP
basic information
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 electrooptic 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
● ARcoating, repolishing service.
APPLICATION:
Due to the unique combination of its properties – high nonlinear coefficient, high damage threshold, nonhygroscopic, 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)
● ElectroOptical modulations
● Optical waveguide for integrated NLO and EO devices
● ØSHG, SFG of Nd lasers
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 midIR (4.5 um). In NCPM KTP OPO pumped by 1064 nm, the signal output is around eye safe wavelength, finding applications in eyesafe devices. KTP's OPO pumped by a 1064 nm Ndlaser 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 noncritical phasematched (NCPM) Xcut 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.
ØElectroOptical Modulation
KTP also has promising EO and dielectric properties that are comparable to LiNbO3. These properties make KTP extremely useful in various EO 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 electrooptical 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  C1AR@1064(R<0.2%)&532(R<0.5%) C2HR@1064(R>99.8%)&HT@532(T>95%) C3AR@1064(R<0.2%)&1570(R<0.5%) C4HR@1570(R>99.8%)&HT@1064(T>99.5%) C5HR@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)

KTPY225C1/C1

SHG

2x2x5

KTPX3310C4/C5

OPO

3x3x10

KTPY2210C1/C1

SHG

2x2x10

KTPX3320C3/C3

OPO

3x3x20

KTPY335C1/C1

SHG

3x3x5

KTPX3320C4/C3

OPO

3x3x20

KTPY3310C1/C1

SHG

3x3x10

KTPX3320C4/C5

OPO

3x3x20

KTPY445C1/C1

SHG

4x4x5

KTPX4416C3/C3

OPO

4x4x16

KTPY4410C1/C1

SHG

4x4x10

KTPX4416C4/C3

OPO

4x4x16

KTPY555C1/C1

SHG

5x5x5

KTPX4416C4/C5

OPO

4x4x16

KTPY5510C1/C1

SHG

5x5x10

KTPX4420C3/C3

OPO

4x4x20

KTPY663C1/C1

SHG

6x6x3

KTPX4420C4/C3

OPO

4x4x20

KTPY665C1/C1

SHG

6x6x5

KTPX4420C4/C5

OPO

4x4x20

KTPY668C1/C1

SHG

6x6x8

KTPX5520C3/C3

OPO

5x5x20

KTPY775C1/C1

SHG

7x7x5

KTPX5520C4/C3

OPO

5x5x20

KTPY778C1/C1

SHG

7x7x8

KTPX5520C4/C5

OPO

5x5x20

KTPY885C1/C1

SHG

8x8x5

KTPX6620C3/C3

OPO

6x6x20

KTPY888C1/C1

SHG

8x8x8

KTPX6620C4/C3

OPO

6x6x20

KTPY995C1/C1

SHG

9x9x5

KTPX7720C3/C3

OPO

7x7x20

KTPY996C1/C1

SHG

9x9x6

KTPX7720C4/C3

OPO

7x7x20

KTPY10105C1/C1

SHG

10x10x5

KTPX8820C3/C3

OPO

8x8x20

KTPY10106C1/C1

SHG

10x10x6

KTPX8820C4/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*K1) 
Thermooptic Coefficient  dnx/dT=1.1x105/°C, dny/dT=1.3x105/°C, dnz/dT=1.6x105/°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/(λ20.04251)0.01327λ 2 ny2=3.0333+0.04154/(λ 20.04547)0.01408λ2 nz2=3.3134+0.05694/(λ 20.05658)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)sin2sin2  (d15sin2 + d24cos2)sin  
For type II SHG of a Nd:YAG Laser at 1064nm:  PM angle: =90°, =23.5° Effective SHG coefficient: deff8.3d36(KDP) Angular bandwidth: 14.2mradcm (φ); 55.3mradcm (θ) Temperature bandwidth: 25℃cm Spectral bandwidth: 5.6 Å cm Walkoff angle: 0.55°  
Electrooptic 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 
The next article
KTA