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Crystals NLO Crystals S-KTP
S KTP Super Potassium Titanyl Phosphate(S-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.
  • Large nonlinear optical coefficient
  • Wide angular bandwidth and small walk-off angle
  • Broad temperature and spectral bandwidth
  • High thermal conductivity
Structural and Physical Properties:
Crystal structure Orthorhombic, space group Pna2 1 ,point group mm2
Cell parameters a=6.404Å, b=10.616Å, c=12.814Å, Z=8
Melting point 1172¡ãC incongruent
Curie point 936°C
Mohs hardness »5
Density 3.01 g/cm 3
Color colorless
Hygroscopic susceptibility no
Specific heat 0.1643 cal/g°C
Thermal conductivity 0.13 W/cm/°K
Electrical conductivity 3.5x10 -8 s/cm (c-axis, 22°C, 1KHz)

 

Linear Optical Properties:

Transmitting range: 350 nm - 4500 nm
Refractive indices: 1064nm 532nm n x n y n z 1.7377 1.7453 1.8297 1.7780 1.7886 1.8887
Sellmeier equations: (l in mm)

n x 2 =3.0065+0.03901/( l 2 -0.04251)-0.01327 l 2
n y 2 =3.0333+0.04154/( l 2 -0.04547)-0.01408 l 2
n z 2 =3.0065+0.05694/( l 2 -0.05658)-0.01682 l 2

Therm-optic coefficients: dn x /dT=1.1x10 -5 /° C,
dn y /dT=1.3x10 -5 /° C,
dn z /dT=1.6x10 -5 /° C
Absorption coefficient: a < 1% cm -1 @1064nm and 532nm

Nonlinear Optical Properties:

Phase matchable SHG range: 497 - 1800nm
Nonlinear optical coefficients: d 31 =6.5pm/v, d 32 =5pm/v, d 33 =13.7pm/v,
d 24 =7.6pm/v, d 15 =6.1pm/v
Effective nonlinearity expressions d eff (II)» (d 24 - d 15 )sin2fsin2q - (d 15 sin 2 f + d 24 cos 2 f)sinq4SPAN lang=EN-US style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt">
For type II SHG of a Nd:YAG: Laser at 1064nm: PM angle: q=90¡ã, f=23.5¡ã Effective SHG coefficient: d eff »8.3xd 36 (KDP) Angular acceptance: 20 mrad-cm Temperature acceptance: 25¡ãC-cm Spectral acceptance: 5.6 Å -cm Walk-off angle: 4.5 mrad (0.26¡ã) Optical damage threshold: > 450MW/cm 2 , (@ 1064nm, 10ns, 10Hz)
Electro-optic coefficients: Low frequency (pm/V) High frequency (pm/V)
r 13 9.5 8.8
r 23 15.7 13.8
r 33 36.3 35.0
r 51 7.3 6.9
r 42 9.3 8.8
Dielectric constant: e eff =13

KTP for 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. KTP for 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 (0.6mm) to mid-IR (4.5mm). NCPM KTP OPO pumped by 1064nm, the signal output is around eye safe wavelength, find applications in eye-safe devices. The NCPM KTP OPO keeps the KTP crystal fixed in X-axis and tunes the pumping wavelength. If 1064nm pumping source, the output will be at 1.57mm (signal) and 3.3 mm (idler).

S-KTP Specifications:

Dimension tolerance ± 0.1 mm
Wavefront distortion: l /8 @ 633 nm
Clear aperture: > 90% central area
Flatness: l /8 @ 633 nm
S/D: 10/5 to MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 12 arc minutes
Angle tolerance: Dq < ±0.2°, Dj < ± 0.2°
AR coating: R< 0.1% at 1064nm and R<0.4% at 532 nm.
Optical damage threshold 500MW/cm 2 , (@ 1.064mm, 10ns, 10Hz)

 

 


 
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