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)-0.01327l 2 n y 2 =3.0333+0.04154/(l 2 -0.04547)-0.01408l 2 n z 2 =3.0065+0.05694/(l 2 -0.05658)-0.01682l 2 |
| Therm-optic coefficients: |
dn x /dT=1.1x10 -5 /¡ãC, dn y /dT=1.3x10 -5 /¡ãC, dn z /dT=1.6x10 -5 /¡ãC |
| 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 |
The Sellmeier equations ( l in µm ):
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
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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