% Response.ContentType = "text/html" Response.CharSet = "utf-8" %>
|
Materials>Crystals>>Potassium Titanyl Phosphate | ||||||||||||||
|
Potassium Titanyl Phosphate (KTiOPO4
or KTP) |
Advantages: |
|
Applications: |
|
AZURE Provides: |
|
Basic Properties |
1. Structural and Physical Properties |
Crystal Structure |
Orthorhombic, point group mm2 |
Cell Parameters |
a = 6.404Å, b = 10.616Å, c = 12.814Å Z = 8 |
Melting Point |
1172 oC Incongruent |
Curie point |
936 oC |
Mohs Hardness |
» 5.0 |
Density |
3.01g/cm3 |
Linear Absorption Coefficients |
a <0.001 cm-1 @ l =1064 nm or 532 nm |
Hygroscopic Susceptibility |
no |
Relative Dielectric Constant |
eeff=13 |
Specific heat |
0.1643 cal/g.oC |
Electrical conductivity |
3.5x10-8 s/cm (c-axis, 22oC, 1KHz) |
Thermal Conductivity |
13W/m/K |
2. Linear Optical Properties |
Transparency Range:350-4500 nm,See Transparency Curve | |
Refractive Indices: | KTP Transparency Curve |
Wavelength nx
ny nz 1064 nm 1.7377 1.7453 1.8297 532 nm 1.7780 1.7886 1.8887 |
|
Therm-Optic Coefficients: | |
dnx/dT=1.1x10-5/oC dny/dT=1.3x10-5/oC dnz/dT=1.6x10-5/oC |
|
Sellmeier Equations: | |
n2x=3.0065+0.03901/(l2-0.04251)-0.01327l2 n2y=3.0333+0.04154/(l2-0.04547)-0.01408l2 n2z=3.3134+0.05694/(l2-0.05658)-0.01682l2 |
3. NonLinear Optical Properties |
Phase-Matchable Output Range: |
492- 1700 nm |
|
NLO Coefficients: |
||
Electro-Optic Coefficients: |
Low Frequency (pm/V) |
High Frequency(pm/V) |
g13 |
9.5 |
8.8 |
g23 |
15.7 |
13.8 |
g33 |
36.3 |
35.0 |
g51 |
7.3 |
6.99 |
g42 |
9.3 |
8.8 |
Applications for SHG and 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. The following Table lists the major NLO properties of KTP for frequency-doubling of Nd:YAG laser. |
PM angle |
q=90o, f=23.5o, |
Effective SHG coefficient |
deff » 8.3xd36(KDP) |
Angular acceptance |
20 mrad-cm |
Temperature acceptance |
25oC-cm |
Spectral acceptance |
5.6 Å-cm. |
Walk-off angle |
4.5mrad (0.26o) |
Optical damage threshold |
> 450MW/cm2, (@ 1.06mm, 10ns, 10Hz) |
To date, extra- and intra-cavity frequency doubled Nd:lasers using KTP have become a preferred green laser source for many R&D, medical, industrial and commercial 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:laser, 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. |
Type II SHG in XY Plane Type II SHG in XZ Plane |
|
Applications for OPG, OPA and OPO |
||
|
|
|
KTP's OPO results in stable, continuous outputs of femtosecond pulse of 108 Hz repetition rate and kilowatt average power levels in both signal and idler outputs. KTP's OPO pumped by a 1064nm Nd:laser has generated above 66% conversion efficiency for degenerate conversion from 1064 to 2120 nm. The recently developed new application is the non-critical phase-matched (NCPM) KTP OPO/OPA pumped by the tunable lasers such as Ti:Sapphire, Alexandrite and Cr:LiSrAlF6 (see right figure). The NCPM KTP OPO keeps the KTP crystal fixed in X-axis and tunes the pumping wavelength. If a tunable Ti:Sapphire laser is used as a pumping source (0.7 mm to 1 mm), the output can cover the wavelength range from 1.04mm to 1.45 mm (signal) and from 2.15 mm to 3.2 mm (idler). Due to the favorable NLO properties of NCPM KTP, as high as 45% conversion efficiency was obtained with narrow output bandwidth and good beam quality. |
Quasi-Phase-Matched Waveguide Now, AZURE can provide as large as 30x30x1 mm KTP with -Z or both faces polished for waveguide applications. Other size is also available upon request. Oven for heating KTP crystals: AZURE's warranty on KTP specifications: |
Transmitting wavefront distortion: |
less than l/4 @ 633nm |
Dimension tolerance: |
(W 0.1mm)x(H 0.1mm)x(L+0.2mm/- 0.1) |
Clear aperture: |
> 90% central area |
Flatness: |
l/8 @ 633nm |
Surface quality: |
10/5 Scratch/Dig |
Parallelism: |
better than 20 arc sec. |
Perpendicularity: |
15 arc min. |
Angle tolerance: |
Deltaq < 0.5, Deltaf < 0.5 |
AR coating: |
dual wave band AR coating at 1064/532 nm for both faces |
residual reflectivity: |
< 0.2% at 1064 nm and < 0.5% at 532 nm per surface |
Quality Warranty Period: |
one year under proper use |
Note: |
Copyright © 2000 - 2010. AZURE Photonics U.S.A., Inc All rights reserved. |