Ktp Crystal, Wide Transmittance, Low Dielectric Constant

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PRODUCTS DETAILS

Basic Info.

Model NO.
FW-CRYSTAL
Specification
costomized
Trademark
FineWin
Origin
Henan China

Product Description

Non-linear Optical Crystals (NLO Crystals) have extended the laser spectrum from deep UV to far IR by various harmonic generations (like SHG, THG, 4HG, 5HG), sum frequency generations, difference frequency generations, optical parametric oscillators, etc.

Product Description:
Potassium Titanium Oxide Phosphate (KTiOPO4 ), or KTP, is an efficient nonlinear optical crystal in the visible to infrared spectral region with relatively low cost. It has large nonlinear coefficient. The effective nonlinear optical coefficient of KTP deff at 1064nm is more than 1.5 times that of BBO. It's damage threshold is near 1 GW/cm2 for 1 Hz 10 ns pulses at 1064nm.

Application:
KTP crystal is a kind of popular nonlinear optical crystal with excellent nonlinear optical properties. As a frequency conversion optical material, KTP crystal had been widely used in scientific research and technique and many other fields, especial best for small and medium-sized power frequency doubling. Frequency doubler and photoparametric amplifier produced by KTP crystal had been had been applied in solid-state tunable laser light source. he properties of KTP make it superior as an electro-optic modulator as well as an optical waveguide device, including phase modulators, amplitude modulators and directional couplers.

Main Specification:
Main Specifications  
Dimension  1x1x0.05 - 30x30x40 mm
Phase matching type Type II, θ=90°; φ=phase-matching angle
Typical Coating a) S1&S2: AR @1064nm R<0.1%; AR @ 532nm, R<0.25%.

b) S1: HR @1064nm, R>99.8%; HT @808nm, T>5%
S2: AR @1064nm, R<0.1%; AR @532nm, R<0.25%

Customized coating available upon customer request.
Angle tolerance 6'
Δθ< ± 0.5°; Δφ< ±0.5°
Dimension tolerance ±0.02 - 0.1 mm
(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) for NKC series
Flatness λ/8 @ 633nm
Scratch/Dig code 10/5 Scratch/dig per MIL-O-13830A
Parallelism <10'
better than 10 arc seconds for NKC series
Perpendicularity 5'
5 arc minutes for NKC series
Wavefront distortion less than λ/8 @ 633nm
Clear aperture  90% central area
Working temperature 25°C - 80°C
Homogeneity dn ~10-6/cm 
Physical and Chemical Properties
Crystal structure Orthorhombic
Point group mm2
Melting point 1172°C incongruent
Lattice parameters a=6.404Å, b=10.615Å, c=12.814Å, Z=8
Temperature of decomposition ~1150°C
Transmition temperature 936°C
Mohs hardness ~5
Density 2.945 g/cm3
Color colorless
Hygroscopic susceptibility no
Specific heat 0.1737 cal/g.°C
Thermal conductivity 0.13 W/cm/°C
Electrical conductivity 3.5x10-8 s/cm (c-axis, 22°C, 1KHz)
Thermal expansion coefficients a1 = 11 x 10-6 °C-1
a2 = 9 x 10-6 °C-1
a= 0.6 x 10-6 °C-1
Thermal conductivity coefficients k1 = 2.0 x 10-2 W/cm °C
k2 = 3.0 x 10-2 W/cm °C
k3 = 3.3 x 10-2 W/cm °C
Dielectric constant eeff = 13
Optical Properties  
Transmitting range 350nm ~ 4500nm
Refractive indices   nx ny nz
1064nm 1.7400 1.7469 1.8304
532nm 1.7787 1.7924 1.8873
Absorption coefficients a < 1%/cm @1064nm and 532nm
Therm-optic coefficients dnx/dT=1.1x10-5/°C
dny/dT=1.3x10-5/°C
dnz/dT=1.6x10-5/°C
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
Sellmeier equations nx2=2.10468 + 0.89342λ2/(λ2-0.04438)-0.01036λ2 
ny2=2.14559 + 0.87629λ2/(λ2-0.0485)-0.01173λ2 
nz2=1.9446 + 1.3617λ2/(λ2-0.047)-0.01491λ2
Nonlinear Properties  
Phase matching range 497nm - 3300 nm
Nonlinear coefficients
 (@ 10-64nm)
d31=2.54pm/V, d31=4.35pm/V, d31=16.9pm/V
d24=3.64pm/V, d15=1.91pm/V at 1.064 mm
Effective nonlinear optical coefficients deff(II)≈ (d24 - d15)sin2qsin2j - (d15sin2j + d24cos2j)sinq
Type II SHG of 1064nm Laser
Phase matching angle q=90°f=23.2°  
Effective nonlinear optical coefficients deff »8.3 x d36(KDP)  
Angular acceptance Dθ= 75 mrad  Dφ= 18 mrad
Temperature acceptance 25°C.cm  
Spectral acceptance 5.6 Åcm
Walk-off angle 1 mrad
Optical damage threshold 1.5-2.0MW/cm2

Advantage:

Efficient frequency conversion(1064nm SHG conversion efficiency is about 80%)
 
Large nonlinear optical coefficients(15 times that of KDP)
 
Wide angular bandwidth and small walk-off angle
 
Broad temperature and spectral bandwidth
 
High thermal conductivity (2 times that of BNN crystal )
 
Moisture free
 
Minimum mismatch gradient
 
Super-polished optical surface
 
No decomposition below 900°C
Mechanically stable 
 
Low cost compare with BBO and LBO

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