Account

KTA Crystals

KTA Crystals
KTA Crystals KTA Crystals KTA Crystals

KTA crystal features large non-linear optical and electro-optical coefficients in comparison to KTP and has the added benefit of significantly reduced absorption in the 2 to 5 µm region.  It has found wide applications in second harmonic generation (SHG), sum and difference frequency generation (SFG)/(DFG), optical parametric oscillation/ amplification (OPO/OPA), and electro-optical Q-switching involving MIR wavelengths.

Application examples:

55 ps pulse @2.95 μm from a KTA OPA for selective cutting of biological tissues
High average power ns OPO @ 1535 nm with NCPM KTA
Noncollinear OPCPA in KTA produces intense 160 fs pulses @1550 nm
KTA OPA pumped by 120 fs amplified pulses to generate intense 3-5 μm pulses
 

Please use "Add to Cart" to place the interesting products in the shopping cart. Check out with online payment or ask us for the prices/availability via the shopping cart. Filters below or the form at the bottom can be used to assist product search or make further inquiries.
Application:
Thickness:
Part No. Description Application Thickness Price Availability Add to Cart


KTA 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. 
 

Structural and Physical Properties:
 

Crystal Structure  

Orthorhombic, space group Pna21, point group mm2

Cell Parameters  

a=13.125 Å, b=6.5716 Å, c=10.786 Å, Z=8

Melting Point  

1130 oC

Curie Point  

880 oC

Mohs Hardness  

 ~ 5

Density  

3.45 g/cm3

Color  

colorless

Hygroscopic Susceptibility

No

Specific Heat  

0.687 J/g/K

Thermal Conductivity  

1.8 W/m/K

Electrical Conductivity  

0.7-3.4 x10-6 s/cm (c-axis, @22 oC, 1 KHz)



Linear Optical Properties:
 

Transmitting Range     350 - 5000 nm      
Refractive Indices:
               1064 nm
               532 nm
 
    nx             ny            nz
 1.7818      1.7866      1.8680
 1.8264      1.8331      1.9310
Sellmeier Equations
(
λ in μm)  
nx2=1.90713+1.23522λ2 /(λ2-0.19692)-0.01025λ2
ny2=2.15912+1.00099λ2 /(λ2-0.21844)-0.01096λ2
nz2=2.14768+1.29559λ2/(λ2-0.22719)-0.01436λ2
Thermo-optic Coefficients   dnx/dT=1.1x10-5 /oC, dny/dT=1.3x10-5 /oC
dnz/dT=1.6x10
-5 /oC   
Absorption Coefficient    α < 1% cm-1 @1064nm and 532nm   



Nonlinear Optical Properties:
 

Phasematchable SHG Range 542 - 1800 nm  
Nonlinear Optical Coefficients d31=2.8 pm/v, d32=4.2 pm/v,
d
33=16.2 pm/v,d24=3.2 pm/v,
d
15=2.3 pm/v
Effective Nonlinearity Expressions  deff(II)= (d24-d15)sin2φsin2θ-(d15sin2φ+d24cos2φ)sinθ
Electro-optic Coefficients
( Low frequency )
 γ13= 11.5 pm/V, γ23=15.4 pm/V, γ33=37.5 pm/V
 
Dielectric Constant εeff=42  



NCPM Tuning Curve for 1064nm pumped OPO/OPA

With its excellent transmission at the MIR and the possibility to achieve NCPM when pumped with the common Nd lasers at ~ 1 μm, KTA is the crystal of choice for the effective generation of 3-5 μm through OPO/OPA.  The NCPM OPO/A can be temperature tuned by placing an x-cut crystal in an oven. The tuning curve is as follows,
 

 

 


Specifications for finished KTA:
 

Wavefront distortion: less than λ/6 @ 633 nm
Dimension tolerance: (W +/-0.1 mm) x (H +/-0.1 mm) x (L + 0.2/-0.1 mm)
Clear aperture: > 90% central area
Flatness: λ/8 @ 633 nm
Scratch/Dig: 20/10 to MIL-O-13830A
Parallelism: better than 20 arc seconds
Perpendicularity: 5 arc minutes
Angle tolerance:   Δθ < +/-0.25o, Δφ < +/-0.25o

 

 


Coatings:

Standard coatings are dual band anti-reflection (DBAR) coatings at 1064/1535 nm, 1064/3480 nm,  1064/1650 nm, 1064/3000nm, or 1320/660 nm.  Coatings for other specific applications are available upon request.

Mount:

For customer convenience and protection of crystals,  crystals with T≤ 3.0 mm can be
mounted in a 1" anodized aluminum holder.

Thicker crystals are typically supplied unmounted, but water-cooled or uncooled mounts can be offered upon request.

If you do not find the suitable products above, you may let us know your requirements or applications in the form below. Our sales or technical staff will get back to you as soon as possible.

Please provide your contact information for us to get back to you:

Name:
Title:
Organization:
Work Phone:
E-Mail Address:
Enter the code in the box below:
 
 
Newlight Photonics Inc. © 2017