KTA Crystal

Potassium Titanyle Arsenate (KTiOAsO4, or KTA) crystal is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) Application. OPO devices based on KTAs are reliable, solid state, tunable laser radiation exhibiting energy conversion efficiencies above 50%. In addition, KTA has a very high damage threshold.
Advantages:
  • Large nonlinear optical and electro-optical coefficients
  • Wide angular bandwidth and small walk-off angle
  • Broad temperature and spectral bandwidth
  • Low dielectric constants, loss tangent and ionic conductivities (much less than that of KTP)
  • High damage threshold
  • Lower absorption in the 3-4 µm spectrum range than KTP
  • Highly resistant to high intensity laser radiation.
wdt_ID Attributes Values
27 Dimension Tolerance W(+/-0.1)*H(+/-0.1)*L(+0.5/-0.1)mm
28 Angle Tolerance ±0.25°
29 Surface quality ＞20/10(MIL-PRF-13830B)
30 Perpendicularity ≤10′
31 Parallelism ≤20″
32 Chamfer ＜0.2mmx45°
33 Flatness λ/10@633nm
34 Wavefront distortion λ/4@633nm
35 Chips ＜0.1mm
36 Coating C1---AR@1064(R＜0.2%)&1533(R＜0.5%)&3475(R＜10%)
37 Damage Threshold 500MW/cm² (1064nm, 10ns, 10Hz)

wdt_ID Attributes Values
63 Crystal Structure Orthorhombic, Point group mm²
64 Lattice Parameters a=13.125Å ,b=6.5716Å, c=10.786Å; Z=8
65 Density 3.454 g/cm³
66 Mohs Hardness ~ 5
67 Melting Point 1130°C
68 Curie Point 880°C
69 Specific Heat 0.687 cal/g°C (25°C)
70 Dielectric Constant e ₑff=42
71 Absorption Coefficient ＜0.05%/cm @1μm and 1.5μm
72 Electrical Conductivity 0.7-3.4 x10⁻⁶s/cm (c-axis, 22℃, 2KHz)
73 Color Colorless
74 Hygroscopic Susceptibility No
75 Transparency Range 0.35μm ~ 5.3μm
76 Nonlinear Coefficients d₃₁=2.8 pm/V
d₃₂=4.2 pm/V
d₃₃=16.2 pm/V
77 (@1.064μm) d₂₄=3.2 pm/V
d₁₅=2.3 pm/V
78 Electro-optical constants(low frequency) r₃₃ 37.5 pm/V
r₂₃ 15.4 pm/V
r₁₃ 11.5 pm/V
79 Sellmeier Equations(λ in μm) nx² = 1.90713+1.23522l2/(λ2-0.19692)-0.01025λ2
ny² = 2.15912+1.00099l2/(λ2-0.21844)-0.01096λ2
nz² = 2.14768+1.29559l2/(λ2-0.22719)-0.01436λ2
80 Refractive Indexes (@1.064μm) nₓ 1.783
nᵧ 1.7893
nz 1.8679
81 SHG PM range 1μm ~ 3μm
82 Cut angle for NCPM OPO θ 90 φ 0
83 Wavelength for NCPM OPO Pump 1064 nm
Signal 1533 nm
Idler 3475 nm