KTP | SIMTRUM Photonics Store

Material

KTP

Dimension Tolerance(mm)

±0.1

Surface Quality

10/5

Flatness

<λ/6@633nm

Wavefront Distortion

λ/8

Parallelism(arcsec)

20

Damage Threshold(pulsed)

1.5-2.0MW/cm2

Mount

Unmounted

Typical Application

SHG @ 1064nm, Type 2

            Fig. 1 represents Type 2 SHG tuning curve of KTP in x-y plane. In x-y 

            plane the slope d(Dk)/dq is small. This corresponds to quasi-angular 

            noncritical  phase mat-ching, which ensures the double advantage of a 

            large acceptance angle and a small walk off.

Fig. 2 represents Type 2 SHG tuning curve of KTP in x-z plane. in x-z 

plane the slope d(Dk)/dq is almost zero for wavelengths in the range 

1.5-2.5 m m and this corresponds to quasi-wavelength noncritical phase 

matching, which ensures a large spectral acceptance. Wavelength noncrit-ical phase matching is highly desir-able for frequency conversion _of short

pulses.

Crystal structure

orthorhombic

Point Group

mm2

Space group

Pna2₁

Lattice constants, Å

a = 6.404, b = 10.616, c = 12.814, z =   8

Density

3.01

Melting point, °C

1172

Transition temperature, °C

936

Mohs hardness

5

Thermal expansion coefficients, °C^-1

a_x=11x10^-6, a_y=9x10^-6, a_z=0.6x10^-6

Thermal conductivity,W/cm°C

13

Not hygroscopic

Optical Properties

Transparency

350–4400 nm

Refractive indices

at 1064 nm

at 532 nm

n_x = 1.7404

 n_x = 1.7797

n_y = 1.7479

 n_y = 1.7897

n_z = 1.8296

 n_z = 1.8877

Thermooptic coefficients in 0.4 – 1.0 µm range

∂nx/∂T = 1.1×10-5 (K)^-1 

∂ny/∂T = 1.3×10-5 (K)^-1 

∂nz/∂T = 1.6×10-5 (K)^-1

Wavelength dispersion of refractive indices

n_x²=3.0067+0.0395/(λ² –0.04251) –0.01247×λ² 

n_y²=3.0319+0.04152/(λ² –0.04586) –0.01337×λ² 

n_z²=3.3134+0.05694/(λ² –0.05941) –0.016713×λ²

Nonlinear Properties

Phase matching range for:

Type 2 SHG in x-y plane

0.99÷1.08 µm

Type 2 SHG in x-z plane

1.1÷3.4 µm

For Type 2, SHG @ 1064 nm, cut angle θ=90°, φ=23.5°

Walk-of

4   mrad

Angular acceptances

∆θ = 55 mrad × cm ∆φ = 10 mrad × cm

Thermal acceptance

∆T = 22 K × cm

Spectral acceptance

∆ν = 0.56 nm × cm

Up to 80% extracavity SHG efficiency

Effective nonlinearity

x-y plane

d_eoe=d_oee=d₁₅sin²φ+d₂₄cos²φ

x-z plane

d_oeo=d_eoo=d₂₄sinθ 

d₃₁= ± 1.95 pm/V           d₃₂=± 3.9 pm/V 

            d₃₃= ± 15.3 pm/V            d₂₄= d₃₂            d₁₅= d₃

Damage threshold

>500 MW/cm² 

for pulses λ=1064 nm, τ=10 ns, 10 Hz, TEM₀₀

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