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KTP Crystal

KTP Crystal Laser Crylink
KTP Crystal

KTP Electro-optical Q-switch Crystal—a crystal having a high electrooptic coefficient, a low dielectric constant, and capable of operating at high frequencies

The dielectric constant ε22 of KTP varies little with frequency and is not affected by the electric coupling effect under pressure. ε33 varies greatly with frequency and is not affected by the electrical coupling effect under pressure. Especially at high frequencies, ε22 and ε33 do not vary with frequency.Outside the 500kHz-10MHz region, electro-optic devices made with KTP crystals do not produce parasitic oscillations due to piezoelectric coupling, which are severe in other electro-optic crystals. The thermal hysteresis effect of KTP is much smaller and has high temperature stability.

Parameter

Transparency range350-4500 nm
Crystal structureOrthorhombic
Density3.01 g/cm3
Mohs hardness5
Absorption Coeffienta < 1%/cm @1064 nm and 532 nm
Refractive indicesnx=1.7377, ny=1.7453, nz=1.8297 @ 1064 nm
nx=1.7780, ny=1.7886, nz=1.8887  @ 532 nm
Sellmeier equations (λ, μm)nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2
ny2=3.0333+0.04154/(λ2-0.04547)-0.01408λ2
nz2=3.3134+0.05694/(λ2-0.05658)-0.01682λ2
Thermal conductivity13 W/m/K
Therm-optic Coefficients (/℃)dnx/dT=1.1*10-5
dny/dT=1.3*10-5
dnz/dT=1.6*10-5
Electro-optic coefficientsLow Frequency (pm/V)High Frequency (pm/V)
r139.58.8
r2315.713.8
r3336.335
r517.36.9
r429.38.8
Phase Matching Range980-3400 nm
FlatnessLess than λ/8 @ 633 nm
Wave front distortionLess than λ/8 @ 633 nm
Transmission surface parallelismLess than 20″
Electrical conductivity3.5*10-8 s/cm (c-axis,22℃,1KHz)
Dielectric constantεeff=13
Cell Parametersa=6.404 Å, b=10.616 Å, c=12.814 Å, z=8.00 Å
Melting Point1172 ℃
Curie Point936 ℃
Specific Heat0.1643 cal/g℃
Angle Acceptance SHG 1064 nm(mrad/cm)14.2 (Φ)  55.3 (θ)
Clear apertureCentre 90%
Chamfering of edge≤0.2 mm@45°
Edge breakage≤0.1 mm
Surface smoothness10/5
Side perpendicularity≤5′
Angle tolerance△θ≤0.25°, △ф≤0.25°
laser-damaged threshold: [GW/cm ]>0.5 for 1064 nm, TEM00, 10 ns, 10 HZ (AR-coated)
>0.3 for 532 nm, TEM00, 10 ns, 10 HZ (AR-coated)

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