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RbTiOPO4(RTP) crystal is a kind of nonlinear optical crystal material with excellent comprehensive properties. RTP is currently the most commonly used type of practical electro-optic crystals with high frequency repetition, high power and narrow pulse width laser Q switching. RTP electro-optical devices are not only used in laser micromachining and laser ranging, but also in major scientific exploration projects because of their excellent comprehensive performance.

RbTiOPO4(RTP)—a crystal with large nonlinear optical coefficient, large electro-optical coefficient, high photoresist damage threshold and stable physical and chemical properties

The growth temperature ranges from 950 °C to 800 °C and the growth period is usually between 45 and 60 days.As RTP is transparent from 0.4 to 3.5 μm, it can be used in multiple types of laser such as Er:YAG laser at 2.94 μm with fairly good efficiency. Bulk absorption measurements at 1.064 μm range from 50 to 150 ppm using Photothermal Common Path Interferometer.

Available aperture(mm)
Pockels cell size(mm)
Dia20/25.4*35( Clear aperture 3*3,4*4,5*5)


Chemical formula RbTiOPO4
Crystal structure Orthorhombic
Point group mm2
Lattice parameters, Å a 12.96
b 10.56
c 6.49
Density, g.cm-3 3.6
Resistivity (20°C, 20% Humidity), Ohm.cm 1012
Aperture, mm2 from 2×2 to 9×9
Length, mm up to 10
Dimension tolerance ±0.1 mm
Flatness <l/8 @633 nm
Surface quality Scratch/Dig 10/5
Parallelism better than 30 arc sec
Perpendicularity better than 30 arc min
Angle tolerance △q < 0.5°, △f < 0.5°
Coating AR coatings
Clear aperture >90% central area
Transmitting wavefront distortion less than l/8 @ 633 nm Dimension
Melting Point ~ 1000 °C
Ferroeletric transition temperature ~810 °C
Mohs Hardness ~5
Thermal Expansion Coefficients, /°C a1=1.01×10-5, a2=1.37×10-5, a3=-4.17×10-6
Hygroscopic Susceptibility No
Ionic conductivity (room temperature, 10 kHz) 10-8 S/cm



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