RTP Crystal

RTP (Rubidium Titanyle Phosphate – RbTiOPO4) is an isomorph of KTP crystal which is used in nonlinear and Electro-Optical applications. It has advantages of high damage threshold (about 1.8 times of KTP), high resistivity, high repetition rate, no hygroscopic and no induced piezo-electric effect with electrical signals up to 60 kHz. Its transmission range is 350nm to 4500nm.

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Basic Properties:

Crystal StructureOrthorhombic
Cell Parametersa = 12.96 ?,b =10.56 ?, c =6.49 ?
Mohs HardnessAbout 5
Density  (g/cm3)3.6
Melting PointAbout 1000℃
Thermal Expansion Coefficients (/K)αx=1.01x10-5, α y =1.37x10-5
αz =-4.17x10-6
Sellmeier Equations (λ in μm)

nx2=2.15559 + 0.93307[1-(0.20994/λ)2] - 0.01452λ2

ny2=2.38494 + 0.73603[1-(0.23891/λ)2] - 0.01583 λ2

nz2=2.27723 + 1.11030[1-(0.23454/λ)2] - 0.01995λ2

Thermal-optical Coefficients (dλ/dT)-0.029 nm /℃
Electro-optical Conatants  (Y-cut)
r33=38.5 pm/V
r33=35 pm/V, r23=12.5 pm/V, r13=10.6 pm/V
Electrical ResistivityAbout 1011-1012ohm·cm
Static Half Wave Voltage at 1064 nm

4x4x20 mm: 1,600 V

6x6x20 mm: 2,400 V
9x9x20 mm: 3,600 V

Extinction Ratio>[email protected]



Growing OrientationAlong Y axis
Maximum Length (5x5mm2 aperture)25mm
Length Tolerance (mm)+0.5/-0.1
Width and Height Tolerance (mm)±0.1
Surface Quality20/10

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