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

Basic Properties

Crystal structure Orthorhombic
Cell Parameters a = 12.96 Å; b =10.56 Å; c =6.49 Å
Mohs hardness About 5
Density (g/cm3) 3.6
Melting Point: About 1000 ˚C
Thermal Expansion Coefficients (/K) αx=1.01x10-5, αy =1.37x10-5, αz =-4..17x10-6
Sellmeier equations (λ in um) 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
Thermo-optical coefficients (dλ/dT) -0.029 nm / °C
Electro-optic constants Y-cut: r33=38.5 pm/V,X-cut: r33=35 pm/V, r23=12.5 pm/V, r13=10.6 pm/V
Electrical Resistivity About 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 >20dB@633nm


Growing Orientation Along Y-axis
Maximum length (5 x 5 mm2) 25 mm
Length tolerance, mm +0.5 / -0.1
Width and heighth tolerance, mm +/- 0.1
Parallelism < 30″
Perpendicularity < 15′
Surface quality 20/10
coating AR-coated




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