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RTP Crystals

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Growing Orientation Along Y-axis Maximum Length(5x5mm) 25mm
Length Tolerance +0.5 / -0.1 Width and Height Tolerance +/-0.1
Parallelism < 30″ Perpendicularity < 15′
Surface Quality 20/10 Coating AR-coated


Basic Properties:

Crystal structure Orthorhombic Cell Parameters a = 12.96 Å; b =10.56 Å;
c =6.49 Å
Mohs hardness About 5 Density 3.6 g/cm3
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 μm)
Thermo-optical Coefficients (dλ/dT) -0.029nm / °C
Electro-optic Constants (Y-cut)
r33=38.5 pm/V
r33=35 pm/V,r23=12.5pm/V, r13=10.6 pm/V
Electrical Resistivity About 1011-1012ohm·cm
Static Half Wave
Voltage at 1064nm
9x9x20mm: 3.600 V
Extinction Ratio >20dB@633nm

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. Hangzhou Shalom EO offers the custom RTP crystals upon customer's request. 
Reliable homogeneity and high laser damage threshold 
Non-hygroscopic and low absorption losses 
No acoustic ringing and stability over a wide temperature range(-60℃-+80℃)

Application Notes:

  1. SHG Nd: lasers at 1064nm
  2. Electro-Optical Q-switch and modulation for Optical waveguides
  3. Optical Parametric Amplifiers (OPA) and Oscillators (OPO) application