RTP (Rubidium Titanyle Phosphate – RbTiOPO₄) is an isomorph of KTP crystal which is used   in nonlinear and Electro Optical applications. The electrochromism is not observed under a   continuous 1000V/mm Z-directed electric field over more than 1000 hours.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.

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

   Specifications

Dimension tolerance:	±0.1mm
Flatness:	λ/8 @633nm
Surface quality: Scratch/Dig	10/5
Parallelism:	better than 20 arc sec.
Perpendicularity:	better than 15 arc min
Angle tolerance:	< +/-0.5°
AR coating:	AR coatings
Clear aperture:	>90% central area
Transmitting wavefront distortion:	less than λ /8 @ 633nm

   Standard products

Part No.	Sizes	Application	Coating
RPS2205	2*2*5mm	For SHG	AR Coating
RPS3305	3*3*5mm	For SHG	AR Coating
RPE3310	3*3*10mm	For E-O switch	AR Coating
RPE4410	4*4*10mm	For E-O Switch	AR Coating

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