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RTP Crystal & Its Applications

RTP (Rubidium Titanyl Phosphate, RbTiOPO4) is an isomorph of KTP crystal, primarily used in the fields of nonlinear and electro-optics. RTP crystal exhibits a higher damage threshold than that of KTP(~1.8 times), high resistivity, high repetition rate, are non-hygroscopic, and do not induce piezoelectric effects with electrical signals up to 60 kHz. The transmission range of RTP crystal is 350nm to 4500nm.

When RTP crystals are used for electro-optic modulation, equivalent pairs are typically employed for thermal compensation. In this configuration, two matched crystals are placed along the propagation axis, with one crystal rotated 90 degrees relative to the other. The equivalent length of the RTP pair can compensate for birefringence and thermal effects.

RTP Crystal

RTP Crystal Properties

Crystal structure:
Orthorhombic, Point group mm2
Cell Parameters:
a = 12.96 Å; b =10.56 Å; c =6.49 Å Z=8
Mohs hardness:
about 5
Density:
3.6 g/cm³
Melting Point:
about 1000°C
Thermal Expansion Coefficients (/K):

α(x) = 1.01x10E-5, α(y) = 1.37x10E-5, α(z) = -4.17x10E-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] - 0.01583λ²
nz²=2.27723 + 1.11030[1 -(0.23454/λ)²] - 0.01995λ²
Thermo-optical coefficient:
dn/dT = -0.029/°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 1011-1012 ohm·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
Nonlinear Optical Coefficients(pm/V):
d31=2.0, d32=3.6, d33=8.3, d24=3.6, d15=2.0
Effective Nonlinearity:
deff(II)= (d24 - d15)sin2φsin2θ -(d15sin2φ+ d24cos2φ)sinθ

General Specifications of RTP

Dimension Tolerance:
+0/-0.1mm(WxH) and +0.1/-0.2mm thickness
Surface Quality:
10-5 Scratch-dig
Flatness:
<λ/8 @633nm
Chamfer:
0.1mm@45deg.
Clear Aperture:
Central 90% of Diameter
Parallelism:
<10 arc seconds
Perpendicular:
<10 arc minutes
Orientation Angle:
+/-0.25deg.
Damage Threshold:
1 GW/cm2@1064nm10ns
Coating:
AR coating: R<0.2%

i. Commonly used RTP Crystal

RTP crystal 4x4x10mm, X-cut, both surfaces AR@1064nm, two Z-faces gold electrode coating
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    • RTP crystal 4x4x10mm, Y-cut, both surfaces AR@1064nm, two Z-faces gold electrode coating
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