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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 Properties
Crystal structure:
Orthorhombic, Point group mm2Cell Parameters:
a = 12.96 Å; b =10.56 Å; c =6.49 Å Z=8Mohs hardness:
about 5Density:
3.6 g/cm³Melting Point:
about 1000°CThermal 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/°CElectro-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·cmStatic Half Wave Voltage at 1064 nm:
4x4x20 mm: 1,600 V6x6x20 mm: 2,400 V
9x9x20 mm: 3,600 V
Extinction Ratio:
>20dB @633nmNonlinear Optical Coefficients(pm/V):
d31=2.0, d32=3.6, d33=8.3, d24=3.6, d15=2.0Effective Nonlinearity:
deff(II)= (d24 - d15)sin2φsin2θ -(d15sin2φ+ d24cos2φ)sinθGeneral Specifications of RTP
Dimension Tolerance:
+0/-0.1mm(WxH) and +0.1/-0.2mm thicknessSurface Quality:
10-5 Scratch-digFlatness:
<λ/8 @633nmChamfer:
0.1mm@45deg.Clear Aperture:
Central 90% of DiameterParallelism:
<10 arc secondsPerpendicular:
<10 arc minutesOrientation Angle:
+/-0.25deg.Damage Threshold:
1 GW/cm2@1064nm10nsCoating:
AR coating: R<0.2%i. Commonly used RTP Crystal
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