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RTP (Rubidium Titanyl Phosphate, RbTiOPO4 )
For electro-optical application, RTP does not induce piezo-electric ringing with electrical signals up to the MHz range. More over, its has large E-O coefficients, high electrical resistivity, and high damage threshold making it an excellent material for E-O Q-switch at high repetition rates.
RTP crystal may also be used for second harmonic generation of ~ 1 µm or in optical parametric processes to generate 3 µm radiation. |
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Lasertec's RTP features
 Large electro-optic coefficients
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Large nonlinear optical coefficients |
No piezoelectric ringing to the MHz range |
Low operating voltage for Q-Switch |
Low ionic conductivity |
Nonhygroscopic, chemically and mechanically stable |
High damage threshold |
RTP is a positive biaxial crystal, with the principal axes X, Y, and Z ( nz>ny>nx ) parallel to the crystallographic axes a, b, and c, respectively.
Structural and Physical Properties
Crystal structure |
Orthorhombic. Point group mm2 |
Cell parameters |
a=12.96Å, b=10.56Å, c=6.49 Å, Z=8 |
Melting point |
1000 oC |
Curie point |
810 oC |
Mohs hardness |
~ 5 |
Density |
3.6 g/cm3 |
Color |
colorless |
Hygroscopic susceptibility |
no |
| Thermal expansion |
a1=1.01x10-5, a2=1.37x10-5, a3=-4.17x10-6 |
| Dielectric constant |
eeff=13 |
Ionic conductivity |
~10-8 s/cm (c-axis, @25 oC, 10kHz) |
Linear Optical Properties:
Transmitting range: |
350 nm - 4500 nm |
Refractive indices:
1064nm
532nm |
nx ny nz
1.7673 1.7760 1.8574
1.8098 1.8227 1.9310 |
Sellmeier equations:
(l in mm) |
nx2=2.1556+0.93307l2/(l2-0.20994)-0.01452l2
ny2=2.3849+0.073603l2/(l2-0.23891)-0.01583l2
nz2=2.27723+1.11030l2/(l2-0.23454)-0.01995l2 |
Thermo-optic coefficients: |
dnx/dT= - /oC, dny/dT= - /oC
dnz/dT= - /oC ( N/A) |
Absorption coefficient: |
a < 0.05% cm-1 @1064nm, a < 4% cm-1 @532nm |
Electro-Optical and Nonlinear Optical Properties:
Electro-optic coefficients
( x-cut, low frequency ) |
r13=10.5pm/V, r23=12.5pm/V, r33=35.0pm/V |
| Half-wave voltage@1064nm |
1.6 kV for a pair of 4x4x10mm crystals |
| 3.4 kV for a pair of 6x6x7mm crystals |
| 2.4 kV for a pair of 6x6x10 mm crystals |
| Nonlinear optical coefficients |
d31=2.0pm/V, d32=3.6pm/V,
d33=8.3pm/V,d24=3.6pm/V,
d15=2.0pm/V |
| Effective nonlinearity |
deff(II)= (d24 - d15)sin2fsin2q -(d15sin2f + d24cos2f)sinq |
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Standard Products
Part No. |
Dimension |
Application |
Coatings |
RTP0410 |
4x4x10mm |
EO @ 1064 nm |
AR@ 1064nm, Au on sides |
RTP0453 |
4x4x5.3mm |
EO @ 1064 nm |
AR@ 1064nm, Au on sides |
RTP0607 |
6x6x7mm |
EO @ 1064 nm |
AR@ 1064nm, Au on sides |
Specifications for finished RTP
| electrical resistivity: 1.0X10^13 |
| Dimension tolerance: (W +/- 0.1 mm) x (H +/- 0.1 mm) x (L + 0.2 mm/-0.1mm) |
| Transmitting wavefront distortion: less than l/8 @ 633 nm |
| Clear aperture: > 90% central area |
| Flatness: l/8 @ 633 nm |
| Scratch/dig: 10/5 to MIL-O-13830A |
| Parallelism: better than 20 arc seconds |
| Perpendicularity: 30 arc minutes |
| Angle tolerance: Dq < +/- 0.25o, Df < +/-0.25o |
Coatings
Standard anti-reflection coatings at the entrance/exit sides are available. Gold coatings may be deposited on the sides for HV electrodes. Other coatings are also available upon request.
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