RTP for EO

RTP (Rubidium Titanyl Phosphate, RbTiOPO4) crystal features,

Large electro-optic coefficients
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

making it an excellent material for E-O Q-switch at high repetition rates. RTP crystals are typically used in "thermally compensated double-crystal configurations" in which two matched crystals are placed along the propagation axis with one rotated by 90 deg. from the other (see the "Tech info" tab for more details).

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Part No.	Description	Application	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	Price	Availability	Add to Cart

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=12.96 Å, b=10.56 Å, 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	α1=1.01x10^-5, α2=1.37x10^-5, α3=-4.17x10^-6
Dielectric constant	ε_eff=13
Ionic conductivity	~10^-8 s/cm (c-axis, @ 25 ^oC, 10 kHz)

Linear Optical Properties:

Transmitting Range:	350 nm - 4500 nm
Refractive Indices: 1064 nm 532 nm	nx ny nz 1.7673 1.7760 1.8574 1.8098 1.8227 1.9310
Sellmeier Equations: (λ in µm)	nx²=2.1556+0.93307λ²/(λ²-0.20994)-0.01452λ² ny²=2.3849+0.073603λ²/(λ²-0.23891)-0.01583λ² nz²=2.27723+1.11030λ²/(λ²-0.23454)-0.01995λ²
Thermo-optic Coefficients:	dnx/dT= - /^oC, dny/dT= - /^oC dnz/dT= - /^oC ( N/A)
Absorption Coefficient:	α < 0.05% cm^-1 @ 1064 nm, α < 4% cm^-1 @ 532 nm

Electro-Optical and Nonlinear Optical Properties:

Electro-optic Coefficients ( x-cut, low frequency )	γ13=10.5 pm/V, γ23=12.5 pm/V, γ33=35.0 pm/V
Half-wave Voltage@1064nm	1.6 kV for a pair of 4x4x10 mm crystals
	3.4 kV for a pair of 6x6x7 mm crystals
	2.4 kV for a pair of 6x6x10 mm crystals
Nonlinear Optical Coefficients	d31=2.0 pm/V, d32=3.6 pm/V, d33=8.3 pm/V,d24=3.6 pm/V, d15=2.0 pm/V
Effective Nonlinearity	deff(II)= (d24 - d15)sin2φsin2θ -(d15sin2φ+ d24cos2φ)sinθ

Specifications for RTP components:

Transmitting wavefront distortion: less than λ/8 @ 633 nm

Dimension tolerance: (W +/- 0.1 mm) x (H +/- 0.1 mm) x (L + 0.2 mm/-0.1 mm)

Clear aperture: > 90% central area

Flatness: λ/8 @ 633 nm

Scratch/dig: 10/5 to MIL-O-13830A

Parallelism: better than 20 arc seconds

Perpendicularity: 30 arc minutes

Angle tolerance: Δθ < +/-0.25o, Δφ < +/-0.25o

Paired crystals:

RTP crystals for EO modulation are typically used in "thermally compensated double-crystal configurations" as show below, in which two matched crystals are placed along the propagation axis with one rotated by 90 deg. from the other. The equivalent length of the EO modulator is 2 x of the individual crystal length.

Coatings:

The crystals are anti-reflection (AR) coated on the entrance/exit faces at the specified central wavelength. Gold (Au) coatings are deposited on Z-faces for the high voltage electrodes. Uncoated crystals are available upon request.

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