RTP (Nonlinear Crystal)

RTP (Nonlinear Crystal)

RTP (rubidium titanyl phosphate) nonlinear crystal is an excellent nonlinear optical crystal, an isomorph of potassium titanyl phosphate (KTP), with a large nonlinear optical coefficient and a wide near-mid-infrared transmittance range. 

Due to its high resistivity, low-voltage electrical effect, high resistance to laser damage threshold, and resistance to deliquescence, it is widely used in optoelectronic technology fields such as electro-optic modulation and laser Q-switching. 

Using the 1.0 μm band laser to pump the non-critical phase-matched cut RTP nonlinear crystal and its isoforms, an efficient 1.5-1.6 μm band eye-safe laser can be obtained, which has important applications in the field of nonlinear optical frequency conversion.

Features of RTP Nonlinear Crystal:

  • Not deliquescence
  • Small volume
  • High resistivity
  • High extinction ratio
  • No piezoelectric effect
  • Wide transparency range
  • High damage threshold
  • Stability at high temperature
  • Low half-wave voltage
  • Suitable for high frequency operation
  • Stable mechanical and chemical properties
  • Large nonlinear optical and electro-optical coefficients

Physicochemical Properties

AttributeNumerical
Chemical FormulaRbTiOPO4
Crystal StructureOrthorhombic System
Point Groupmm2
Lattice Constant Åa =12.96,
b= 10.56,
c= 6.49
Density,g.cm-33.6
Resistivity(20°C,20%Humidity),Ω·cm1012
Aperture,mm2From the 2 x 2 to 9 x 9
Length,mmup to 10
Size Tolerance±0.1 mm
Flatness<λ/8 @633nm
Surface FinishScratch/Dig 10/5
Parallelism≤ 30 arc sec
Verticality≤ 30 arc min
Angle Tolerance△q < 0.5°, △f < 0.5°
CoatingAR coatings
Clear Aperture>90% central area
Transmission Wavefront Distortionless than l/8 @ 633 nm Dimension
Melting Point~ 1000 °C
Ferroelectric Transition Temperature~810 °C
Mohs Hardness~5
Coefficient of Thermal Expansion,/°Ca1=1.01×10-5,
a2=1.37×10-5
a3=-4.17×10-6
HygroscopicNo
Ionic Conductivity(Room Temperature,10 kHz)10-8 S/cm

Linear Optical Properties

Transparent Range350nm—4500nm
Thermal Coefficient of Light (dλ/dT)-0.029 nm /℃
Extinction Ratio>20dB@633nm
Sellmeier Equationnx2=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

Electro-optical Properties

ResistivityAbout1011-1012ohm·cm
Electro-optic Constantr33=38.5pm/VY cutting
r33=35pm/VX cutting
r23=12.5pm/V
r13=10.6pm/V
Half Wave Working Voltage @1064nm Static4x4x20mm: 1600V
6x6x20mm: 2400V
9x9x20mm: 3600V

Spectrum

RTP parameters CRYLINKRTP transmission CRYLINK
Phase matching parameters of RTP-OPO in xz main plane at 1.08μm pumpingTransmission spectrum of coated RTP crystal

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