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  • LiNbO3 and MgO:LiNbO3 Pockels Cells
  • LiNbO3 and MgO:LiNbO3 Pockels Cells
  • LiNbO3 and MgO:LiNbO3 Pockels Cells
  • LiNbO3 and MgO:LiNbO3 Pockels Cells

LiNbO3 and MgO:LiNbO3 Pockels Cells

  • Low Half Wave Voltage
  • High Electro-Optical Coefficients
  • Work in Transverse Mode
  • Long Wavelength up to 4μm
  • Preferable for Er:YAG, Ho:YAG and Tm:YAG lasers
  • To check the stock list of LiNbO3 and MgO:LiNbO3 Pockels Cells, please click here
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Modules or Types:

Aperture 2.5mm

5mm

8mm

9mm

Shell Size φ20 x 66mm φ25.4 x 36mm φ30/32 x 26/30mm φ31/32 x 26mm
λ/4 Voltage 400V λ/2 @ 633nm 800V λ/2 @ 633nm 1800V-1900V λ/4 @1064nm 2100V λ/4 @ 1064nm
Overall Transmittance >98% >98% >98% >98%
Insertion Loss 3% 3% 3% 3%
Output Tuning Q Energy 100mJ 100mJ 100mJ 100mJ
Crystal Through Distortion λ/4 @ 633nm λ/4 @ 633nm λ/4 @ 633nm λ/4 @ 633nm
Flatness λ/8 @ 633nm λ/8 @ 633nm λ/8 @ 633nm λ/8 @ 633nm
Extinction Ratio 200:1 at 5mm section 200:1 at 5mm section 200:1 at 5mm section 200:1 at 5mm section
Capacitance 5pF 5pF 5pF 5pF
Damage Threshold 100MW/cm2 1064nm 10ns 10Hz (LN switch)
300MW/cm2 1064nm 10ns 10Hz (MgO: LN switch)

 

Specifications:

Aperture Min. 5x5mm Max. 20x20mm Length ~60mm
Orientation 12 arc min Flatness λ/8 @ 633nm
Wave Front Distortion λ/4 @ 633nm Parallelism < 20 arc sec
Perpendicularity < 5 arc sec Surface Quality 10/5 after coating 20/10
Wavelength 300-3000nm
LiNbO3 and Mgo: LiNbo3 crystals have been extensively integrated in optical communication and optical waveguide technology on the account of its excellent electro-optical characteristics and they are low cost photoelectric materials with good mechanical and physical properties. The electro-optic effect of LiNbO3 crystals is utilized for electro-optical modulations.
Lithium Niobate crystals  have become one of the most commonly used material for Q-switches and phase modulators for its high Electro-Optical coefficients  attributed by their large electro-optic coefficients, non-hygroscopicity, good transmission up to 4.0 µm and operation in transverse mode. With an electric field is applied transversely to the direction of light propagation, LiNBO3 cells can be configured to operate at a comparatively lower voltage than KD*P cells. LiNbO3 pockel cells could support operations in infrared wavelengths up to 4.0 µm, and are also good choices for applications in low and medium power solid-state lasers ( Er:YAG, Ho:YAG, Tm:YAG pulsed lasers). Damage threshold could be problematic for Lithium Niobate at short wavelengths because of color center formation. Above 800nm, however, the problem effectively attenuates and the material then has a very good damage threshold. On the other hand, LiNbO3 with Mgo doping has significantly higher damage threshold than conventional LiNbO3 without doping. 
Hangzhou Shalom EO offers the pockels cells made from LiNbO3 crystals and MgO:LiNbO3 crystals, with aperture size of 2.5mm to 9mm. The LiNbO3 and MgO:LiNbO3 crystals with Cr-Au electrode for electro-optical modulators or pockels cells are also offered. To check the stock list of LiNbO3 and MgO:LiNbO3 Pockels Cells, please click here.

Features:

    • Wide range of transparency (420 nm to 5200 nm)
    • Large electro-optical coefficients and low loss
    • Stable mechanical and chemical properties
    • High temperature stability and low wavefront distortion

    Applications:

    • Q-switching compact Nd+ lasers such as range-finders
    • Target designators 
    • Medical  and industrial lasers

    Side physical effcets of Pockels cells:

    When it comes to practical applications of Pockels cells, one may need to take some additional side effects into account:

    • Etalon effects may still exists and affect the optical performance if the beam direction is perpendicular to the faces of crystal, Even when the end faces of the crystal are coated with high-quality AR coatings.
    • Temperature could significantly affect the obtain phase changes.For example, a Pockels cell which is set to generate perfect high-contrast amplitude modulation, may require readjustments of the operation voltages when the temperature changes. However there are thermally compensated double crystal designs may circumvent the problem.
    • For operation with large beam radius, it is worth paying attention to sort out an optimized design for electrodes (possibly with additional auxiliary electrodes for high uniformity of the generated electric field, as otherwise one may obtain a spatially varying modulation).
    • Nonlinear crystals often exhibit substantial piezo-electric and elastooptic effects, which can have substantial influences on the performance at high modulation frequencies.
    • Operating at high power levels, thermal effects may be induced by residual absorption of the crystal . Therefore materials with lower absorption are preferable for high power applications
    • The crystals used in Pockels cells are nonlinear crystal materials, they inherently demonstrates considerable optical nonlinearities. For instance, self-phase modulation and nonlinear self-focusing might occur for light pulses with substantial peak power.
    LiNbO3 Crystals

    LiNbO3 Crystals

    • Wide Wavelength range up to 3μm 
    • Applications: OPO, QPM, Pockels Cells, Q-switch and phase modulator, waveguides.
    • Crystals Ingot, blanks and polished substrates available
    ...

    MgO:LiNbO3 Crystals for EO Applications

    MgO:LiNbO3 Crystals for EO Applications

    • Low Half Wave Voltage
    • High Electro-Optical Coefficients
    • Brewster for laser of low amplification
    • Higher Damage Threshold than none doping LiNbO3
    • Preferable for Er:YAG, Ho:YAG and Tm:YAG lasers
    ...