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Pockel Effect Apparatus

Model: HO-ED-P-05B

Many crystals exhibit birefringence naturally. There are certain crystals which are not birefringent naturally but become birefringent by application of an electric field. This electro-optic phenomenon is called Pockel Effect.

Holmarc manufactures laboratory instrument for studying Pockel effect for Physics and engineering courses as a standard product (Model No: HO-ED-P-05B). In this instrument, a diode laser provides collimated light for the experiment. Lithium niobate is the electro-optic crystal used in the Pockel cell which is arranged between two polarizers. Carriages on an optical rail hold all modules including laser and detector on a straight-line path for the experiment. The spacing between the electrodes can be varied in order to use crystals of different dimensions.

The power supply module of the instrument can apply voltages up to 2 KV across the crystal. Experiment can be done by varying the applied voltage and recording the detector output reading at various voltage levels. The birefringence is increasing function of the applied voltage, so, transmission will be an oscillatory function of the applied voltage.



Experiment Examples

    To plot the graph and study the birefringence with respect to applied voltage in an electro optic crystal (Lithium niobate)

The birefringence (Dn) is increasing function of the applied voltage, so that the transmission will be an oscillatory function of the applied voltage.


Dn  =  λ  /  П L sin-1 √P  (  V  )  /  P (  V½  )


Dn  =  Birefringence

P (V½)  =  Intensity at Half wave voltage

P(V)  =  Intensity at applied voltage

L  =  Length of the crystal

λ  =  Wavelength of Light



Fig. Schematic Diagram


Related Topics

    Polarization

    Pockel effect

    Birefringence

    Half Wave Voltage
Features

    Enhanced and integrated design with drive voltage 0-2 KV

    Precise measurements

    Clear process observation and can study electro-optic effect

    High sensitivity pin hole photo detector

Intensity Vs Applied voltage


Scope of Supply


    Optical Rail

Model No: ED-P-05B-OR
Length
:
1000mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Kinematic Laser Mount

Model No: ED-P-05B-KLM
Material
:
Black anodized Aluminum alloy
Adjustments
:
Using 80 tpi lead screws
Adjustment Range
:
+/-4 degrees
Quantity
:
1 no.
Kinematic Laser Mount

    Polarizer Rotator with Mount

Model No: ED-P-05B-PRM
Material
:
Sheet Polarizer
Rotation
:
360 degree
Resolution
:
1 degree
Quantity
:
1 no.
Polarizer Rotator with Mount

    Polarizer with Precision Rotation

Model No: ED-P-05B-PPR
Material
:
Sheet Polarizer
Rotation
:
360 degree
Fine Rotation
:
15 degree
Resolution
:
0.1 degree
Quantity
:
1 no.
Polarizer with Precision Rotation

    Detector Mount with X- Translation

Model No: ED-P-05B-DMX
Material
:
Black anodized Aluminum alloy
Travel
:
Micrometer controlled
Resolution
:
0.01mm
Quantity
:
1 no.
Detector Mount with X- Translation

    Pockel Cell with Mount

Model No: ED-P-05B-PCM
Electrode Material
:
Copper
Cavity width
:
0-6mm Lead screw control
Cavity size
:
30 x 5 x 5 mm
Quantity
:
1 no.
Pockel Cell with Mount

    Electro-Optic Crystal

Model No: ED-P-05B-EOC
Material
:
Lithium Niobate (Li NbO3)
Dimension
:
25 x 4 x 4 mm
Quantity
:
1 no.
Electro-Optic Crystal

    Switched Mode Power Supply

Model No: ED-P-05B-SMPS
Input
:
230V 50 Hz
Voltage
:
0 - 2 KV
Quantity
:
1 no.
Switched Mode Power Supply

    Diode Laser with Power supply (Red)

Model No: ED-P-05B-DLPR
Wave length
:
650 nm
Optical power
:
3 mW
Quantity
:
1 no.
Diode Laser with Power supply (Red)

    Detector Output Measurement Unit

Model No: ED-P-05B-DOMU
Sensor Type
:
Photo Transistor
Display
:
7 segment, 3 ½ digit
Range
:
0 - 199 milli / micro amperes
Quantity
:
1 no.
Detector Output Measurement Unit

    Accessories

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