Polarizer Principles
Meadowlark Optics DOWNLOAD PRINCIPLES Dichroic Polarizers Meadowlark Optics offers an
Pockels Cells Modulator
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Key Features
- Large clear apertures (40 mm)
- Suitable for imaging applications
- Symmetric nanosecond switching times
- Ideal for Imaging Polarimetry
- Excellent high-speed shutter
- Many LIDAR applications
A Pockels cell is an optical device capable of altering the polarization of light as an electric field is applied. By applying a variable electric voltage, the crystal’s phase delay (known as the Pockels effect) can be modulated. This effect was initially identified in the 19th century. Over time, it has evolved into a pivotal technology for various contemporary photonic applications, including ultra-fast lasers and precise light modulators.
These cells use electrically induced birefringence to swiftly, accurately, and consistently control powerful laser beams. The ability to generate short, high-power pulses is crucial in Q-switched lasers, with significant applications in:
- LiDAR (Light Detection And Ranging): used in commercial and military contexts as an optical radar.
- Laser metal processing: assisting cutting, welding, and drilling.
- Dermatology: offering less pain and faster recovery in the removal of spots or tattoos.
Pockels Cells Modulator
Our longitudinal Pockels Cells are often used in polarimetry on imaging light beams and in the chopping of polarized beams. They consist of Z-cut KD*P crystals between protective windows that have transparent indium-tin oxide electrodes applied to their interior faces. The electrodes produce a uniform electric field normal to the optical faces and permit use of a thin (approximately 3 mm) KD*P crystal.
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As shown on the response graph, the electric field creates a positive or negative retardance value depending on the instantaneous field direction.
The thin crystal additionally makes these cells suitable for use in non-collimated imaging light beams slower than f/20. Meadowlark specializes in clear apertures up to 40 mm. These devices are useful as variable retarders in applications requiring very fast switching.
Due to the wide variation in customer applications, Meadowlark is unable to provide a turn-key high voltage driver, but is pleased to help identify the critical voltage/current requirements.
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SPECIFICATIONS |
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Transmission |
≥ 90 % @ 633 nm |
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Quarter Wave Voltage (@ 633 nm) |
≤ 2200 V (linear w/wavelength) |
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Maximum Voltage |
± 4500 V |
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AC Voltage Modulation Range |
10 Hz Minimum (must be AC with no DC bias) |
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Nominal Capacitance |
~ 120 pF (25 mm) ~ 200 pF (40 mm) |
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Contrast Ratio |
≥ 1000:1 (Collimated Light) |
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Cell Dimensions |
Ø 2.25” x 1.01” (25 mm CA) Ø 2.95” x 1.18” (40 mm CA) |
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Operating Temperature |
+ 5 ⁰C to + 35 ⁰C |
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Response Time |
≤ 20 ns |
Ordering Information – Contact Us for a Quote
ORDERING INFORMATION | |
Part Number | Pockels Cell – 25 nm – λ |
Please note that power supply, cables and software are not included.
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