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Compact Pockels Cells for Laser Q-switching

Miniature 8mm KD*P Pockels cells for Q-switchingLeysop Compact Pockels Cells are especially suited to OEM laser equipment manufacture where a smaller size and simpler interconnect are needed. Both 8mm and 10mm aperture versions are currently available, but any aperture may be accommodated by this general style of packaging.

Manufactured in both single and double crystal versions

The EM500 range of longitudinal field Pockels cells have been designed to offer the best possible performance in a package which as far as possible encloses the active region of the optical crystal in an earthed metallic casing. This provides good electrical shielding for reduced radiated emissions, and increases user safety.

A further safety feature is the use of special high voltage rated HV BNC electrical connectors which have extended shields on the mating plugs which reduce the potential risk of electrical shock should the user handle the live cables when not connected to the Pockels cell. Although this arrangement provides many advantages to the user of these Pockels cells in an open environment (such as on an optical table in a research laboratory) it does increase the physical size of the Pockels cell.

For the manufacturer of Q-switched laser systems, the volume and mass of the optical components is often a major consideration, while issues such as radiated emissions and user safety are handled by the equipment enclosure into which the laser system is built. Size and weight therefore can take a higher priority for this user. Leysop produces a range of compact Pockels cells which lack the bulky machined aluminum alloy housings of the EM500 series and use simpler pin or M4 stud contacts for the electrical connection. This connection reduces the load capacitance of the cell by eliminating the capacitance of the HV BNC connector which is in parallel with the active element.

These devices are housed in an industry standard 35mm diameter design which allows this Q-switch to drop in to many existing laser head designs without modification. The device can be supplied with special end caps and also fitted wave-plates if required. We are always happy to discuss any custom requirements for this OEM Q-switch.

Specifications:

Parameter EM508M EM510M
Aperture: 8mm 10mm
Wavelength Range: 0.3 - 1.2μm 0.3 - 1.2μm
Halfwave Voltage @ 1.06μm: 6.0 kV 6.0 kV
Maximum Voltage: 10kV 10kV
Optical Rise Time: < 1.0 ns < 1.0 ns
Contrast Ratio @ 1.06μm: > 1000:1 > 1000:1
Capacitance Unterminated: < 5 pF < 5 pF
Damage Threshold: 600 MW/cm2 600 MW/cm2
Insertion loss with AR coatings: 4% 4%
Physical Dimensions: 35mm - 37mm long 35mm - 42mm long
Download Drawings Click here to download an interface drawing in pdf format of the compact 8mm Pockels cell Click here to download an interface drawing in pdf format of the compact 10mm Pockels cell

 

Compact Double Pockels Cell

An exciting recent addition to Leysop's compact Pockels cell range is the two crystal or double Pockels cell version. This uses two identical crystals, mounted optically in series but electrically in parallel to provide a halving of the required switching voltage when compared to a single crystal unit.

The same 35mm diameter is used which makes for easy replacement in a system built for the single crystal unit, but naturally the total length is greater at 59mm. Also, the capacitance is approximately doubled and the insertion loss is slightly greater at around 6%. As with all Leysop Pockels cells, this may be supplied either filled with an inert index matching fluid (preferred) or may be supplied dry with or without anti-reflection coatings on the crystal faces. For dry cells, a small wedge angle may be applied to the crystals to reduce interference effects if required. Options of pin contact or M4 stud contacts are also available on this unit.

Download drawing of a compact double crystal 8mm aperture Pockels cell.

Application Notes for Pockels Cells:

The Linear Electro-Optic Effect
Selecting the Right Pockels Cell
Setting Up the Q-Switch
Pulse Slicing with Pockels Cells
Pulse Picking with 4 Terminal Pockels Cells