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Miniature Pockels Cells for Laser Q-Switching

Miniature 8mm KD*P Pockels cells for Q-switching

The compact Pockels cell models EM508M-EM512M have for many years satisfied the needs of our customers for smaller (compared to the EM500 range) Pockels cells for OEM applications. With size constraints becoming ever tighter, Leysop has developed a smaller model still, the EM510C. This cell is intended predominantly for Q-switching applications, although of course it could find other uses anywhere a more modestly sized longitudinal field KD*P based Pockels cell is desired.

What then are the differences between this cell and the EM500M series? Obviously the first difference is size. The EM500M cells are in a (sort of de-facto industry standard) 35mm diameter package. The miniature EM510C is in a 25mm diameter package instead.

Secondly, although listed as an EM510C, the cell in fact offers a clear working aperture of 8mm from a 10mm diameter crystal; the working aperture is defined by a ceramic disc.

Thirdly, although it is technically possible to provide the cell in either fluid filled or dry construction, Leysop does not believe that the smaller package provides room for a sufficiently sized air bubble to allow for adequate thermal expansion under the sort of operating conditions in which an OEM laser Q-switch might be found. Therefore, Leysop offers the EM510C only as a dry cell with anti-reflection coated crystal and windows.

Leysop is not able to stock a wide range of windows for alternative operating wavelengths in the particular size used for this cell. It is for this reason that the EM510C is offered only as standard for the wavelength range 1030-1064nm which is the range over which the stock windows perform optimally. Other wavelengths will be available by special order, but please note that costs are higher for this option.

Specifications

Parameter EM510C
Aperture: 8mm
Wavelength Range: 1030-1064nm
Halfwave Voltage @ 1.06μm: Approximately 6.2 kV static, 7.5kV dynamic
Maximum Voltage: 8kV
Optical Rise Time: < 1.0 ns
Contrast Ratio @ 1.06μm: > 1000:1
Capacitance Unterminated: < ~5 pF
Damage Threshold: 600 MW/cm2
Insertion loss with AR Coatings: 4%
Physical Dimensions: 25mm - 43mm long
Interface Drawings: