For biology applications, a laser beam is used for cell stimulation. First the beam is focused onto dual mirrors then to the cells. Holding the laser beam onto the cell is very difficult to achieve due to thermal effects or external vibration, so the position of the laser beam needs to be controlled in real-time to track the motion of the cell. To achieve this, a system with two piezo-driven mirrors and two position-sensitive four-quadrant diodes is used. The mirrors adjust a laser beam in any direction defined by the four-quadrant-diodes. The signals are used to operate a PKS1 piezostage for stabilizing the position of the laser beam on the cell. Regulation of the controller requires frequencies up to 100 Hz while the piezo stage needs to be three to five times faster than the frequency. The mirror tip- and tilting piezostage PKS1 adjusts the direction of the mirror in milliseconds with a frequency between 300 Hz and 1 kHz. For a coarse adjustment the tilting platform can be moved up to ±2º manually. For more details and a datasheet, visit:
• http://www.piezosystem.com/nanopositioning/piezo_actuators/mirror_tilting_systems/pks_1
• http://www.piezosystem.com/fileadmin/datasheets/Mirror_Tilting_Positioners/Mirror-Tilting-System-PKS_1.pdf
piezosystem jena Inc.
Hopedale, MA 01747
508-634-66 88
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http://www.piezojena.com
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