
Chapter 1: Cytometer Components 33
The sort collection chamber door should be kept closed when sorting into a plate.
The door keeps the chamber free of dust and other airborne particles, and seals
the chamber during aerosol evacuation for cytometers equipped with the AMO.
Optics System
The BD FACSAria II cytometer uses innovative designs for both the excitation
optics and collection optics. The optics can be viewed by opening the optics
access door and the flow cell access door.
Excitation Optics
The excitation optics consist of lasers, fiber optic cables, beam-shaping prisms,
and an achromatic focusing lens, as shown in Figure 1-16 on page 34. For
information about how signals are generated, see Signal Generation on page 48.
The BD FACSAria II cytometer uses low-powered, air-cooled and solid-state
lasers that do not have special power or cooling requirements. See Table 1-1 for
the laser choices. See Table 8-5 on page 257 for the laser specifications.
The flow cell access door is equipped with a shutter mechanism that shuts
off the laser light when the door is opened. To ensure there is no
interruption to data acquisition, do not open the door while sorting or
recording.
Table 1-1 Laser configurations
Laser Wavelength Comments
Blue 488 nm Standard
Red 633 nm Standard
Violet 405 nm Optional
Near UV
a
a. When both the near UV and violet lasers are installed, only one of them can be used at the same time. The
laser power toggle switch determines which laser is active.
375 nm Optional (Uses the same optical path and PMTs
as violet laser. See Appendix B on page 271.)
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