Fiber focusing device for flow cytometry, genetic sequencing by Micro Laser Systems

The Fiber Focuser from Micro Laser Systems (Garden Grove, CA) can generate micron spot sizes at long working distances in applications such as flow cytometry and genetic sequencing. They work with singlemode-type fiber in the 350-2300 nm wavelength range. The company's Interchangeable Focusing Cells screw on to the main collimator to provide a way to define a focused spot—for example, a <20 mm spot at 100 mm. The focuser's optical materials eliminate or minimize any fluorescence generated by some optics. There is no epoxy in the optical path, and an all-stainless-steel housing construction minimizes temperature effects.