B&W Tek - Model FRS -Fiber Optic Round-to-Slit Converter

When a large core fiber is placed in front of the entrance slit of a spectrometer, the majority of the light is vinyetted and doesn’t make it into the spectrometer.

This design allows for precise alignment with the spectrometer`s entrance slit, resulting in enhanced light throughput. This is achieved by utilizing many smaller fiber cores over a larger single one. Enhance sensitivity and signal to noise without sacrificing resolution - even with a narrow slit.

It is important to note that proper alignment of the stacked fiber to the spectrometer’s slit is crucial to achieve the highest signal.