Our Miniaturized TTL Pulse Generators seamlessly integrate with our other optogenetics products. The pulse train parameters and its triggering are controlled via a graphical interface. The generator connects to a computer with a USB cable and to a LED driver or a shutter with a BNC cable. Any channel of a TTL pulse generator can be assigned to a LED driver, a light shutter or it can be used as a trigger for other channels.
Light emitting diodes (LEDs) coupled in an optical fiber are suitable for neuroscience experiments which need to bring the light into the brain. LED light allows to control the excitation, inhibition or signalling of specific cells in optogenetic experiments. The uniform illumination of an LED makes it the first choice in light sources for fluorescence miniature microscopy and fiber photometry techniques. Our compact Connectorized LEDs or multiple color combined LEDs are used with Doric programmable LED Drivers. We also offer LED Fiber Light Sources integrating 1, 2, or 4 independently controlled LEDs into the driver housing.
As LED lighting made it obvious, white light can be generated by blue LED pumping of phosphors or fluorescent crystals such as Cerium-doped YAG crystals (Ce:YAG). However, the relatively large emitting area of blue LEDs and their highly divergent light beams result in a fluorescent light source of very large optical etendue (emitter area times light beam divergence) unsuitable for effective fluorescence coupling into small core optical fibers. Optogenetics and other life science applications require tens of milliwatts of suitable bandwidth into the small core diameter of optical fibers. Consequently, we designed fluorescent light sources, called the Ce:YAG Fiber Light Sources, in which a Ce:YAG crystal is pumped over a very small area with multiple high-power blue laser diodes instead of LEDs. This patent pending laser diode pumping geometry creates a small area fluorescence light emitter. This is optimized for efficient coupling into the small core diameter of optical fibers, unlike the LED based light sources and other technologies such as arc lamps and incandescent lamps.