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 LED packages are used with Doric programmable LED Drivers. We also offer LED Fiber Light Sources integrating single or multiple LEDs into the driver housing.
As LED lighting made it obvious, visible light can be generated by LED pumping of phosphors or fluorescent crystals such as Cerium-doped YAG crystal (Ce:YAG). However, the relatively big emitting area of pumping LEDs and highly divergent light cone of fluorescence emission result in light sources of very large optical etendue (product of emitter size and light cone) that are not suitable for effective coupling into small core diameter optical fibers required in optogenetic experiments and elsewhere. Consequently, we designed a fluorescent light source, called the Ce:YAG Fluorescence Light Source, in which a Ce:YAG crystal is pumped with multiple high-power blue laser diodes instead of blue LEDs. This concentrates excitation and fluorescence emission in a very small area of the Ce:YAG crystal. As shown in the figure below, this patent pending laser diode pumping geometry significantly increases the fiber coupling efficiency compared to conventional light sources such as incandescent lamps or LED based light sources.