Experiment in IR imaging

Here I tried an experiment to image the infrared laser that becomes frequency quadrupled. With a long digital camera exposure, I waved a fluorescing IR viewer card around in the upper ring cavity for several seconds and then pulsed on the blue light for just a second or so in order to avoid over-exposure. Out of five attempts this one showed the most beam detail.

 

See this photo for details.

 

More photos of this system: (1) (2) (3) (4)

Done