random thoughts of an engineer

 As I'm a little tired with writing more about soalr project and I'm currently waiting for V2 PCBs to arrive I decided to go back to optics and experiment with it a bit. Teaser After listening to the laser lecture, I realized that all fluorescent substances are either 3 or 4 level systems, so in theory they should be capable of laser action (though most of them have their energy level lifetime's set in a way that makes it very hard to obtain laser action). From available and affordable dyes I found two that interested me the most:  Rhodamine B Chlorophyll Rhodamine B was used extensively in many dye lasers before. There're many materials available and results are almost guaranteed. On the other hand, chlorophyll doesn't seem to be studied extensively as a laser dye and the only paper I found is the following: https://www.researchgate.net/publication/269952977_A_Possible_Realization_of_Chlorophyll_Lase Those who know me can guess I chose the harder way. Chlorophyll p