The cheapest way I’d think to generate a visible frequency comb would be to frequency double the IR comb laser using a nonlinear crystal like BBO.
Also here the accuracy is relative and not absolute which is fine for communications. The absolute accuracy of the comb may not good enough for spectroscopy in the visible.
I had, maybe naively assumed that laser diodes were switched on/off electronically to modulate a signal. With this laser you’d have to modulate after the light source somehow ?
Do you mean modulating multiple bands of light, as a TV does with broad-bands of R, G, & B? Do you mean time-band modulation of a single band, like radios do with AM?
" We show microcombs with total on-chip power levels up to 158 mW and comb lines with an intrinsic linewidth as narrow as 200 kHz."
150mW is a lot for a single-chip laser, given that the eye safety limit for standard red laser pointers is about 5mW.
Tricorders ftw
Almost like a storage room, except with as much operational, calibrated equipment at the fingertips as the working room would possibly fit.
Regardless of the essential auxiliary storage space having at least 5x the square footage of the working lab itself. Where hopefully at least 20% of the equipment there is operational, if not currently calibrated or in use. Which would then equal the amount in operation in the lab.
If the storage area is down the hall, or maybe in the basement, or a convenient nearby building, the same breakthroughs will be possible by the same researchers.
It will just take more time the further the storage area is, and the more pieces of equipment for which there is no backup in storage.
And way more time if at all, when the storage area is too small to get the job done.
Anything less and you're shooting yourself in the "footage" :)
>Cleaning up messy light
Or cleaning up your messy lab, you can have both, you just have to prioritize what you want to accomplish more of in your lifetime.
https://en.wikipedia.org/wiki/Fizeau%27s_measurement_of_the_...
in the Physics 510 lab, the idea is that you send light through a system of mirrors through such a long path that a slot in a rotating disc (or a mirror) can move enough to block the light or maybe not block the light if it can rotate all the way to the next opening. Unlike Fizeau we did it entirely indoors and the experiment depends on empty space.
The aux storage areas are not where the overlaid layers of equipment on and around the benches would be as immediately useful. Plus, most importantly the storage rooms are supposed to already be full to the gills so you can hardly walk inside them ;) Containing equipment from which thousands of hours of learning has been gleaned beforehand.
In both, you often need as much stuff squeezed into a small space as possible before you can come near the goal line.
I'll take scientific progress that's good enough to emerge from the lab over a "clinical" appearance of the lab itself any day.
hdjfjkremmr•3mo ago
brookst•3mo ago
mezzman•3mo ago