Re: ultra small spectrometer yields the power of a 1000 times bigger device

On 25/10/2024 16:58, john larkin wrote:

On Fri, 25 Oct 2024 03:41:52 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
 

Ultra-small spectrometer yields the power of a 1,000 times bigger device
The tiny, relatively inexpensive devices could be used for customized astronomy research
https://www.sciencedaily.com/releases/2024/10/241023130905.htm
Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for anything from detecting disease to observing stars in distant galaxies.
>
Seems a clever way to do, see picture of it here:
https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

 I want the opposite, a super broadband spectrometer, maybe 1800 to 300
nm, to test laser diodes and LEDs. The spectrometer people fight for
picometers of resolution over narrow bandwidths.

Resolution and signal to noise is everything in deep sky spectroscopy. You can do a lot of physics based on the observed shape of a known to be very narrow band emission (or absorption) line.
Much of the evidence for black holes comes from seeing temporal changes in the spectrum of a hot spot on the accretion disk and the jet hotspots.
You will need at least two sensors for that wavelength range the best back thinned CCDs can do 300nm-1100nm but you will need something else beyond that.
https://hamamatsu.magnet.fsu.edu/articles/quantumefficiency.html
Hyperspectral cameras will go out to longer wavelengths than you want but cannot do the UV comfortably (fall off around 400nm).
https://www.specim.com/technology/nir-hyperspectral-imaging/
A rough and ready method is that emitters also make useable detectors if you really don't care about resolution and just want a rough idea of whether the LEDs are working and at what approximate wavelength.
--
Martin Brown