On 31/07/2017 22:06, Jos Bergervoet wrote:
On 7/30/2017 10:57 AM, jacobnavia wrote:
Caltech has demonstrated a camera without lenses.

https://petapixel.com/2017/06/22/cal...camera-future/

Unfortunately the link (and the links referenced in it) do not
give much information. Interesting questions a

1) Sensitivity (signal to noise ratio) compared to a camera
that does have a lens (and e.g. a CCD as detector)?

My guess is rather limited. A bit more is online he

http://www.caltech.edu/news/ultra-th...t-lenses-78731

It is an 8x8 heterodyne OPA array - article behind a paywall

http://authors.library.caltech.edu/78652/
https://www.osapublishing.org/viewme...7-JW2A.9&seq=0

Academic users should have access though. Resolution stated as 0.75
degrees and beam steering of 8 degrees.

2) Does 'optical' mean infra-red or visible light? (IR may
be much more easy).
3) What is the bandwidth? A heterodyne system might be quite
limited here (which of course turns into an advantage if
you want a single spectral line..)

I don't immediately see this kind of information in related
articles either:
http://ieeexplore.ieee.org/search/searchresult.jsp?queryText=optical%20phased%20arra y

It might be handy for playing hunt the transient GRB optical component.
(though I suspect widefield survey cameras would win handsomely)

--
Regards,
Martin Brown