downconverting optical frequencies...
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From: Tim Wescott on 19 Jul 2010 12:53 On 07/18/2010 06:37 PM, steveu wrote: >> hello forum, >> >> I know that is it is possible to downconvert high frequencies to lower >> frequencies.... >> >> what is the highest frequency we can downconvert and why? How is it done? >> >> ( I don't think the issue exists in the reverse direction: we can > convert >> any low frequency signal to a high frequency one) > > One crude downconvert with real world applications is to shine two lasers > on a silicon photosensor. I think most types of silicon sensor work OK for > this. The modes of a laser are typically hundreds of megahertz apart. If > you use gratings to pick out a single mode from each of the lasers, you > will see the difference frequency in the output of the sensor. Is it real world as in "guys with white coats and big dreams", or is it a commercial success? And by "commercial success" I mean does it make money for the people who buy it, not just the people who sell it. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
From: Clay on 19 Jul 2010 14:24
On Jul 19, 12:51 pm, Tim Wescott <t...(a)seemywebsite.com> wrote: > On 07/19/2010 07:08 AM, Clay wrote: > > > > > > > On Jul 18, 9:41 am, "fisico32"<marcoscipioni1(a)n_o_s_p_a_m.gmail.com> > > wrote: > >> hello forum, > > >> I know that is it is possible to downconvert high frequencies to lower > >> frequencies.... > > >> what is the highest frequency we can downconvert and why? How is it done? > > >> ( I don't think the issue exists in the reverse direction: we can convert > >> any low frequency signal to a high frequency one) > > >> thanks > >> fisico32 > > > How high do you want to go? Check out both the Compton and Inverse > > Compton scattering. http://en.wikipedia.org/wiki/Compton_scattering > > > You can upconvert E-M radiation to make x-ray or gamma beams by > > upconverting uv light by ramming them head on into a electron stream > > (inverse compton effect). > > Does that result in light that is coherent to the source? I.e. is the > amplitude of the light wave multiplied by some power function, or is the > mechanism more like cyclotron radiation? > > -- > > Tim Wescott > Wescott Design Serviceshttp://www.wescottdesign.com > > Do you need to implement control loops in software? > "Applied Control Theory for Embedded Systems" was written for you. > See details athttp://www.wescottdesign.com/actfes/actfes.html- Hide quoted text - > > - Show quoted text - This does not have to be coherent. You have the original energy spreads of both the E-M radiation and the electron sources. Synchrotron radiation works differently. Clay |