I need to shift light from a certain wavelength/frequency to another, lower, level. For example, green light down to yellow or orange.

wikipedia spectral colors

I want to reduce the energy level of the transmitted light, for example, by a wavelength between 75 and 100 nanometers (roughly 50 to 120 THz).

How can this be done via medium changes? I.e., altering glass (adding a material or element or heating/cooling, etc.) or using some medium that could drop the energy level of the incoming light down to a lower frequency or by applying a magnetic/electromagnetic field?

  • $\begingroup$ You might consider a Raman shifter. $\endgroup$ – Bert Barrois Sep 7 at 15:20
  • $\begingroup$ Raman shifters are interesting, but are they not very lossy? This particular use case requires a lossless or near-lossless method of retaining the "image" (input array) if possible... $\endgroup$ – ylluminate Sep 7 at 16:31
  • $\begingroup$ A phosphor might do the trick .... easy to convert blue to green, yellow or red. $\endgroup$ – PhysicsDave Sep 8 at 2:18
  • $\begingroup$ Hmm. Interesting, can you elaborate on this further @PhysicsDave? I'm not sure of flexibility - would it be possible to drop down from violet and perhaps even high range UV with phosphor? $\endgroup$ – ylluminate Sep 8 at 2:59
  • $\begingroup$ All white leds use phosphor to convert a portion of blue or uv light to green, yellow red in a broad spectrum. The blue plus the emitted colours make the white, you can wiki phosphor or led ..... $\endgroup$ – PhysicsDave Sep 8 at 11:35

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