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