How we can collect two wave(light) ?

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Discussion Overview

The discussion revolves around the methods for collecting and measuring two light waves of different wavelengths. Participants explore various optical devices and techniques that could be employed in this context.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant suggests using lenses and mirrors to redirect and concentrate light, referencing common optical devices like glasses and microscopes.
  • Another participant seeks clarification on collecting two waves of different wavelengths specifically.
  • A further reply discusses the use of photodetectors, optical filters, single-mode fibers, and diffraction gratings to isolate and measure different wavelengths, providing an example with 550 nm and 800 nm light.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the clarity of the initial question or the specific methods to be employed, indicating that multiple competing views remain regarding the best approach to the problem.

Contextual Notes

The discussion lacks detailed definitions of terms and specific assumptions regarding the setup for collecting the light waves, which may affect the proposed methods.

PhyHunter
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How we can collect two wave(light)?
Thanks
 
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The question is not quite clear... But lenses and mirrors come to mind. A lens or a angled mirror redirects light. You can be clever and use lenses and mirrors to concentrate light together in a volume, area or point. Of course we are familiar with these types of devices, glasses, microscopes, prisims, etc.
 
I want to say how can collect two waves which different wavelength
 
Still not enough information, but I'll take a stab, photodetectors generally have quite a wide range of responsivity and will produce a measurable voltage when lots of different wavelengths are incident (e.g. 500 - 900 nm). You can work around this using optical filters, signle-mode fibers, or diffraction gratings, which isolate narrowband light from a broadband source. If you have e.g. 550 and 800 nm light, split it, send one through a 550 nm filter and the other through a 800 nm filter, then send each to its own photodetector with known responsivity in the given ranges.

From the two output voltages you can deduce from a single incoming light source what intensity is at 550 nm and what intensity is at 800 nm.
 

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