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Physics
Classical Physics
Optics
Light coupling from optical fiber to glass?
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[QUOTE="Hyperfine, post: 6833035, member: 731603"] Thank you for those details. I must say that I am not a fan of the proposed capillary and its coupling to fiber optics. That reflects my biases based on my laboratory experience in a high-resolution LASER lab. Just so you know that. I would approach the problem by separating the mounting of the detector wire and the method of delivery of light to the sample. Regarding the light, I would urge that you consider simply focusing the light onto the sample by means of one or more lenses. More on that below. I would then mount the electrode separately allowing precise positioning of that electrode as well as facile replacement if needed. Back to the light. I do not know the properties of the LED you are using--divergence for example, so I cannot make specific recommendations. In general however, I think you should be able to devise a series of lenses that will allow you to tightly focus the light as needed. Some general comments on how i would approach that. Assuming you have sufficient space, I would use a standard optical rail to mount the components. Each individual component would be mounted on a stable mounting system that can be precisely manipulated in all three dimensions. With the proper lenses, that should give you the ability to deliver a tight focus spot on your sample as desired. It also allows easy placement of other optical components in the beam path. Potentially useful ones include a simple shutter to block the beam if needed (better than turning the LED off), or optical filters (neutral density perhaps). A further comment regarding the manipulation of a hard to see light beam. At your wavelength, high quality business cards are a must have. The paper must be highly bleached white paper. Why you ask; because that paper fluoresces with good efficiency making it quite easy to see your beam spot. [/QUOTE]
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Forums
Physics
Classical Physics
Optics
Light coupling from optical fiber to glass?
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