I built a optical fiber probe (one emission surrounded by six for collection, no filters) and I wish to capture Raman spectra.
The lasers I have available to me are at 976nm but they do have a lot of power (>4W), however, I don't seem to be able to measure any Raman signal.
What might I be doing wrong?
4 W is enough for cutting, but too much for Raman spectroscopy, isnt it?
The lasers can go up to 4W but we can have them operating in the 800mW range, which, from my understanding, should be close to the ideal power for this wavelength.
The question is about density of the excitation power. What is the sample, lenses? The large power sometimes is not the better....
Currently, there are no lenses, we are working on including them, however, the spot size is already quite small, < 0.5mm in diameter.
For detection there are many factors: the geometry for retrieving the signal, the sensitivity of the detector, the resolution of the spectrometer, and how well you can filter out the Raman signal from the high level scattered laser signal. All this aspects need optimization, and any one of them may be giving you problems,
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