| Popis: |
A probe for providing medical guidance information comprises a hollow needle (1) defining an optical path within the needle for a collimated laser beam to illuminate a sample (2), the optical path further providing a return path for light scattered from the sample (2) due to inelastic scattering such as Raman scattering or fluorescence. The probe further comprises an optical input (3) for providing light of an input wavelength from a laser source to the optical path, an optical output (6) for outputting light from the return path for spectral analysis, and a wavelength selective beam splitter (8) which directs light at the input wavelength from the optical input (3) to the optical path and directs light from the return path at wavelengths other than the input wavelengths to the optical output (6). |
