Research on Coherent Anti-Stokes Raman Scattering Spectroscopy Excited by Tapered Fiber
The feasibility of using tapered fiber instead of focusing objective to generate coherent Raman scat-tering signal is verified by numerical simulation and experimental measurement.The transmission characteristics of ultra-short pulse in tapered fiber are analyzed by numerical calculation and experimental measurement.It is proved that the tapered fiber with a length of 5 cm cone region can effectively ensure the time-domain and spectral charac-teristics of ultra-short pulse transmission in the tapered fiber,and the power attenuation is small,and the maximum insertion loss in the wavelength range of 850～1 100 nm does not exceed 1.05 dB,the average value is 0.84 dB.Then,the Raman formant of cyclohexane at 2 853 cm-1 is successfully detected by tapered fiber,which proves the feasibility of using tapered fiber to excite coherent Raman spectra.The use of tapered fiber excitation coherent Ra-man spectroscopy is flexible and convenient in signal excitation,which gets rid of the constraints of traditional space optics,and provides a new way for the development of coherent anti-Stokes Raman scattering(CARS)systems in the field of endoscopic imaging and minimally invasive detection.
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