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Polarisation characteristics of a 12 fibre coupler under femtosecond pulsed and continuous wave illumination |
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| Authors: | Ling Fu Xiaosong Gan Damian Bird Min Gu |
| Affiliation: | aCentre for Micro-Photonics, School of Biophysical Sciences and Electrical Engineering, Swinburne University of Technology, P.O. Box 218, Hawthorn Vic. 3122, Australia;bLaboratory for Optical and Computational Instrumentation, University of Wisconsin-Madison, 1675 Observatory Drive, Madison, WI 53706, USA |
| Abstract: | We report on the experimental investigation carried out in the polarisation characteristics of femtosecond pulsed and continuous wave beams propagating through a 1×2 fibre coupler. It is demonstrated that the polarisation states of pulsed and continuous wave illumination over the broad wavelength range can be preserved in a conventional fused fibre coupler. Furthermore, the fibre coupler acts as a low-pass spectral filter in the visible wavelength range with a splitting ratio between 99.6/0.4 and 99.7/0.3. The result is of importance for fibre-optic second harmonic generation microscopy which requires the polarisation preservation to extract molecular organization of a sample. |
| Keywords: | Fibre coupler Polarisation preservation Second harmonic generation microscopy |
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