| 摘要 |
An optical supercontinuum radiation source (10) for generating a broad optical supercontinuum from pump radiation having a wavelength in the range 900nm to 1200nm. The source comprises a microstructured optical fibre (20) and a pump laser (30) adapted to generate pump radiation in the range 900nm to 1200nm and to pump the microstructured optical fibre with the pump radiation. The fibre comprises a core region, which comprises a first refractive index and supports a plurality of modes at said pump wavelength, and a cladding region, which surrounds the core region and comprises an effective refractive index such that the fibre has a delta, ”, value of greater than 0.03. The cladding region comprises at least two air holes extending along the length of fibre. The ratio of the diameter of the air holes to their pitch is greater than 0.6. The fibre comprises a zero dispersion wavelength within ±200nm of the pump wavelength. |
