Light source apparatus
The present invention relates to a light source apparatus that has a base structure capable of generating SC light and further having a structure that enables the shaping of the spectral waveform of the SC light, power adjustment of the SC light, or adjustment of the frequency of repetition of the pulse train that contains the SC light. For example, a light source apparatus that enables shaping of spectral waveforms comprises a seed light source that emits seed light which is a pulse train or continuous light; an optical fiber that generates SC light from the seed light, and spectrum shaping means for completely or partially changing the spectral waveform of the SC light. The shaping of the spectral waveform changes the maximum power of the seed light by changing the optical coupling efficiency of the seed light source and optical fiber, for example, thereby suitably deforms the spectrum of the SC light.
1. A light source apparatus, comprising:
a seed light source emitting an optical pulse train as seed light;
an optical fiber optically connected to said seed light source, said optical fiber generating supercontinuum light the spectral width of which is enlarged in response to the input of seed light from said seed light source; and
spectrum shaping means, disposed in said seed light source or between said seed light source and said optical fiber, for partially or completely deforming the spectral shape of the supercontinuum light generated in said optical fiber, by changing a maximum power of each pulse contained in the optical pulse train to be introduced into said optical fiber,
wherein said spectrum shaping means is disposed between said seed light source and said optical fiber, and includes an optical axis adjusting section changing an optical coupling efficiency between said seed light source and said optical fiber, the optical coupling efficiency depending on an optical axis shift between said seed light source and said optical fiber.
2. A light source apparatus according to claim 1 , wherein said optical axis adjusting section includes a condensing lens and an optical adjustment section, and
wherein said optical adjustment section includes a first drive section that displaces the condensing lens and a second drive section that displaces the optical entrance end of the optical fiber.