| 摘要 |
PURPOSE:To obtain a small-sized portable laser with high efficiency and variable wavelengths, by providing a light source for excitation whose maximum light power in a laser oscillation medium has a value larger than or equal to a specific threshold value. CONSTITUTION:The title laser is an optical fibre Raman laser provided with a laser oscillation medium constituted of a single mode optical fibre 9 added with rare earth elements, and mirrors 8 and 9 for laser resonance, and has a light source 6 for excitation whose maximum light output Pm in the laser oscillation medium is at least larger than or equal to Pc shown by the expression, where Pc is the threshold value of induction Raman scattering, A is the cross-sectional area in cm<2> of a core part of the optical fibre, G is the Raman gain in cm/w, alpha is the optical attenuation coefficient of the optical fibre in cm<-1>, and l is the fibre length in cm. Thereby, the induction Raman scattering effect is generated in the resonator system, and a small-sized, lightweight wavelength laser with high efficiency can be obtained. |
