| 摘要 |
PURPOSE:To output laser beams of a plurality of stable wavelengths using one absorption cell by locking oscillation wavelengths of semiconductor lasers to a plurality of absorption spectra in the absorption cell. CONSTITUTION:The output beams of semiconductor lasers 1 and 2 are combined in a beam splitter 4 and this combined beam is guided to an absorption cell 7. The absorption cell 7 is filled, for example, with substance which absorbs laser beams of a plurality of wavelengths, for example, caesium, rubidium, ammonium or water, and the light beam having passed the absorption cell 7 includes a plurality of absorption spectra. The laser beam having passed the absorption cell 7 is branched by a beam splitter 5, a part of it is used as the transmitted output beam and a part irradiates a light receiving element 9 generating an electrical signal depending on the received optical power. This signal is input respectively to lock-in amplifiers 11, 12. Moreover, it is applied to current control circuits 14, 15. Outputs of the current control circuits 14, 15 and outputs of oscillators 17, 18 are added in the adders 20, 21 and then applied to semiconductor lasers 1, 2. |
