| 摘要 |
<p>A laser wavemeter (10, 20, 30) determines the unknown wavelength of a laser (11a) by measuring the phase difference between two orthogonally polarized beams derived from the laser. The orthogonally polarized beams propagate along two optical paths of different lengths as defined, for example, by a polarizing beam splitter (14, 24, 36a, 36b, 36c) or a stepped reflector (26) with a defined step height (26a, 26b). An in situ reference laser (11b) of known wavelength allows calculation and monitoring of the path difference between the two optical paths.</p> |
