A homodyne interferometer which exploits a multiple reflection arrangement between two quasi parallel mirrors to deliver a multiplication factor is presented. The relative displacement of the two mirrors causes a more than 100-fold increment of the optical path, which is measured by the optoelectronic circuitry. This leads to a proportional reduction of the errors associated with the subdivision of the optical fringes, with the effect of fringe nonlinearities, and with the opto-electronic noise. In particular the reduction of the electronic noise limit to the level of 20 fm Hz^(−1/2) has been demonstrated. The exact formula of the gain has been calculated and confirmed experimentally.
A homodyne Michelson interferometer with sub-picometer resolution / Pisani, Marco. - In: MEASUREMENT SCIENCE & TECHNOLOGY. - ISSN 0957-0233. - 20:(2009), pp. 084008-084013.
A homodyne Michelson interferometer with sub-picometer resolution
PISANI, MARCO
2009
Abstract
A homodyne interferometer which exploits a multiple reflection arrangement between two quasi parallel mirrors to deliver a multiplication factor is presented. The relative displacement of the two mirrors causes a more than 100-fold increment of the optical path, which is measured by the optoelectronic circuitry. This leads to a proportional reduction of the errors associated with the subdivision of the optical fringes, with the effect of fringe nonlinearities, and with the opto-electronic noise. In particular the reduction of the electronic noise limit to the level of 20 fm Hz^(−1/2) has been demonstrated. The exact formula of the gain has been calculated and confirmed experimentally.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
