Light drag in a ring laser: An improved determination of the drag coefficient

Abstract

The light drag in a rotating fused-silica disk inserted in a He-Ne ring laser was measured at X = 633 nm and found to be a, = 0.5424 with an rms error (lcr) of +2X10 4, including the known error sources. This constitutes a tenfold improvement in accuracy over a previous result. %'hile the given error margin does not include the value given by the Lorentz drag in a linear arrangement, aLp = 0.54182 the measured difference of 2cr is deemed too small to claim a discrepancy.

Ring-laser tests of fundamental physics and geophysics

“…Incidentally, the effect of the Earth's rotation on small to medium ring-laser systems has been routine in the aviation gyro industry for 15 years, although largely undocumented (as unremarkable); it has been noted as a bias in a variety of ring-laser or ring-interferometer set-ups (Aronowitz 1971, Bilger and Stowell 1977, Spielman et al 1990, Bretenaker et al 1993a.…”

Light Aberration in Optical Anisotropic Single-Axis Medium

“…In 1977 H. Bilger and W. Stawell conducted the experiment, wherein light propagated in the rotating optical disc of the annular laser interferometer. [8] Anisotropy of the electromagnetic radiation velocity space under transversal light entrainment in the rotating optical disc was investigated by V.O. Gladyshev, P.S.…”

Earlier studies of the Sagnac effect

“…¤ÂÓÓÇÔÔ [20] ÔÑÔÕÑâÎÂ Ä àÍÔÒÇÓË-ÏÇÐÕÂÎßÐÑÏ ÑÒÓÇAEÇÎÇÐËË ÄËAE ÍÑà××ËÙËÇÐÕ ÖÄÎÇÚÇÐËâ ¶ÓÇÐÇÎâ ë ¶ËÊÑ: AEÎâ ÍÎÂÔÔËÚÇÔÍÑÅÑ ÔÎÖÚÂâ ÑÐ ËÏÇÇÕ ÄËAE a 1 À 1an 2 , Ô ÖÚÇÕÑÏ ÒÑÒÓÂÄÍË ¤.¡. ÑÓÇÐÙ a 1 À 1an 2 À lan dna dl (ÅAEÇ n ì ÍÑà××ËÙËÇÐÕ ÒÓÇ-ÎÑÏÎÇÐËâ ÔÓÇAEÞ, l ì AEÎËРÄÑÎÐÞ ÔÄÇÕÂ).´ÂÍËÏ ÑÃÓÂÊÑÏ, ÄÑÒÓÑÔ ÔÕÑâÎ Ñà àÍÔÒÇÓËÏÇÐÕÂÎßÐÑÌ ÒÓÑÄÇÓÍÇ ÕÇÑÓËË ÑÕÐÑÔËÕÇÎßÐÑÔÕË.°ÕÏÇÕËÏ, ÚÕÑ ËÐÕÇÓÇÔ Í àÍÔÒÇÓËÏÇÐ-ÕÂÎßÐÑÏÖ ÑÒÓÇAEÇÎÇÐËá ÄËAE ÍÑà××ËÙËÇÐÕ ÖÄÎÇÚÇÐËâ à×ËÓ ¶ÓÇÐÇÎâ ë ¶ËÊÑ ÐÇ ÑÔÎÂÃÇÄÂÇÕ Ë ÔÇÌÚÂÔ (ÔÏ., ÐÂÒÓË-ÏÇÓ, [40,41] …”