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faculty: "FNWI" and publication year: "1990"
| Authors||R.J.C. Spreeuw, R. Centeno Neelen, N.J. van Druten, E.R. Eliel, J.P. Woerdman|
|Title||Mode coupling in a He-Ne ringlaser with backscattering|
|Journal||Physical review: A: Atomic, molecular, and optical physics|
|Faculty||Faculty of Science|
|Institute/dept.||FNWI: Van der Waals-Zeeman Institute (WZI)|
|Keywords||Mode coupling; He-Ne ringlaser|
|Abstract||An alternative approach is proposed to discuss mode coupling in bidirectional ring lasers that is induced by backscattering. It is shown that various features can be simply discussed in terms of the mode structure of the corresponding passive ring cavity. The nature of the backscattering is found to play a crucial role in determining the normal-mode structure. For instance, we show theoretically that, for a rotating ring laser (gyro), the characteristics of frequency locking are already present in the passive-mode structure if the mode coupling has a dissipative nature, i.e., if the backscattering originates in localized losses. If, on the other hand, the backscattering has a conservative nature, i.e., originates in steps of the refractive index, a frequency splitting is found in the passive-mode structure, making so-called oscillatory instability possible. Experimental observations are reported to support this point of view. The recently reported pi -phase jumps in He-Ne ring lasers are shown to fit naturally into this scheme. These jumps can be described as transitions between the normal modes of the passive ring cavity.|
|Note||(c)2001 American Physical Society|
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