Mode frequency pulling in He–Ne lasers

Abstract

Articles you may be interested inSelf-heterodyne mixing method of two inter-mode beat frequencies for frequency stabilization of a three-mode He-Ne laser AIP Advances 2, 022170 (2012); 10.1063/1.4733344 Design and test of miniaturized glass ceramics HeNe laser with frequency and intensity simultaneously stabilized Rev. Sci. Instrum. 81, 105116 (2010); 10.1063/1.3499247 Study on single-transverse mode output of high-power flat He-Ne laser Rev. Sci. Instrum. 80, 053112 (2009); 10.1063/1.3142460 Frequency stabilization of an internal mirror He-Ne laser by digital control Rev. Sci. Instrum. 73, 221 (2002); 10.1063/1.1419215Distance measurement method using the two intermode beat frequencies of a three-longitudinal mode He-Ne laser Rev.In this experiment, the frequency separation between two longitudinal He-Ne laser modes is studied. A description is given of the physics that causes a change in the frequency separation when the modes are observed at various positions in the gain profile. The frequency separation is measured with a fast photodetector in combination with a counter as a function of the mode intensity ratio. The intensity ratio is monitored with a scanning Fabry-Perot interferometer. For a scan of the two modes through the gain profile, a frequency separation change of ϳ30 kHz was observed.

Intermodal beat frequency stability in a polarization stabilized HeNe laser with an optical switch

“…We think that both effects can be explained by the facts shown by Anishenko [10] that the intermodal frequency has natural fluctuations and that this frequency depends on laser modes intensities [11]. The modes intensities, as shown by Yoshino [12], on the other hand, depend on the anisotropy of the multilayer mirrors used in the tested laser tube.…”

A visible extended cavity diode laser for the undergraduate laboratory

“…This is typical for such lasers. 21,22 In Fig. 10͑b͒ we can see the resultant mode beating of the He-Ne laser and the ECDL.…”

Frequency difference stabilization in Y-shaped cavity dual-frequency laser with the aid of precision passive control

“…When the gain coefficient is not zero, the refractive index is a function of frequency. 24 Due to the dispersion of the gain material, the longitudinal mode frequency of an ordinary He-Ne laser is closer to the center frequency than that of the passive cavity. In the case of the Y-shaped cavity laser, the S-light and P-light share the gain region.…”