Abstract:The results of development of two versions of the intracavity laser refractometry in reflection (ILRR) are reviewed in this paper. The ILRR method is based on the use of the properties of two-mode lasers with broken cavity and allows the precise refractive investigations of turbid media to be fulfilled in real time. The ILRR applications are primarily planed to biological liquids study. The results of blood refractometry are offered.A fragment of the sitall monobloc three-mirror laser

In view of its potential for the intracavity laser refractometry, He-Ne laser with two orthogonally polarized modes at wavelength of 1.15 µ was studied. The amplitude and frequency characteristics of this laser were investigated theoretically and experimentally. It has been shown that stable two-mode lasing may be implemented for any split between modes upon applying the transverse magnetic field.