The degree of polarization of F center luminescence, P S , induced by a uniaxial stress has been investigated in KF, KCl, KBr, KI, RbF, RbCl, RbBr, and CsBr crystals. Polarizations associated with \(\varGamma_{\alpha}\) mode coupling, \(P_{S}(\varGamma_{\alpha})\), were observed under the relevant experimental geometries. The observation of \(P_{S}(\varGamma_{5})\) and its temperature dependence in the range from 2 K to 77 K were first presented. This temperature dependence was found to be contrasted to that of \(P_{S}(\varGamma_{3})\) which was also precisely observed in this work. Three sorts of linear stress coefficients, that was \(P_{S}(\varGamma_{\alpha})\) per unit stress applied, were tabulated for α=3, 5, and a combination of 3 and 5. A vibronic parameter of \(\varGamma_{5}^{+}\)-mode phonons was estimated to be small compared with that of \(\varGamma_{3}^{+}\)-mode.