The signals of the hyperfine ⁸⁵Rb[5P_{3/2 (F′=2,3,4)→5S1/2 (F＝3)] transition lines in a diode laser induced retrofluorescence spectrum at the interface between glass and Rb vapor were experimentally identified and investigated.The glass-vapor interface was considered as two distinct regions,a wavelength-thickness vapor layer joined to the surface and a more remote vapor region.The first region was analyzed as a spectral filter that annihilates the absorbed photons and the second one as a rich spectral light source.The experimental setup is described.A Rb reference cell (T=293 K) was used.A part of the laser beam scanned the 5S1/2 (F＝3)→5P3/2 (F′＝2,3,4) transition.The Doppler broadened absorption profile (FWHM=510 MHz) was determined.The laser detuning of the profile-center relative to the F=3→F′＝4 transition was about 70 MHz.Another laser beam was directed to the entrance cell window.The resonant retrofluorescence S^ob(ν^L) as a function of laser detuning for a cell temperature -130 ℃ and laser power 0.4 mW was obtained.We can extract the experimental signal sn exP(ν^L) originating from the near-field region by subtracting signal S^T(ν^L) originating from the far-field region from the total experiment signal S^ob(ν^L).A fit of the normalized profile of the data corresponding to the spectral band centered on the F′＝4→F＝3 hyperfine transition line was obtained by using a Lorentzian distribution function with ΓRF＝50 MHz full width at half-maximum.The role played by different relaxation processes contributing to the retrofluorescent atomic linewidth was characterized.The authors summed up the corresponding spectral broadening and obtained the relation ΓRF＝Γn＋Γcoll＋ΓnR,where ΓcoLL is the resonance collisional broadening of the hyperfine line,and ΓnR is an additional broadening induced by the nonradiative energy-transfer phenomena of the excited atoms near the cell window surface.To evaluate ΓcoLL,we used the relation ΓcoLL＝γRb-Rb n,where γRb-Rb is line broadening parameter,and N is Rb atom number density.The effective nonradiative relaxation rate of the 5P3/2 (F′＝4) energy hyperfine level was estimated to be AnR F′＝4→F＝3＝2.4×10⁸ s^-1.The value of A nR seems relatively large compared to the spontaneous emission rate A(5P3/2→5P1/2)＝1.4×10^7s-1.}