The invention relates to an alkali-metal vapor cell, especially for an atomic clock, and to its manufacturing process. The alkali-metal vapor cell is able to be associated with a laser for emitting an external input laser beam and a photodetector for receiving an external output laser beam, and comprises a housing having an upstream optical window and a downstream optical window and forming an optical cavity filled with an alkali-metal vapor such as a caesium-comprising vapor, and micro-optical means arranged in the optical cavity and comprising an upstream optical reflector and a downstream optical reflector for reflecting the laser beam, which reflectors are inclined relative to each other, the upstream reflector being inclined relative to the plane (P) of the upstream window and to the axis of the input laser beam so that the external input laser beam passes through the upstream window in order to form an internal input laser beam, the latter being reflected by the upstream reflector and deviated towards t
