velocimeter and rangefinder laser using a detection coherent

摘要

PCT No. PCT/FR97/01822 Sec. 371 Date Jul. 15, 1999 Sec. 102(e) Date Jul. 15, 1999 PCT Filed Oct. 13, 1997 PCT Pub. No. WO98/16844 PCT Pub. Date Apr. 23, 1998The invention relates to a velocity measurement device of the coherent detection type comprising: an active laser medium (10), an input mirror (M1) and a first output mirror (M3) defining, with the laser medium, a first resonant cavity of quality factor Qmax making it possible to emit a laser beam (4), a second output mirror (M2) defining, with the active laser medium (10) and the input mirror (M1), a second resonant cavity of quality factor Qmin (Qmax), making it possible to amplify a measuring signal from a target which has intercepted the laser beam (4) emitted with the aid of the first resonant cavity.