the invention relates to a laser device , comprising a laser material brought into a simmer mode . a controllable source of additional energy supplies energy to the laser material , such that in only a desired part of the laser material a lasing threshold is exceeded , and a laser beam is emitted from only a desired part of the laser surface . this device makes possible to provide a laser beam in just the desired part of the laser , which allows a flexible and localized output . the invention further relates to a hair - removing device comprising a laser device according to the invention and further comprising an optical system for focusing the laser beam pulses on a focal spot and for positioning the focal spot in a target position , wherein the optical system comprises a movable lens or a plurality of individually addressable lenses .