SL-Series stabilized He-Ne-lasers employ a patented two-mode stabilization technique providing high frequency stability in conjunction with rapid warm-up. The stabilized He-Ne-laser is installed in a compact cylindrical case. For power supply only a single 13.5 V-AC adapter is necessary. The output beam is linearly polarized. Two different models either with one single mode (Modell SL 02/1) or with two polarized modes (Modell SL 02/2) are available. An internal thread at their beam exits may be used for installing mechanical shutters or various types of optical components. Especially fiber couplers directly installed on the laser head operate stable and nearly free of realignment. Couplers with pigtails mating to monomode or multimode fibers are optionally available.