Some results of investigations of a sealed-off CuBr-Laser with the diameter of the active zone of 6 cm and the length of 100 cm (without screening diaphragms) are presented. After 300 hours of work the output power of the laser radiation falled off by about 25 % due to a decrease of the discharge tube windows. An experimental unit of CuBr-Laser capable of delivering 50 W mean output power has been build up. Specifications of this device are given in this paper.