A semiconductor laser, such as surface emitting laser, is disclosed. A particular system is put into use and data collected to quantify various quality of service factors. The additional cycle oil is obtained by vacuum separation of the CSO. This method comprises determining real time need for access to the device and prioritizing access using a rate monotonic scheduling. An end portion of one of the first and second members has one or more protruded portions, while an end portion of the other member has one or more slits configured to receive the one or more protruded portions. After the second locking member is unscrewed and loosened, by means of rotating the turning section, the relative radial positions between the take-up cam and the lower driving shaft is drivingly adjustable.