The customer should select the suitable laser pointer

The customer should select the suitable laser pointer as per the cost.
Laser applications in the field of information, including laser information carrier, the sound, image, data and other information transmitted through the laser, or by a laser optical memory where information is stored in and printed by laser or the information displayed , and so on. This section describes the laser communications, laser display, storage and other areas of laser technology and applications, so that students understand all aspects of laser applications in these new ideas, new concepts, new technologies, new progress. Systematic review of the semester learning to help students summarize the focus of this course, difficulties and solutions to problems. Enable students to understand: in the light of scientific and technical knowledge of information systems, the laser in the information generation, acquisition and processing play an important role in both. laser pointer will not disturb others stargazing if it is not used continuously for a very long time.
Focus: the semi-classical radiation theory, linear and spectral broadening mechanisms, gain saturation, threshold conditions, the establishment of a continuous steady-state laser, the stability conditions of the cavity, the cavity of the Gaussian beam diffraction theory and analytic properties, the equivalent of focal cavity, mode-locked Q-and technical principles. Difficult: gain saturation, the cavity theory and Gaussian beam diffraction analysis features. The solution: teaching content for the important and difficult content, take priority review, read the textbook, by comparing the diversity of problem-solving approach. Focus error signal FE is usually measured as the bulk method, tracing error signal TE is usually measured by the speed of light with three. Some high power laser pointer should also be forbidden for a long time continuous use.
Servo-controlled laser beam tracing along the lines often trace forward, so that the vibration due to external lead to deviations from the pattern trace pattern traces back to center. Feed servo will respect the laser head moves through the tracking and control of the laser head regulator in tracking range. Feed circuit by the speed detector, feed equalizer and drives. Spindle spindle motor servo control to maintain speed, it often is in the linear speed, in order to read data from the disc, it is in a constant state density log data. It consists of sync detector, frequency control, phase detector and drives. Out of position limit switch position signal sent by the drive circuit, when out of the warehouse in place, and out of position by an internal microprocessor-controlled motor stops. laser pointer can support the normal display of various documents.