The General Non-uniformity Of Excimer 5mw Laser Pointer Is Better

As long as the use of laser projection imaging of high-energy laser for laser lithography, while the use of imaging techniques is usually divided into four categories: access to imaging, laser projection imaging, 100mW laser pointer direct imaging, step and repeat imaging. Principle of operation of these technologies and features vary, each has its own advantages and disadvantages. By comparison of four imaging systems can be seen, in considering the large area of exposure, high yield, high-precision, low-cost and other factors, "Laser projection imaging technology" is simple, imaging effect, the higher cost of the method . Then using hexagonal seamless scanning technology, is to form a hexagonal spot the whole distribution platform for high-speed scanning movement, PCB substrate is scanned and the image line by line, the entire substrate can be anywhere on the amount of exposure is very uniform . The testing center of green laser pointer has the advanced inspecting instrument. 
The general direction of the long side with flat-top distribution (Top-Hat), the other is up nearly Gaussian distribution, or nearly flat distribution in between. Although the excimer laser light field distribution uniformity is already higher than the general non-uniformity of excimer 5mW laser pointer is better, but because of excimer lasers in the large volume, high voltage, high-pressure state operation, easily lead to uneven discharge gain, and if the proportion of working gas changes, changes in the output pulse energy at the same time, the intensity of the beam cross-section distribution of considerable change occurred, resulting in the output light intensity distribution fluctuated considerably, from the practical application there is a gap. The new manufacture base of 200mW Laser Pointer draws a lot of attention. It describes the energy distribution of the spot within the overall uniformity of results. The ideal beam with flat-top shape (Figure 4.14 curve A), the best uniformity, flat-topped factor is 1; Gaussian beam is less 0.5; excimer laser is generally flat factor of 0.6 ~ 0.7. The actual value of the beam flat factors closer to 1, indicating the beam uniformity as possible. In practice, uniform cross-section is not fixed in one location, but there is a range, in this context, the requirements of uniformity can be achieved. The Production process of green laser pointer needs to be under the supervision of the director.
Flat factor - uniform cross-section curve to reflect a more comprehensive position of the dynamic changes. These indicators from different angles and beam uniformity requirements described, the processing window describes the processing task itself, the beam uniformity requirements; energy scores to answer the specific requirements of uniformity processing window that is under the energy efficiency issues; flat factor describes the energy distribution throughout the beam uniformity within the scope of the problem [15]. Laser projection imaging of printed circuit board production process the most effective way, the traditional imaging techniques gradually revealed poor accuracy and resolution, and low rates of production and product defects, but the Blue Laser Pointer light source instead of ordinary light of the new imaging technology . Laser has its good parallel, narrow linewidth and high-resolution unique advantages such as the use of PCB exposure to the production machine to produce high density, high-quality PCB, to meet the increasing miniaturization of electronic products, light of the needs. The customer asks to add one testing item of appearance inspection of green laser pointer.