The function of the polarization beam splitting prism is to separate the horizontal polarization and vertical polarization of a beam of light. The P-polarized light passes through completely, while the S-polarized light is reflected at a 45 degree angle, and the exit direction is at a 90 degree angle to the P light. The transmittance ratio of P light to S light is greater than 1000, while ensuring that the transmittance of P light is above 90%. It has the characteristics of low stress, high extinction ratio, good imaging quality, and small beam deflection angle.
Polarizing beam splitter prism is made by cementing a pair of high-precision right-angle prisms. The following describes the application of polarization beam splitting prisms in laser interferometers.
Because laser has excellent time coherence, its coherence distance can reach several kilometers, so since the advent of laser, the design of laser interferometer lens with laser as light source has been People are paying attention, its application range continues to expand, laser interferometer technology is also constantly developing, and various forms of laser interferometer have appeared.
Although there are various forms of laser interferometers, in principle, they can be attributed to two basic types: single-frequency laser interferometers and heterodyne laser interferometers.
The laser interferometer usually used for length measurement uses the Machelson interferometer system. Figure 1 is a schematic diagram of the principle of a single-frequency laser interferometer. The beam splitter BS divides the laser into 2 beams. One beam is directed to the fixed mirror R, and the other is directed to the moving mirror M. When the moving mirror M moves, the reflected light from R and M merges at O u200bu200bto cause interference. Due to the additional phase shift nature of the metal film of the beam splitter, the photoelectric The phase difference of the signals received by the laser lenses 1 and D2 of the detector D is 90°, which is used to distinguish the direction of the counter.
Certain pollutants and lens damage cannot be removed by cleaning, especially the film burnt caused by metal splash and dirt. The only way to restore good performance is It is to replace the lens.
The correct installation method:
During the installation process, if the method is not correct, the lens will be contaminated. Therefore, the operating procedures mentioned earlier must be followed. If a large number of lenses need to be installed and removed, it is necessary to design a fixture to complete the task. The specific fixture can reduce the number of contact with the lens, thereby reducing the risk of lens contamination or damage.
In addition, if the lens is not installed correctly, the laser system of the high-power laser lens group will not work normally, or even be damaged. All carbon dioxide laser lenses should be installed in one direction. Therefore, the user should confirm the correct orientation of the lens. For example, the high reflection surface of the output mirror should be inside the cavity, and the high transmission surface should be outside the cavity. If it is reversed, the laser will not produce laser light or produce low-energy laser light. The convex surface of the final focusing lens should be inside the cavity, and the second surface of the lens head should be either concave or flat, and this side should be working. If it is reversed, the focus will become larger and the working distance will change. In the cutting application, the cutting seam becomes larger and the cutting speed becomes slower.
reflector is the third commonly used lens, and its installation is also very critical. Of course, it is easy to distinguish the reflective surface for the mirror. Obviously, the coated side faces the laser.
Generally speaking, manufacturers will mark the edges to help distinguish the surface. Generally this kind of mark is an arrow, and the arrow faces one side. Every lens manufacturer has a system for lens marking. Generally speaking, for mirrors and output mirrors, the arrow points to the high reverse side. For lenses, the arrow points to a concave or flat surface. Sometimes, the lens label will remind the meaning of the mark.
Prevention and protection bring rewards
When the lens is properly cleaned and operated, then its service life and performance It will undoubtedly improve significantly. Taking some preventive and maintenance measures in this article will ensure that the CO2 laser tube works longer and performs better!
Shenzhen Wangxinsheng Technology Co., Ltd. is a professional factory that develops and produces high-power laser (laser) lenses, dichroic lenses, laser mirrors, and beam splitters. It is especially good at high-power laser fiber cutting machines, The protective lens, focusing lens and collimating lens of the laser welding machine, the power range is 500W-8000W. The factory is located next to the Guanlan Golf Club, Baoan District, Shenzhen, with an experienced Ru0026D and production team. The equipment includes Taiwan Maijun polishing machine, Korean Era Seiko edging machine, Japanese new Coron coating machine, glass cutting machine, ultrasonic, American LAMBDA950 spectrophotometer (measuring range 175nm-3500nm), interferometer, eccentric meter, etc. With complete production technology and professional testing capabilities, rigorous technical processes and strict quality management system guarantee the excellence of the quality of optical lenses. http://www.wxsjp.com/