Although the optical lenses in the CO2 laser system are consumables, we always hope to use as little as possible in order to extend the life of the laser and reduce the cost of use.
During the replacement process, the placement, inspection, and installation of the lens must be careful to prevent damage and contamination of the lens. After a new lens is installed, it should be cleaned regularly. The process is fairly simple. Correct operation will extend the life of the lens and reduce costs. On the contrary, it will reduce the service life.
When the laser is working, it is inevitable that the optical components in the laser will contact suspended objects. When the laser tube cuts, welds, and heats the material, the working surface will release a large amount of gas and spatter, which will cause damage to the lens. When contaminants fall on the surface of the lens, it will absorb energy from the laser beam, causing a thermal lens effect. If the lens lens design has not formed thermal stress, the operator can disassemble it and clean it. Of course, some method should be used to avoid damage to the lens and further contamination.
During the installation and cleaning of the lens, any sticky matter, even nail marks or oil drops, will increase the absorption rate of the lens and reduce the service life. Therefore, the following precautions must be taken.
(1) Never install the lens with your bare fingers. Wear finger cots or rubber gloves. Do not use sharp instruments to avoid scratches on the surface of the lens.
(3) When taking the lens, do not touch the film, but hold the edge of the lens.
The lens should be placed in a dry and tidy place for testing and cleaning. There should be several layers of cleaning tissues or wipes on the surface of a good workbench, and several sheets of lens cleaning tissues. The user should avoid talking above the lens, and keep food, beverages and other contaminants in the latent laser lens away from the working environment.
Fluorescence filters are widely used in the field of biochemical analysis. Fluorescence filters generally include three combinations, namely excitation filters, dichroic mirrors and emission filters.
Exciting Filter (ExcitingFilter, ExciterFilter, ExcitationFilter): In a fluorescence microscope, only the wavelength of excitation fluorescence can pass through the filter. There are also direct use of laser as excitation light.
Dichroic mirror (DichroicMirror, DichroicBeamsplitter, DichromaticBeamsplitter): also known as dichroic filter or dichroic mirror. It is placed at an angle of 45° to the optical path of the microscope. This filter reflects one color light (excitation light) high-power laser lens group and transmits another color light (emission light), the reflectance of excitation light is greater than 90%, and the transmittance of emitted light is greater than 90%. The opaque part of the spectrum is reflected rather than absorbed. The color of the filter under the transmitted light and the reflected light is complementary to each other, so it is also called a dichroic filter.
Emitting Filter (EmittingFilter, EmissionFilter, BarrierFilter, Emitter): Select and transmit the fluorescence emitted by the sample, and the light in other ranges is cut off. The wavelength of the emitted light is longer than the wavelength of the excitation light. You can choose a band-pass filter or a long-wave pass filter as the emission filter.
White light has perfect color characteristics, but it will damage the vision of adapting to dark light. It takes a certain amount of time to re-adapt after a certain light source is extinguished.
Red mirror light is usually used for night vision. The red light does not cause your pupils to shrink too much and the eyes do not need to re-adapt to the darkness once the red light goes out. Red is also usually used as a 'safe' color in monochrome photo processing because it will not damage the film being processed. Yellow light has some of the advantages of red light and white light. Another advantage of yellow light is that when you read, it reduces the reflection and dazzling light that causes eye fatigue due to long reading.
Green light can also be used for night vision, and green light is especially suitable for reading maps or charts at night. It is not so easy to be spotted by night vision equipment, so it is easy to be spotted by the human eye. The brightness of green light is lower than that of red light.
Blue light can be used to read maps at night and is generally favored by military personnel because blue light increases the level of contrast. It can also be used as a background work light color in theaters and performances.
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