As we all know, the laser particle size analyzer is an optical measuring instrument, and the laser and detector are important components and important optical components. At present, there are two types of lasers: one is a gas laser used in the 1960s --- He-Ne laser, and the other is a solid-state laser that has been developed since the 1980s and has continued to break through in technology.
With the development of the times and the advancement of technology, the optical components in the laser particle size analyzer will be continuously replaced by more advanced components with more advanced technical content. If you use solidified thinking to judge things, you must be biased. In other words, the things that everyone thought were good may have fallen far behind today, and technology has advanced, so we must follow up.
The following is a discussion of the types, developments, and characteristics of "lasers" in laser particle size analyzers, with a view to providing a little effective help to those who purchase laser particle size analyzers.
The advantages and disadvantages of semiconductor lasers compared to He-Ne lasers
Semiconductor laser, also known as laser diode (LD), is one of the latest achievements in the development of semiconductor physics in the 1980s. The advantages of conductor lasers are small size, light weight, high reliability, long service life, and low power consumption. In addition, semiconductor lasers use low voltage constant current power supply, low power failure rate, safe use, and low maintenance costs. Therefore, the application field is expanding. At present, the number of semiconductor lasers is the highest among all lasers, and other lasers that have been commonly used in some important application fields have been gradually replaced by semiconductor lasers. Its application fields include optical storage, laser printing, laser phototypesetting, laser ranging, barcode scanning, industrial detection, test and measurement instruments, laser display, medical instruments, military, security, field detection, construction leveling and marking instruments, Laser level and various marking positioning.
The disadvantage of semiconductor lasers in the past is that laser performance is greatly affected by temperature, and the beam divergence angle is large (generally between a few degrees and 20 degrees), so it is poor in directivity, monochromaticity and coherence. However, with the rapid development of science and technology, the performance of semiconductor lasers has reached a very high level, and the beam quality has also been greatly improved. The semiconductor optoelectronic technology with semiconductor laser as the core will make greater progress and play a greater role in the information society in the 21st century.
Among gas lasers, the most common is the He-Ne laser. It was made by Iranian physicist Jia Wan in the American Bell Labs in 1960. Due to the good directivity and monochromaticity of the beam emitted by the He-Ne laser, the beam has a small divergence angle and can work continuously, so this laser has a wide range of applications and is one of the most widely used lasers. Precision measurement, collimation and positioning.
The disadvantages of He-Ne lasers are their large size, high starting and operating voltages, complicated power supplies, and high maintenance costs.
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