Changes and Advances in Laser Types in Laser Particle Size Analyzers

　　As we all know, the laser particle size analyzer is an optical measuring instrument , in which the laser and the detector are important components and important optical elements. Currently, there are two types of lasers: one is the gas laser used in the 1960s, the helium-neon laser, and the other is the solid laser that has been developed since the 1980s and has made continuous technological breakthroughs.

　　With the development of the times and the advancement of technology, the optical components in the laser particle size analyzer will be constantly replaced by more advanced and promising components. If we judge things with a fixed mindset, we will definitely be biased. In other words, what everyone thought was good back then may be far behind today. As technology advances, our understanding must keep up, right?

　　The following is a discussion of the types, developments, and features of "lasers" in laser particle size analyzers, in the hope of providing some effective help to those who are purchasing laser particle size analyzers. The information is quoted from the "Dandong Better Particle Size Analyzer Website".

　　Advantages and disadvantages of semiconductor lasers compared to He-Ne lasers

　　Semiconductor lasers, also known as laser diodes (LD), are 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 used ranks first among all lasers. Other lasers that were commonly used in some important application fields have gradually been replaced by semiconductor lasers. Its application fields include optical storage, laser printing, laser typesetting, 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 rulers and various marking positioning, etc.

　　In the past, the disadvantages of semiconductor lasers were that the laser performance was greatly affected by temperature, and the divergence angle of the beam was large (generally between a few degrees and 20 degrees), so the directionality, monochromaticity and coherence were poor. 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. Semiconductor optoelectronic technology with semiconductor lasers as the core will make greater progress and play a greater role in the information society of the 21st century.

　　Among gas lasers, the most common is the helium-neon laser. It was created by Iranian physicist Javan at Bell Laboratories in the United States in 1960. Since the beam emitted by the helium-neon laser has good directionality and monochromaticity, a small beam divergence angle, and can work continuously, this type of laser has a wide range of applications and is one of the lasers with the most applications. It is mainly used in the precision measurement and alignment of holographic photography.

　　The disadvantages of He-Ne lasers are their large size, high starting and operating voltages, complex power supplies, and high maintenance costs.