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Analysis of Helium-Neon Lasers and Semiconductor Lasers

Analysis of Helium-Neon Lasers and Semiconductor Lasers

The helium-neon laser boasts slightly better output power and laser frequency stability, as well as superior monochromaticity, coherence, and directionality of its beam. It also features a long device lifespan, a simple structure, and a relatively low price. The semiconductor laser, also known as the laser diode, is one of the most recent breakthroughs in semiconductor physics developed in the 1980s. Semiconductor lasers have several advantages: small size, light weight, high reliability, long service life, low power consumption, and operation on low-voltage DC power supplies. Of course, nothing in the world is absolutely perfect—both helium-neon lasers and semiconductor lasers have their own drawbacks. To put it simply, the helium-neon laser does indeed offer excellent beam quality; however, its beam diameter is too narrow, typically no more than 0.9 mm.

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96-channel simultaneous acquisition technology

96-channel simultaneous acquisition technology

Each particle size analyzer is equipped with a detector that has multiple independent channels to detect the scattered light from the sample. The scattered light signals are converted into electrical signals by the detectors and then analyzed by software to generate a particle size distribution spectrum. With advances in technology, in recent years, particle size analyzers have increasingly more optical channels—many models now feature as many as over a hundred channels. As for other brands' claims about the motherboard's sampling rate being so many times per second, each channel is sampled sequentially: only after the first channel has been fully sampled does the instrument move on to the second channel. Although it takes only a short time to complete the sampling of all over a hundred channels, the total sampling time remains quite long when compared to the constantly changing nature of the sample itself. As a result, the signals collected in this manner do not represent an instantaneous spectrum across all channels, and the resulting particle size distribution is therefore not highly accurate. NKT’s 96-channel simultaneous acquisition motherboard breaks through the limitation of sequential sampling. After the software issues the sampling command, all channels instantly freeze and collect data simultaneously—just like taking a photograph—to ensure temporal consistency of the spectra across all channels, thus delivering more accurate data.

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