We all know that 405nm laser diode is widely used in daily life, so do you know where it is mainly used? Let's take a look at it together.

optical storage device

The most famous is the Blu-ray Disc player.

The reason why Blu-ray can store more data is because the wavelength of 405nm is short, the light spot can be made smaller, and more dense pits can be read.

Now, although the CD is not on fire, there is still a market for 405nm in scanning equipment.

Spectral analysis, fluorescence excitation

In the laboratory, 405nm laser is a "universal excitation source" because many materials, proteins and fluorescent dyes will respond around here.

Typical uses: medical analyzer, fluorescence microscope, fluorescence detection, material analysis (semiconductor, mineral)

Photon energy of 405nm is high, but it is not as expensive as deep ultraviolet, so it is especially liked by scientific research equipment.

Micro-machining and marking

Some micro-machining with less material requirements will be done with 405nm: PCB surface marking, plastic surface coding, two-dimensional code of electronic components, and simple engraving.

Life science and medical instruments

Because 405nm has moderate penetration in biological tissues and can excite some specific dyes, it often appears in flow cytometry, blood analyzer, optical imaging equipment and fluorescence quantitative PCR front-end excitation.

These usually require high stability of laser.

Optical positioning and spot positioning

405nm light spot is small and has high visibility, and it is sometimes used for the positioning of precision equipment, the alignment of detection cameras and the spot marking of industrial instruments.

Compared with red light, its light spot is more "sharp" and more popular in some high-precision positioning.

The above is the main purpose of 405nm laser diode. I hope you will have a new understanding after reading it.