Common IR Laser Modules have many common applications, and Safety protection is required when using infrared lasers to avoid injury accidents.
The following introduces common 808nm 1064nm 1550nm laser infrared laser band working materials and their applications:

1. Common Infrared Laser Source

The basic composition of a laser can be divided into three parts, pump source (provides energy, so that the working matter to realize the number of particles inversion); Working matter (with a suitable energy level structure, which can realize the reversal of the number of particles under the action of energy pumping, electrons from high energy levels down to release energy in the form of photons), resonant cavity.

Among them, the properties of the working substance determine exactly what wavelength of the laser can be emitted.

The mainstream of 808nm IR Laser Modules is a semiconductor laser. The band gap energy of semiconductors determines the wavelength of LD emission, so 808nm is one of the more common operating wavelengths. 808nm is also a kind of semiconductor laser that started earlier and studied more deeply. Its source region includes aluminum-containing materials (such as InAlGaAs) and aluminum-free materials (such as GaAsP). This type of laser has the advantages of low price, high efficiency, and long service life.

808nm DPSS Lasers 

Of course, now there is also a direct semiconductor laser as the pump source of other solid-state lasers because the use of semiconductor laser time is much higher than the lamp pump source, and because the semiconductor laser line width is very narrow, just coincides with the absorption bandwidth of solid-state laser, so the efficiency is very high.

1064nm is also a classical wavelength of solid-state laser. The working material is neodymium (Nd) doped YAG (Yttrium aluminum garnet, Y3Al5O12) crystal. Aluminum ions in YAG crystal can synergically act on Nd-doped cations to produce a suitable spatial structure and band structure. Nd cations are excited and in an excited state, resulting in radioactive transition and laser. Nd: YAG crystal has good stability and a long working life. Other solid-state lasers using neodymium-doped yttrium vanadate crystals as working materials are suitable for LD pumping with a laser wavelength of 1064nm.

1064nm DPSS Lasers

1550nm laser can also be realized by a semiconductor laser, commonly used semiconductor materials including InGaAsP, InGaAsN, and In GaAlAs.

2. Use & Application Field

The infrared band has many applications, such as optical communication, medical, biomedical imaging, laser processing, and so on. In the field of optical communication, for example, quartz fiber is now used in optical fiber communication. In order to make light carry information over long distances without loss, we have to consider which wavelengths of light are better transmitted in optical fiber. In the near-infrared band, the loss of common quartz fiber decreases with the increase of wavelength except for the impurity absorption peak. There are three wavelengths of "Windows" with low loss at 0.85μm, 1.31μm, and 1.55μm. The emission wavelength of the light source laser and the wavelength response of the photodiode of the photodetector must be consistent with the three wavelength Windows of the optical fiber. In particular, under laboratory conditions, the loss of 1.55μm has reached 0.1419db/km, which is close to the theoretical limit of quartz fiber loss.

Light in this band can well penetrate biological tissues and has some applications in photothermal therapy, etc. For example, Yue et al. used cyanine near-infrared dye IR780 to construct heparin-folic acid targeted modified nanoparticles, whose maximum absorption wavelength is about 780 nm and emission is located at 807 nm. The temperature increased from 23 ℃ to 42 ℃ after 2 min irradiation with laser (808 nm laser, 0.6 W/cm2 power density) at 10 mg/mL. Folate receptor positive MCF-7 tumor mice were administered at a dose of 1.4 mg/kg, and the tumor sites were irradiated with 808 nm laser for 5 min (0.8 W/cm2), and significant tumor shrinkage was observed in the following days.

There are other applications, such as infrared lidar, the current 905 nm band weather interference ability is weak, the penetration of rain and fog is insufficient, 1.5xμm laser radiation just in the 1.5~1.8μm atmospheric window, and low attenuation in the air. In addition, 905 nm is located in the dangerous band of human eyes, so the power must be limited to reduce the damage to human eyes, while 1550nm belongs to the safe band of human eyes, so the 1550nm band also has applications in lidar.

808nm IR Laser Modules

In short, on the one hand, because the laser technology of the relevant wavelength is relatively mature, the performance price ratio is higher, on the other hand, these wavelengths of light in different application scenarios show excellent performance, these reasons lead to the common laser of these bands.

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