1057 Optoelectronics

Laser diode is a semiconductor device using the stimulated emission of radiation, which is basically a laser with a diode-shaped quantum well as an active medium. It has a very simple structure. The laser diode can generate a light beam with single wavelength and very small divergence angle, and the output power can reach a few watts. Laser diode has the advantage of high efficiency, low cost, small size, long life and easy control. It is a common laser product. A laser diode is often integrated with an optical component or optical system to form a laser diode module.

1057 refers to the application field and operating principle of laser diode. Generally, it can be divided into two categories: continuous laser diode and pulse laser diode. The former is used in communication, laser printing, fiber laser, optical fiber, laser measurement and other fields, while the latter is mainly used in medical equipment, spectroscopy, laser 3D printing, laser rangefinder and other fields. Laser diode modules are most commonly used in applications such as laser fusion cutting and welding, laser marking and production line automation. Some of the advanced laser diode modules are used in medical applications.

The working principle of laser diode is to inject carriers into a quantum well, which helps the electrons and holes recombine and releases energy which is equivalent to the band gap. When the electron and hole recombination rate is higher than the spontaneous radiation rate, the device begins to lase. The injection current is applied to the active region, which can generate a population inversion with the help of the real electric field present in the device. When the injection current is increased more than the threshold current, the device amplifies its own light with the help of the continuous current injection, thus realizes the optical amplification.

In addition, the output of laser diode can also be modulated with different frequency, which is the basis of laser communication.The waveform of the output beam can be changed by controlling the current. It can also be used as a master oscillator to boost the power more than thousands of times. Laser diode module combines the laser diode device with optical system, including collimator lens, reflector, filter and other optical components to improve the output beam of laser diode.

In summary, 1057 is the field and working principle of laser diode and laser diode module. Laser diode has the advantages of high efficiency, low cost, small size, long life and simple control. Laser diode module is more commonly used in production line automation, laser marking and laser cutting application. Moreover, the output of laser diode can also be modulated, which has certain application in communication.