A semiconductor module is a device that produces stimulated emission with a certain semiconductor material as a working substance. It is part of a semiconductor laser.
Module Features:
The working principle of the semiconductor module is the excitation method, which uses the semiconductor material (that is, the use of electrons) to transition between the energy bands to emit light, and uses the cleavage surface of the semiconductor crystal to form two parallel mirror surfaces as mirrors to form a resonant cavity, so that the light oscillates, feeds back, The radiation that produces the light is amplified, and the laser is output.
The advantages of semiconductor module lasers are small size, light weight, reliable operation, low power consumption and high efficiency.
Module power:
The power of semiconductor module lasers varies from a few watts to several kilowatts. Laser marking machines commonly use 50W, 75W, and 100W semiconductor modules. For end-pumped semiconductor modules, a few watts are generally used. The highest is generally 20W.
Common parameters:
Common parameters of semiconductor lasers can be divided into: wavelength, threshold current Ith, operating current Iop, vertical divergence angle θ⊥, horizontal divergence angle θ∥, monitoring current Im.
(1) Wavelength: that is, the working wavelength of the laser tube. At present, the wavelengths of laser tubes that can be used as photoelectric switches are 635nm, 650nm, 670nm, and laser diodes are 690nm, 780nm, 810nm, 860nm, 980nm, etc.
(2) Threshold current Ith: that is, the current that the laser tube starts to generate laser oscillation. For general low-power laser tubes, its value is about tens of milliamps, and the threshold current of laser tubes with strained multiple quantum well structures can be as low as 10mA the following.
(3) Working current Iop: that is, the driving current when the laser tube reaches the rated output power. This value is more important for designing and debugging the laser driving circuit.
(4) Vertical divergence angle θ⊥: the angle at which the light-emitting band of the laser diode opens in the direction perpendicular to the PN junction, generally around 15°~40°.
(5) Horizontal divergence angle θ∥: the angle at which the light-emitting band of the laser diode opens in the direction parallel to the PN junction, generally around 6?~10?.
(6) Monitoring current Im: that is, the current flowing on the PIN tube when the laser tube is at rated output power.
Semiconductor device:
Laser diodes have been widely used in low-power optoelectronic devices such as optical disc drives on computers, print heads in laser printers, barcode scanners, laser ranging, laser medical treatment, optical communications, and laser pointers, and are used in stage lighting, laser surgery. It has also been used in high-power equipment such as laser welding and laser weapons.
