Erbium-doped mode-locked fiber laser is a laser that uses erbium-doped optical fiber as an active medium. Erbium-doped elements can absorb light energy within a specific wavelength range and emit laser photons of a specific wavelength. Mode-locked fiber laser is a laser that can produce extremely short pulses and is often used in scientific research, communication technology, and material processing.
Physicists at Harvard University have developed a powerful new on-chip laser that emits bright pulses in the mid-infrared spectrum—an elusive but extremely useful range of light that can be used to detect gases and enable new spectroscopic tools.
In today's era of rapid development of laser technology, solid-state lasers and fiber lasers, as the two major mainstream laser products, have each demonstrated their unique charm and advantages in many fields such as industrial production, scientific research, and military applications.
An electro-optic modulator (EOM) is a device that controls the power, phase or polarization of an optical signal through an electrical signal. Its core principle is based on the linear electro-optic effect (Pockels effect). This effect manifests itself in that the applied electric field is proportional to the refractive index change of the nonlinear crystal, thereby achieving effective control of the optical signal.
Direct Modulated Laser diode (DML) can be used to modulate optical power. In DML, the laser output power is adjusted by changing the pump current in the laser gain medium. The pump current is controlled by an electrical drive signal. This type of direct detection (DD) system typically uses On-Off Keying (OOK). In other words, the pump current of the DML is changed through binary signals.
According to the direction of scattered light propagation, currently common distributed fiber optic sensing technologies are divided into two categories: backscattering distributed fiber optic sensing technology and interference distributed fiber optic sensing technology.
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