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According to the latest report from IMARC Group, the global fiber laser market will grow at a CAGR of around 8% in 2021-2026. Factors such as rapid industrialization and increasing adoption of advanced technologies to automate various manufacturing processes are among the key factors driving the growth of the fiber laser technology market. In addition to this, fiber lasers are gaining popularity in the healthcare industry due to the growing prevalence of chronic diseases. They are used in settings such as dentistry, photodynamic therapy, and biomedical sensing in the mid-infrared spectrum. Furthermore, with the growing demand for electric vehicles (EVs), the application of fiber lasers in internal combustion engines (ICEs) is expected to increase.

Fiber Optical Amplifier is a kind of optical amplifier using optical fiber as gain medium. Typically, the gain medium is fiber doped with rare earth ions, such as erbium (EDFA, Erbium-Doped Fiber Amplifier), neodymium, ytterbium (YDFA), praseodymium and thulium. These active dopants are pumped (provided with energy) by light from a laser, such as a fiber-coupled diode laser; in most cases, the pump light and the amplified signal light travel simultaneously in the fiber core.

The 980/1550nm wavelength division multiplexer (WDM) is a key component of erbium-doped fiber lasers and amplifiers. 980/1550nm WDM is mostly made of single-mode fiber (SMF) and made by winding fusion tapering method. With the development of optical fiber communication and sensing technology and the successful development of polarization-maintaining fibers, PMF circulators and isolators, more and more systems use PMF and polarization-maintaining devices to package the polarization characteristics of the optical transmission in the subsystem.

Single-mode fiber-coupled laser diode Package type: There are two commonly used packages for this type of semiconductor laser tube, a "butterfly" package, which integrates a TEC temperature-controlled cooler and a thermistor. Single-mode fiber-coupled semiconductor laser tubes can usually reach an output power of several hundred mW to 1.5 W. One type is a "coaxial" package, which is commonly used in laser tubes that do not require TEC temperature control. Coaxial packages also have TEC.

The near-infrared spectrum is mainly generated when the molecular vibration transitions from the ground state to a high energy level due to the non-resonant nature of the molecular vibration. What is recorded is mainly the frequency doubling and combined frequency absorption of the vibration of the hydrogen-containing group X-H (X=C, N, O). . Different groups (such as methyl, methylene, benzene rings, etc.) or the same group have obvious differences in the near-infrared absorption wavelength and intensity in different chemical environments.