1310nm 1550nm Polarization Insensitive Isolator Manufacturers

Challenges faced by high-power continuous thulium-doped fiber lasers, Over the past two decades, the output power of continuous thulium-doped fiber lasers has increased dramatically. The output power of a single all-fiber oscillator has exceeded 500 W; the all-fiber MOPA structure has achieved an output power of kilowatts. However, there are still many problems restricting further improvements in power.

The fiber cut-off wavelength is to ensure that only one mode exists in the fiber. One of the main transmission characteristics of single-mode fiber is the cut-off wavelength, which is of great significance for fiber optic cable manufacturers and users of fiber optic cables to design and use fiber optic transmission systems.

In most cases the emitted light from the laser is polarized. Usually linearly polarized, that is, the electric field oscillates in a specific direction perpendicular to the direction of propagation of the laser beam. Some lasers (eg, fiber lasers) do not produce linearly polarized light, but other stable polarization states, which can be converted to linearly polarized light using a suitable combination of waveplates. In the case of broadband radiation, and the polarization state is wavelength dependent, the above method cannot be used.

Fluorescence imaging has been widely used in biomedical imaging and clinical intraoperative navigation. When fluorescence propagates in biological media, absorption attenuation and scattering disturbance will cause fluorescence energy loss and signal-to-noise ratio decrease, respectively. Generally speaking, the degree of absorption loss determines whether we can "see", and the number of scattered photons determines whether we can "see clearly". In addition, the autofluorescence of some biomolecules and signal light are collected by the imaging system and eventually become the background of the image. Therefore, for biofluorescence imaging, scientists are trying to find a perfect imaging window with low photon absorption and sufficient light scattering.