Professional Knowledge

  • A superradiance light source (also known as an ASE light source) is a superradiance-based broadband light source (white light source). (It is often mistakenly called a superluminescent light source, which is based on a different phenomenon called superfluorescence.) Generally, a superluminescent light source contains a laser gain medium that is excited to radiate light and then amplified to emit light.


  • Fiber polarization controllers create stress birefringence by wrapping the fiber around two or three circular disks, thereby forming independent waveplates that change the polarization state of light propagating in a single-mode fiber.


  • Femtosecond lasers are lasers that can emit optical pulses with a duration of less than 1 ps (ultrashort pulses), that is, in the femtosecond time domain (1 fs = 10−15 s). Therefore, such lasers are also classified as ultrafast lasers or ultrashort pulse lasers. For generating such short pulses, a technique called passive mode locking is often used.


  • Photodiodes are often used as photodetectors. Such devices contain a p-n junction and usually have an intrinsic layer between the n and p layers. Devices with intrinsic layers are called PIN-type photodiodes. The depletion layer or the intrinsic layer absorbs light and generates electron-hole pairs, which contribute to the photocurrent. Over a wide power range, the photocurrent is strictly proportional to the absorbed light intensity.


  • People utilized this ASE process to make broadband ASE light source which is essential for many different telecommunications, fiber sensing, fiber optic gyroscope, and test & measurement applications.


  • Master Oscillator Power-Amplifier. Compared with traditional solid and gas lasers, fiber lasers have the following advantages: high conversion efficiency (light-to-light conversion efficiency over 60%), low laser threshold; simple structure, working material is flexible medium, easy to use; high beam quality ( It is easy to approach the diffraction limit); the laser output has many spectral lines and a wide tuning range (455 ~ 3500nm); small size, light weight, good heat dissipation effect and long service life.