Fiber coupled diode laser

E5.2.7.1 Fiber coupled diode laser


  • Principle of diode laser.
  • Beam collimation.
  • "Fiber pig tail".
  • Output power.
  • Beam properties.
  • Spatial beam distribution.
Principle of operation

Diode lasers differ from most classical lasers in two distinct ways: First they do not posses an inherently defined wavelength. Instead of two defined energy levels, the lasing transition occurs between two energy bands. Further, the pn junction defines the lasing volume, instead of the resonator in a classical laser. The experiment introduces the laser diode and investigates the variation of the emitted laser wavelength versus temperature and current.

The diode laser is mounted inside the slot-in module and provides an optical fibre output which terminates on the front panel of the slot-in module. By means of a fibre patch cable, it is connected to a rotational stage (RS) which allows the rotation perpendicular to the beam propagation to measure the spatial distribution of the emitted laser light. Via a second fibre patch cable, the detected light is guided to the photodetector module or to the optical spectrum analyser. The integrated frequency modulator is used to study the modulation capabilities of the laser diode with respect to its characteristic curve. Furthermore, it is used to modulate the laser diode with a rectangular signal in order to eliminate disturbing environmental light enhancing the sensitivity of the angle resolved intensity distribution of the used fibre patch cable.
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