Working principle of 48AT-0 and attenuation
Working principle of 48AT-0
The collimated laser beam is constricted by a precision ball transported by a scaled micrometer screw. The subsequent single-mode fiber coupling is used as a mode filter.
This mechanically stable attenuation method allows the precise and reproducible setting of the laser power output over a wide range (typically 1.5 to > 60 dB). Unlike a power regulation by modulation of the laser current, the wavelength and polarization status of the laser beam are preserved.
A reproducible power attenuation is only assured for singlemode fibers that have a Gaussian intensity profile.
Attenuation and relative power output depending on the micrometer position of the precision ball.