Narrow-linewidth tunable laser working at 633 nm suitable for industrial interferometry
2015
Semiconductor lasers found a foothold in many fields of human activities, mainly thanks to its small size, low cost and
high energy efficiency. Recent methods for accurate distance measurement in industrial practice use principles of laser
interferometry, which are based on lasers operating in the visible spectrum. When the laser beam is visible the alignment
of the industrial interferometer makes the measuring process easier. Traditional lasers for these purposes for many
decades - HeNe gas laser - have superb coherence properties but small tunable range. On the other hand laser diodes are
very useful lasers but only if the active layer of the semiconductor equips with a passive selective element that will
increase the quality of their own resonator and also prevents the structure of its higher longitudinal modes.
The main aim of the work is a design of the laser source based on a new commercial available laser diode with
Distributed Bragg Reflector structure, butterfly package and fibre coupled output. The ultra-low noise injection current
source, stable temperature controller and supply electronic equipment were developed with us and experimentally tested
with this laser for the best performances required of the industrial interferometry field. The work also performs a setup
for frequency noise properties investigation with an unbalanced fibre based Mach-Zehnder interferometer and 10 m long
fibre spool inserted in the reference arm. The work presents the way to developing the narrow-linewidth operation the
DBR laser with the wide tunable range up to more than 1 nm of the operation wavelength at the same time. Both
capabilities predetermine this complex setup for the industrial interferometry application as they are the long distance
surveying or absolute scale interferometry.
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