Title: Antireflection Coated Semiconductor Laser Amplifier,
Abstract: This paper presents a laser amplifier based on an antireflection coated laser
diode. This laser amplifier operates without active temperature stabilisation
at any wavelength within its gain profile without restrictions on the injection
current. Using a active feedback from an external detector to the laser current
the power stabilized to better than $10^{-4}$, even after additional optical
elements such as an optical fiber and/or a polarization cleaner. This power can
also be modulated and tuned arbitrarily. In the absence of the seeding light,
the laser amplifier does not lase, thus resulting in an extremely simple setup,
which requires neither an external Fabry Perot cavity for monitoring the mode
purity nor a temperature stabilization.