Antireflection Coated Semiconductor Laser Amplifier

TL;DR

This paper introduces a simple, stable semiconductor laser amplifier with antireflection coating that operates without temperature stabilization, maintains high power stability, and allows arbitrary modulation and tuning.

Contribution

It demonstrates a novel laser amplifier design that eliminates the need for active temperature control and external cavities, simplifying the setup and enhancing stability.

Findings

Power stabilized to better than 10^-4

Operates without temperature stabilization

No lasing without seeding light

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.