Abstract
We present a frequency-shifted feedback (FSF) laser based on a tapered amplifier. The laser operates as a coherent broadband source with up to 370 GHz spectral width and 2.3 \muμs coherence time. If the FSF laser is seeded by a continuous-wave laser a frequency comb spanning the output spectrum appears in addition to the broadband emission. The laser has an output power of 280 mW and a center wavelength of 780 nm. The ease and flexibility of use of tapered amplifiers makes our FSF laser attractive for a wide range of applications, especially in metrology.
Highlights
An frequency-shifted feedback (FSF) laser consists of a pumped gain medium inside a cavity that contains a frequency shifting element such as an acousto-optic modulator (AOM)
The vertically polarized reflection off the polarizing beam splitter (PBS) serves as the output port of the FSF laser which is sent to the diagnostic tools via optical fiber
We have demonstrated an FSF ring laser based on a tapered amplifier
Summary
An FSF laser consists of a pumped gain medium inside a cavity that contains a frequency shifting element such as an acousto-optic modulator (AOM). Spontaneously emitted photons from the gain medium are frequency shifted and amplified, resulting in a coherent modeless broadband emission spectrum. Their coherent broadband emission is used for optical domain ranging, as in [5], where a distance of 18.5 km was measured with parts-per-million accuracy. In this article we demonstrate an FSF laser that uses a tapered amplifier (TA) as gain medium. The relatively cheap devices are available at a wide range of emission wavelengths Our work leverages these advantages, making FSF lasers accessible to more researchers, thereby widening the range of applications of these light sources. We present first our experimental setup and the spectral properties of the FSF laser
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