Abstract
A compact second-order Stokes Brillouin fiber laser made of microstructured chalcogenide fiber is reported for the first time. This laser required very low pump power for Stokes conversion: 6 mW for first order lasing and only 30 mW for second order lasing with nonresonant pumping. We also show linewidth-narrowing as well as intensity noise reduction for both the 1st and 2nd order Stokes component when compared to that of the pump source.
Highlights
We show linewidth-narrowing as well as intensity noise reduction for both the 1st and 2nd order Stokes component when compared to that of the pump source
Brillouin fiber lasers (BFLs) have been attracting a lot of interest lately due to their very narrow linewidth [1] and low intensity [2] and frequency noise [3]. 1st order Stokes (S1) Brillouin ring lasers in silica fibers have been exploited for many applications ranging from microwave photonics applications [4] to gyroscopes [5]
This corresponds to a free spectral range (FSR) of 19.9 MHz, which is more than the measured ΔνB of 17.6 MHz, ensuring that only one single longitudinal mode is oscillating inside the cavity
Summary
Brillouin fiber lasers (BFLs) have been attracting a lot of interest lately due to their very narrow linewidth [1] and low intensity [2] and frequency noise [3]. 1st order Stokes (S1) Brillouin ring lasers in silica fibers have been exploited for many applications ranging from microwave photonics applications [4] to gyroscopes [5]. A relatively low laser threshold of 22 mW was obtained for nonresonant pumping in a BFL made of a 3-m long suspended-core As38Se62 chalcogenide fiber [9] This laser had very good intensity and frequency noise characteristics. The purpose of this communication is twofold: first to demonstrate the possibility of making compact BFLs operation on 2nd order Stokes component with a relatively low threshold power (section 3) and, second, to experimentally demonstrate the coherency and intensity noise performances of the S2 component generated in the cavity (sections 4 and 5)
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