Kilowatt-level stimulated-Brillouin-scattering-threshold monolithic transform-limited 100 ns pulsed fiber laser at 1530 nm

Abstract

We demonstrate a high-stimulated-Brillouin-scattering-threshold monolithic pulsed fiber laser in a master oscillator power amplifier configuration that can operate over the C band. In the power amplifier stage, we used a newly developed single-mode, polarization maintaining, and highly Er/Yb codoped phosphate fiber with a core diameter of 25 microm. A single-frequency actively Q-switched fiber laser was used to generate pulses in the hundreds of nanoseconds at 1530 nm. We have achieved peak power of 1.2 kW for 105 ns pulses at a repetition rate of 8 kHz, corresponding to a pulse energy of 0.126 mJ, with transform-limited linewidth and diffraction-limited beam quality.

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

“…In 2010 the same research group, by using 15 cm of a new active fiber with larger single-mode core (25 µm, core NA = 0.0395) for the power amplifier section, was able to demonstrate a peak power of 1.2 kW for 105 ns pulses at 1530 nm, equivalent to a pulse energy of 0.126 mJ, with transform-limited linewidth and diffraction limited beam quality [91].…”

High-energy 100-ns single-frequency all-fiber laser at 1064 nm

“…Highly rare-earth-doped multicomponent fiber has been greatly developed recently, in which sufficient laser gain can be provided with a short active fiber length [18,19]. In 2010, Shi et al achieved a pulse energy of 0.126 mJ for 105 ns pulses at a repetition rate of 8 kHz, where only two pieces of 15-cm long heavily Er/Yb co-doped phosphate fibers were employed in power amplification stages [20]. With highly Tm-doped germanate glass fiber boosting power and pulse energy in final amplifier, an average power of 16 W and pulse energy around 1 mJ were obtained by the same group in 2012 [21].…”

Observation of Brillouin gain spectrum in optical fibers in telecommunication band: Effect of pump wavelength

“…The typical wavelengths of laser diodes at the telecommunication wavelength are 1510, 1530, and 1550 nm [14,15,16,17]. To date, no reports have been provided as to which wavelength is the most suitable for Brillouin observation, because the Brillouin gain spectrum (BGS) is known not to be largely dependent on the wavelength of the pump light in this range [6].…”