Hybrid master oscillator power amplifier high-power narrow-linewidth nanosecond laser source at 257 nm

Abstract

We report on a high-power narrow-linewidth pulsed laser source emitting at a wavelength of 257 nm. The system is based on a master oscillator power amplifier architecture, with Yb-doped fiber preamplifiers, a Yb:YAG single crystal fiber power amplifier used to overcome the Brillouin limitation in glass fiber and nonlinear frequency conversion stages. This particularly versatile architecture allows the generation of Fourier transform-limited 15 ns pulses at 1030 nm with 22 W of average power and a diffraction-limited beam (M(2)<1.1). At a repetition rate of 30 kHz, 106 μJ UV pulses are generated corresponding to an average power of 3.2 W.

Development of pulsed fiber lasers for long-range remote sensing

“…24 Potentially open-ended power scaling can, however, be pursued via beam combining techniques such as wavelength multiplexing and coherent phasing.…”

High-power ns-pulse fiber laser sources for remote sensors

“…Another approach is to use the fiber-based MOPA for seeding a single or series of bulk solid-state amplifiers (e.g. Yb-or Nd-doped YAG rods) [46], which can safely operate above the SF critical power, in principle, as the SF length exceeds the amplifier length.…”

Single crystal fiber for laser sources

“…For the amplification of a narrow linewidth signal, we use a seed source made of a DFB laser diode amplified in four consecutive fiber amplifiers [20]. In order to have a high SBS threshold in our fiber amplifiers, we use a photonic crystal fiber with a 40 µm core diameter for the last amplification stage.…”