A compact, single-frequency, high-power, SBS-free, Yb-doped single-stage fiber amplifier

Balliu, Enkeleda; Engholm, Magnus; Nilsson, Hans‐Erik

doi:10.1117/12.2511049

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…The experimental setup of the fiber amplifier used in this work is shown in Figure 1. The seed laser is a low-noise, single-frequency, diode-pumped solid-state laser (DPSSL) (Cobolt, a Hübner Company, Stockholm, Sweden), described in detail elsewhere [5]. Light from the seed source was free-space-coupled with a coupling efficiency into a singlecladding polarization-maintaining (PM) fiber greater than 85%.…”

Section: Methodsmentioning

confidence: 99%

“…The former solution raises significant challenges that worsen with increasing compactness. The reason is that the combination of high power, small fiber core, and narrow spectral linewidth usually results in the onset of stimulated Brillouin scattering (SBS) [5] and, to a smaller extent, other undesirable power-scaling limitation effects occurring in the fiber, such as high thermal loading [6] and photodarkening [7]. SBS is generated by the non-linear interaction of the laser signal and the Stokes fields through an acoustic wave generated in the fiber through electrostriction [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Quasi-CW Pumping of a Single-Frequency Fiber Amplifier for Efficient SHG in PPLN Crystals with Reduced Thermal Load

et al. 2021

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Single-frequency lasers are essential for high-resolution spectroscopy and sensing applications as they combine high-frequency stability with low noise and high output power stability. For many of these applications, there is increasing interest in power-scaling single-frequency sources, both in the near-infrared and visible spectral range. We report the second-harmonic generation of 670 µJ at 532 nm of a single-frequency fiber amplifier signal operating in the quasi-continuous-wave mode in a 10-mm periodically poled Mg-doped lithium niobate (MgO:PPLN) crystal, while increasing compactness. To the best of our knowledge, this is the highest pulse energy generated in this crystal, which may find applications in the visible and UV such as remote Raman spectroscopy.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi-CW Pumping of a Single-Frequency Fiber Amplifier for Efficient SHG in PPLN Crystals with Reduced Thermal Load

et al. 2021

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“…Other techniques mitigate SBS by modifying the gain fiber. These modifications include utilizing a special gain fiber, for example with a large mode area (LMA) [9,10], a high Yb concentration [11], or a taper [12]. SBS has also been pushed back by applying a temperature [13,14] or strain gradient [15] to the gain fiber.…”

Section: Introductionmentioning

confidence: 99%

Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb3+

et al. 2021

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We report on a single-frequency fiber master oscillator power amplifier utilizing a polarization-maintaining step-index fiber with an Al/Ce/F core-glass composition doped with a very high Yb concentration (0.25 at.%). This design made it possible to use a very short fiber (~1 m) and to coil it in a tight radius (4 cm in the amplifier, while 2 cm gave similarly negligible bending loss) so that the packaged system is one of the most compact reported to date (~0.6 L). The use of a short fiber increased the threshold for stimulated Brillouin scattering well above 100 W while maintaining near-ideal beam quality. The fiber was pumped with a diode-pumped solid-state laser and cooled passively by spooling it on a grooved aluminum mandrel. The amplifier produced a strongly linearly polarized output at 1064 nm in the fundamental mode (M2 ≤ 1.2) with a 150 kHz linewidth and a power of 81.5 W for 107 W of launched pump power. No deleterious effects from the elevated thermal load were observed. The residual photodarkening loss resulting from the high Yb concentration, found to be small (~0.7 dB/m inferred at 1064 nm) with accelerated aging, reduced the output power by only ~20% after 150 h of operation.

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A compact, single-frequency, high-power, SBS-free, Yb-doped single-stage fiber amplifier

Cited by 2 publications

References 6 publications

Quasi-CW Pumping of a Single-Frequency Fiber Amplifier for Efficient SHG in PPLN Crystals with Reduced Thermal Load

Quasi-CW Pumping of a Single-Frequency Fiber Amplifier for Efficient SHG in PPLN Crystals with Reduced Thermal Load

Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb3+

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