Wavelength-swept Yb-fiber master-oscillator-power-amplifier with 70nm rapid tuning range

Abstract

A continuous-wave all-polarization maintaining ytterbium-doped fiber master oscillator power amplifier, with a tuning range of 70 nm addressable at tuning rates of up to 20 nm/ms, is described. Up to 10 W of linearly polarized output was generated with an amplified spontaneous emission content of less than 0.2% throughout the tuning range.

Wavelength-swept optical parametric oscillator for broadband mid-infrared spectroscopy

“…The OPO was pumped by a cw all polarisation-maintaining ytterbium-doped fibre master-oscillator power-amplifier (MOPA) [13]. Electronically controlled tuning was implemented using an AOTF in the master oscillator's cavity, allowing manual adjustment of the wavelength or automated sweeping at up to 20 nm/ms.…”

“…1, and exhibited fluctuations of up to 20% over tuning ranges of a few wavenumbers, both these variations were reproducible from sweep to sweep and thus fully cancelled by the normalisation procedure described. Mode-beating noise from the pump laser, resulting in fluctuations at 38 MHz and its harmonics [13], was electronically filtered by limiting the detector bandwidth. As the spectra and power variation data were not acquired simultaneously, normalisation was carried out on the average of 64 wavelength sweeps.…”

“…To test this approach for calibration of our frequency-swept spectra, prominent spectral features at opposite ends of the frequency sweep were used as references to determine two absolute idler frequencies. The corresponding pump frequencies were then determined from the Sellmeier equation [16], allowing an absolute pump frequency scale to be interpolated due to the pump tuning being linear and continuous within the resolution of these measurements [13]. The Sellmeier equation was then used to derive an absolute idler frequency scale across the entire spectrum from the pump frequencies.…”

High power, continuous-wave ytterbium-doped fiber laser tunable from 976 to 1120 nm

“…Finally, Yb-doped fibers have theoretical emission bandwidth ranging from 976 nm to 1200 nm [4]. However, most of the tunable Yb-doped fiber lasers exploits the quasi-four-level system between 1030 and 1100 nm [5,6]. Recently, high-power emission around 976 nm has been reported resolving the problem of efficient laser operation of the Yb three-level system [7].…”

87-W, 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb:YLF amplifier

“…Usually, Yb-doped fiber lasers exploit the quasi-four-level system between 1030 and 1100 nm [21]. For wavelength below 1030 nm, Yb-fiber operates as a three-level system, making amplification of sub-ps pulses at 1018 nm difficult due to the low emission cross section and high absorption cross section at shorter wavelength.…”