Ms. Merilyn S. Ferreira Profile

Merilyn S. Ferreira

Student at Instituto de Pesquisa Energéticas e Nucleares

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Proceedings Article | 21 February 2020 Presentation + Paper

Nd:YLF/KGW intracavity Raman laser in DBMC configuration emitting at 1147 and 1163 nm in TEM00

Merilyn Ferreira, Helen Pask, Niklaus Wetter

Proceedings Volume 11259, 112590K (2020) https://doi.org/10.1117/12.2545092

KEYWORDS: Raman spectroscopy, Crystals, Laser crystals, Mirrors, Neodymium lasers, Diodes, Semiconductor lasers, Coating, Output couplers

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An Nd:YLF/KGW intracavity Raman laser in DBMC (double-beam-mode-controlling) configuration has been investigated in this work. The fundamental wavelength laser was generated using a Nd:YLF crystal pumped in DBMC configuration generating an emission wavelength of 1053 nm in σ-polarization. A VBG (volume-Bragg-grating) equipped diode emitting at 797 nm was used as pump source. The KGW crystal has two strong Raman lines, 768 cm^-1 and 901 cm^-1, generating two Raman wavelengths at 1147 nm and 1163 nm, respectively. The DBMC technique allows to produce TEM₀₀ stable output in a side-pumped configuration with no requirement to introduce any additional mode selection technique, thus achieving high efficiency for fundamental TEM₀₀ operation. The high power density of the fundamental laser combined with intracavity Stokes conversion produces an efficient Raman laser. Allying both techniques, the Nd:YLF in DBMC configuration and the intracavity Raman generation, it was possible to generate an output power at 1163 nm of 3.2 W corresponding to a diode-to-Raman conversion efficiency of 8% with slope efficiency of 8.8 %. For the emission at 1147 nm, 3.5 W of output power was achieved with a diode-to-Raman conversion efficiency of 11% and slope efficiency of 9%. The beam quality was M² =1.9 and 1.1 in the horizontal and vertical direction, respectively. This is, to our knowledge, the first report of a side-pumped Nd:YLF/KGW intracavity Raman laser in DBMC configuration.

Proceedings Article | 16 February 2018 Presentation + Paper

Intracavity diode-side-pumped Raman laser at 1147 nm and 1163 nm

Merilyn Ferreira, Helen Pask, Niklaus Wetter

Proceedings Volume 10518, 1051816 (2018) https://doi.org/10.1117/12.2290596

KEYWORDS: Crystals, Laser crystals, Semiconductor lasers, Diodes, Polarization, Neodymium lasers, Mirrors, Laser applications, Raman scattering

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Wavelengths in the yellow-orange range are of significant interest due to their application potential in the medical and biomedical areas, as well as for applications in laser displays and in remote sensing. These wavelengths can be obtained by frequency-doubling or sum-frequency generation of lasers with near-IR emission like VCSELS, fiber lasers, and OPOs. However, all these alternatives have several limitations that justify the development of alternative methods. As a possible solution for these limitations, a configuration of an intracavity converted Raman laser may be developed to obtain two wavelengths, 1163 nm, and 1147 nm, with high efficiency and good beam quality. This paper presents a configuration of a side-pumped intracavity converted Raman laser to achieve these objectives. A Nd:YLiF₄ crystal was used as fundamental wavelength gain crystal. The side-pumped configuration guarantees practicability and cost reduction while allowing good efficiency and fundamental mode laser beam. The intracavity conversion configuration allows high fundamental wavelength power at the Stokes crystal in order to facilitate the obtention of the Stokes wavelengths and enables optimization of its efficiency. As a result an output power at 1163 nm of 3.8 W in the multimode regime was obtained, corresponding to a pump to Stokes efficiency of 9.6%. The TEM₀₀ diode to Stokes efficiency was 7%. For the emission at 1147 nm, 1.5W of output power with a diode to Stokes efficiency of 3.7% was achieved. The side-pumped Nd:YLF/KGW intracavity Raman laser configuration is reported for the first time, to our knowledge.

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