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Brightness enhancement of high power quasi-continuous-wave beams is investigated in a diamond Raman laser as a function of the input beam quality. Up to 389 W of 1240 nm output is generated with a 78.2% linear slope efficiency and 52.5% overall conversation efficiency. For an M2 = 3.3 pump, the output beam quality factor of M2 = 1.08 was obtained, yielding a brightness enhancement factor of 3.7. Higher...
Ever since the laser's invention, there has been great interest in increasing beam output power without detriment to its coherence. Despite great advances having been obtained through the use of a diverse range of approaches, steady‐state beam powers above ten kilowatts remain a significant challenge for solid‐state lasers due to the heightened impact of detrimental nonlinear effects such as thermal...
Researchers in Australia report a novel approach to laser brightness scaling based on beam combination in a diamond Raman amplifier. Efficient power transfer to a Stokes input is demonstrated using a three pump beam arrangement. An analysis is also presented revealing that the concept may be applicable to continuous beam generation at kilowatt power levels and orders‐of‐magnitude higher when using...
Defect induced stress birefringence in CVD grown diamond has been investigated using Metripol and Mueller polarimetry. Optical rotation was observed, up to a maximum of 280 through an 8 mm long diamond sample, in addition to linear birefringence.
Factors affecting the output efficiency of an external cavity quasi-cw KYW Raman laser were investigated. We show that a major limit to efficiency, in addition to thermal effects, results from a cascading effect involving a secondary Raman mode of KYW at 87 cm−1.
Diamond is a highly attractive laser material due to its exceptional optical and thermal properties. Its high thermal conductivity, low thermal expansion and wide transparency are especially suitable for high-average power laser applications. In comparison to more mature Raman crystalline materials, diamond has demonstrated the highest recorded output powers for both continuous wave [1] and pulsed...
We report an investigation into a 8.2 W diamond Raman laser with conversion efficiency of 27% pumped by a cw Nd:YVO4 laser. Power analysis enables determination of the factors limiting conversion efficiency.
We report a cw 1064 nm-pumped external cavity diamond Raman laser operating at the 1240 nm. The slope efficiency was 42% and maximum output power, currently limited by the available pump power, was 7.5 W.
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