Spectrally narrowed external-cavity high-power stack of laser diode arrays.
We describe an effective external cavity for narrowing the spectral linewidth of a multiarray stack of laser diode arrays. For a commercially available 279-W free-running five-array laser diode array operating at 60 A, we narrow the spectral linewidth to 0.40 nm at FWHM with 115 W of cw power output. This technique leads to the possibility of higher-efficiency, lower-cost production of hyperpolarized noble gases for magnetic resonance imaging.
Department of Physics, University of New Hampshire, Durham, New Hampshire 03824, USA. hz5w@yahoo.com
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