Abstract
We describe an effective external cavity for narrowing the spectral linewidth of a multiarray stack of laser diode arrays. For a commercially available free-running five-array laser diode array operating at , we narrow the spectral linewidth to at FWHM with of cw power output. This technique leads to the possibility of higher-efficiency, lower-cost production of hyperpolarized noble gases for magnetic resonance imaging.
© 2005 Optical Society of America
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