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.
© 2005 Optical Society of America
H. Zhu, I. C. Ruset, and F. W. Hersman, "Spectrally narrowed external-cavity high-power stack of laser diode arrays," Opt. Lett. 30, 1342-1344 (2005)