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The first spectroscopic measurements of R′ aggregate color centers contained in polycrystalline LiF hosts are reported. The inhomogeneous and homogeneous widths of the 830-nm zero phonon line are measured by conventional grating spectroscopy and by photochemical hole burning spectroscopy using a current tuned GaAlAs diode laser with 3-mW output power. An extensive photochemical hole burning comparison between single and polycrystalline samples is presented.Peer Reviewe

Hole burning spectroscopy of R′ aggregate color centers in polycrystalline LiF thin films using a GaAlAs diode laser