We have observed electromagnetically induced transparency (EIT) in rare-earth Pr<sup>3+</sup>-doped Y<sub>2</sub>SiO<sub>5</sub> over the spectral hole-burning temperature. The transmission of the probe laser beam is increased by a factor of exp(1.4) at 12 K when a coupling laser of 1.2 kW/cm<sup>2</sup> is applied to the system. The observation of EIT over the spectral hole-burning temperature in a rare-earth–doped solid represents important progress toward high-density echo-based optical memories at higher temperatures.
© 1999 Optical Society of America
Byoung S. Ham, Selim M. Shahriar, and Philip R. Hemmer, "Electromagnetically induced transparency over spectral hole-burning temperature in a rare-earth–doped solid," J. Opt. Soc. Am. B 16, 801-804 (1999)