Abstract

Since the observation of transparent light at line center,¹ many researchers have studied basic physic of such phenomenon by using atomic gases,²,³ defected crystals,⁴ and semiconductor quantum wells⁵ Recently the observations of several nonlinear optical processes in solids⁶ open the door to practical applications of optical memories, coherence spectroscopy, and lasers without inversion. In the present paper, a new concept of quantum switching is discussed.

© 2000 IEEE