Abstract The spontaneous emission spectrum from a driven three-level atom placed inside a double-band photonic crystal has been investigated. We use the model which assumes the upper levels of the atomic transition are coupled via a classical driving field. The transition from one of the upper levels to lower level couples to the modes of the modified reservoir, and the transition from the oth...

Abstract The link performance of free space optical communications (FSOC) and deep (DSOC) are investigated by considering two scenarios in communications, for example, the downlink uplink between earth ground stations near geostationary (GEO) satellites, spacecraft with large distance 1 astronomical unit (AU) to earth. Generally a larger than 0.01 AU or approximately 1,500,000 km from Earth is ...