High Gain Threshold-less Laser System based on Optical Phase Conjugation

In this Phase I proposal, we outline a plan to develop a novel ultra sensitive and high-gain laser system. Its operation is based on a high-gain thresholdless optical phase-conjugate mirror (OPCM). Such a laser system will be capable of tracking remoteobjects. A stimulated Brillouin scattering effect is used in the proposed approach for development of a high-gain pulsed laser system in an intra-cavity four-wave mixing architecture. In this proposal, we outline the operational principles of the systemand show how the high-gain conditions (up to 108) can be achieved for a minimal intensity level of a signal of 10 14J. During Phase I, we will perform an extensive theoretical analysis, design a laboratory system, and demonstrate the key components of thesystem and its operation. During Phase II we will scale the technology for field demonstration. The proposed thresholdless approach for a high-gain laser system can significantly enhance the amplification of a very low intensity optical signal and in thisway improve precision and accuracy with remote laser tracking, discriminating and imaging of a small objects. Because of increased accuracy, the control of satellites can be performed less frequently and with fewer tracking stations, thus saving onoperational costs. In the government sector the proposed system could find applications in the Air Force and MDA for tracking and engaging missiles, especially during their mid-course phase. Small size, less system complexity and consequently systemmobility are its operational benefits. Commercial applications include, but are not limited to, commercial aircraft, satellite tracking, and high-speed wireless communication. In addition, the proposed techniques can be used for improving the performancecharacteristics of lasers when a high-energy pulse with a required beam shape on a target surface is of interest.