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Our approach concerning the development ofhard target returnCO2 DIAL transmitter/receiver systems is two phased: i) through analysis and experiment, develop a fundamental understanding ofthe transmitter/receiver physics specific to DIAL systems and ii) apply these fundamentals in the development of optimal performance DIAL transmitter/receiver systems.We present our progress and results towards these objectives with the following topics addressed: A general overview of the DIAL transmitter/receiver system characterization effort with a focus on transceiver noise processes. The effects of correlated noise on DIAL performance, especially those effecting statistical convergence over long sample structures, is introduced. And, preliminary measurements of a low-noise, "white" receiver prototype are presented. I Detector Signal Ii and [Processing J Amplifier _____________________________ Range Signal Figure 1. Simplified DIAL System Signal Chain. 2 / SPIE Vol. 2702 0-8194-2076-X/96/$6.O0 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx SPIE Vol. 2702 / 3 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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In this paper we briefly present the theory of Fourier Transform Heterodyne (FTH), describe past verification experiments carried out, and discuss the experiment designed to use this new imaging technology to perform optical correction. FTH uses the scalar projection of a reference laser beam and a test laser beam onto a single element detector. The complex current in the detector yields the coefficient of the scalar projection. By projecting a complete orthonormal basis set of reference beams onto the test beam, the amplitude and phase of the test beam can be measured, allowing the reconstruction of the phasefront of the image. Experiments to determine this technique's applicability to optical correction and optical self-correction are continuing. Applications of this technique beyond optical correction include adaptive optics; interferometry; and active, high background, low signal imaging.