Fig. 1. Structure of the enhanced self-heterodyne SAIL system. PBS: polarizing beam splitter; WP: wave plate.

Fig. 2. Configuration to translate the wavefront using cylindrical lenses; x means the cylindrical lenses L1 and L2 are moving in the direction orthogonal to the direction of travel, y means the cylindrical lenses L3 and L4 are moving in the travel direction.

Fig. 3. (a) Magnitude and (b) phase distributions of the focused image in the orthogonal direction of travel and (c) a 2D image focused subsequently in the travel direction for a 0.3mm×0.3mm point target. The distribution of the final image is (d) in orthogonal direction and (e) in the travel direction for a 0.3mm×0.3mm point target.

Fig. 4. (a), (b), and (c) are the final images for a 0.3mm×0.3mm point target at output power of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier. (d), (e), and (f) are the distribution of the final image in the travel direction for a 0.3mm×0.3mm point target at the output powers of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier.

Fig. 5. Self-heterodyne receiver in the down-looking SAIL.

Fig. 6. (a), (b), and (c) are the final images for a 0.3mm×0.3mm point target in the down-looking SAIL at the output powers of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier. (d), (e), and (f) are final images in the travel direction for a 0.3mm×0.3mm point target in the down-looking SAIL at the output powers of 15 mW, 2 mW, and 750 μW of the optical fiber amplifier.

Table 1. SNR of Point Target Final Image in Enhanced Self-heterodyne SAIL System

Table 2. SNR of Point Target Final Image in Down-looking SAIL