12 Swanson G J. Binary optics technology: Theoretical limits on the diffraction efficiency of multilevel diffractive optical elements. TechnicalReport. MIT Lincoln Laboratory, 1991
17 Sweatt W C. Mathematical equivalence between a holographic optical element and an ultra-high index lens. J Opt Soc Am, 1979, 69:486-487？？
[7]
1 Howard J W, Abel I R. Narcissus: Reflections on retroreflections in thermal imaging systems. Appl Opt, 1982, 21: 3393-3397？？
[8]
2 Lloyd J M. Thermal Imaging Systems. New York: Plenum Press, 1975. 275-281
[9]
3 Rayces J L, Lebich L. Exact ray tracing computation of narcissus equivalent temperature difference in scanning thermal imagers. ProcSPIE, 1992, 1752: 325-332
[10]
4 Lu K, Dobson S J. Accurate calculation of narcissus signatures by using finite ray tracing. Appl Opt, 1997, 36: 6393-6398？？
