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PHASE FORMERS OF DIFFRACTION-FREE BEAMS (BESSEL MODES)
Methods and software for design of phase DOEs to generate diffraction-free beams have been developed.

Бинарная фаза ДОЭ:

Stable: (n, m): n № n'
Stable two-mode Bessel beam (experiment)

z = 25 мм	z = 55 мм	z = 85 мм

Binary-phase DOE:

Periodic: (n, m): n = n'
Periodic three-mode Bessel beam (experiment)

z = 75 мм	z = 85 мм	z = 95 мм

Diffraction efficiency=90%

Bessel modes can be used for image transmission through stepped-index optical fibers

Binary phase DOE with carrier

Rotation condition (n,m):

A pair of rotating Bessel beams (experiment)

z = 170 мм	z = 175 мм	z = 180 мм	z = 185 мм

Every beam has a 40% diffraction efficiency

Publications:
1. Quantum Electronics, 1991, v.18, N11, pp.1391-1394.
2. J. Mod. Opt., 1995, v.42, N 6, pp.1231-1239.
3. Quantum Electronics, 1996, т.23, N2.
4. J. Mod.Opt., 1997, v.44, N7, pp.1409-1414.
5. Optics and spectroscopy, 1998, v.84, N5.
6. J. Mod.Opt., 1998, v.45, N11, pp.2355-2369.
s 7. Optik, 1999, v.110, N3, pp.137-1444

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