Generation of nearly diffraction-free laser beams

Microfabrication and Drilling Using Diffraction-Free Pulsed Laser Beam Generated with Axicon Lens

“…Although several methods of generating diffractionfree beams have been reported (9), (10) , the use of an axicon lens (5) - (8) is the simplest method of implementing and of-fers the prospect of high conversion efficiencies. Figure 1 shows the schematic of the experimental setup used to generate a diffraction-free beam.…”

Generation of nearly nondiffracting Bessel beams with a Fabry–Perot interferometer

“…For example, this type of angular spectrum can be obtained by applying an annular slit in the focal plane of a lens 1 or by the use of an axicon, 2 a holographic process, 3,4 a Fabry-Perot interferometer, 5,6 or a special type of laser cavity. 7,8 A novel concept for the generation of nearly nondiffracting Bessel beams as applied to microlithography was described in Ref. 9.…”

Quasi-Optical Bessel Resonator

“…In contrast to structures of the resonators proposed in [18][19][20], the axicon-based resonator is probably the most attractive one because of its simplicity and high conversion efficiency [5]. It is known that an axicon converts an incident plane wave into an approximation to Bessel beam [11][12][13][14], located within the interference zone ECFD, as depicted in Fig.…”

“…The other class is formed by methods relying on a resonator frame to produce the Bessel-type modes. For example, resonators with annular intracavity elements [18], output mirrors having annular apertures [19], phaseconjugating mirrors [20], and axicon-based resonators [3][4][5][21][22][23][24]. When compared with the passive schemes, the active have the following advantages [5,23]: They generate the Bessel-type modes directly from the resonators, omitting the external filter elements and resulting in high-output-power Bessel beams; another is the possibility of realizing intracavity frequency conversion of Bessel beams.…”