Wave representation of geometrical laser beam trajectories in a hemiconfocal cavity

Chen, Y. F.; Jiang, C. H.; Lan, Yu-Pin; Huang, Kai–Feng

doi:10.1103/physreva.69.053807

Cited by 56 publications

(59 citation statements)

References 19 publications

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“…Note that all the discussion corresponding to the off-axis pumping with (∆x, 0) can be applied to the case of (0, ∆y) for the degenerate family in terms of ψ (HG) 0,m 0 +Q·K,s 0 −P ·K (x, y, z). The wave-packet patterns of the coherent states ψ M n 0 (x, y, z; φ 0 ) are verified to manifest the RWD, and the phase factor φ 0 can be used to link to the starting ray of the geometric periodic orbits [31]. When M = 0 in Eq.…”

Section: A Frequency-degenerate Resonatormentioning

confidence: 82%

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Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Shen

Wan

Meng

et al. 2018

Laser Congress 2018 (ASSL)

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We originally demonstrate the vortex beams with patterns of closed polygons [namely polygonal vortex beams (PVBs)] generated by a quasi-frequency-degenerate (QFD) Yb:CALGO laser resonator with astigmatic transformation. The PVBs with peculiar patterns of triangular, square, and parallelogram shapes carrying large orbital angular momentums (OAMs) are theoretically investigated and experimentally obtained in the vicinity of the SU (2) degenerate states of laser resonator. The PVBs in QFD states are compared with the vortex beams with patterns of isolated spots arrays located on the triangle-, square-, and parallelogram-shaped routes [namely polygonalspots-array vortex beams (PSA-VBs)] under normal SU(2) degenerate states. Beam profile shape of PVB or PSA-VB and OAM can be controlled by adjusting the cavity length and the position of pump spot. The simulated and experimental results validate the performance of our methodto generate PVB, which is of great potential for promoting novel technologies in particle trapping and beam shaping.

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Section: A Frequency-degenerate Resonatormentioning

confidence: 82%

“…The optical resonator satisfying a degenerate state is called frequency-degenerate cavity (FDC). Without loss of generality, we consider a plano-concave laser cavity with the length of L, comprised of a gain medium, a concave spherical mirror with the radius of curvature of R, and a planar output coupler [30,31].…”

Section: A Frequency-degenerate Resonatormentioning

confidence: 99%

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Shen

Wan

Meng

et al. 2018

Laser Congress 2018 (ASSL)

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show abstract

“…where M +1 is the number of Hermite-Gaussian (HG) modes in frequency-degenerate family of ψ (HG) n0+Q·K,0,s0−P ·K (x, y, z). Therein, n 0 and s 0 represent the minimum transverse and maximum longitudinal orders in the degenerate family, respectively; the phase factor φ 0 links to the ray trajectory of classical geometric periodic orbits [15]. When M = 0 in Eq.…”

Section: B Diffraction Of Vortex Su(2) Wave-packetmentioning

confidence: 99%

Truncated triangular diffraction lattices and orbital-angular-momentum detection of vortex SU(2) geometric modes

Shen¹,

Fu²,

Gong³

2018

Opt. Express

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We for the first time report the truncated diffraction with a triangular aperture of the SU(2) geometric modes and propose a method to detect the complicated orbital angular momentum (OAM) of an SU(2) wave-packet, to the best of our knowledge. As a special vortex beam, a nonplanar SU(2) mode carrying special intensity and OAM distributions brings exotic patterns in truncated diffraction lattice. A meshy structure is unveiled therein by adjusting the illuminated aperture in vicinity of the partial OAM regions, which can be elaborately used to evaluate the partial topological charge and OAM of an SU(2) wave-packet by counting the dark holes in the mesh. Moreover, through controlling the size and position of the aperture at the center region, the truncated triangular lattice can be close to the classical spot-array lattice for measuring the center OAM. These effects being fully validated by theoretical simulations greatly extend the versatility of topological structures detection of special beams.

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“…However, the casting process is involved with many problems such as the rather low cooling rate, the large temperature difference between the exterior and the interior, the high internal stress, and limited ingot sizes [5][6][7][8][9][10]. The problems mentioned above can be overcome by the crucible movable spray deposition technology [11,12]. However, the as-deposited performs, usually with the porosity up to 5-15 vol%, are not proper for structural applications due to the relatively inferior mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Densification of large-size spray-deposited Al–Mg alloy square preforms via a novel wedge pressing technology

Chen

Fan

et al. 2009

Materials Science and Engineering: A

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Wave representation of geometrical laser beam trajectories in a hemiconfocal cavity

Cited by 56 publications

References 19 publications

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Truncated triangular diffraction lattices and orbital-angular-momentum detection of vortex SU(2) geometric modes

Densification of large-size spray-deposited Al–Mg alloy square preforms via a novel wedge pressing technology

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