Three-dimensional Dammann array

Yu, Junjie; Zhou, Changhe; Jia, Wei; Cao, Wugang; Wang, Shaoqing; Ma, Jun; Cao, Hongchao

doi:10.1364/ao.51.001619

Cited by 48 publications

(28 citation statements)

References 30 publications

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“…A Dammann grating is a binary phase plate with multiple periods [1][2][3], each period of which is composed of phase transitional points whose positions are optimized to produce equal intensity at different spectrum orders. A typical Dammann grating is illustrated in Fig.…”

Section: Dammann Laser-writing Facilitymentioning

confidence: 99%

Design and applications of digital diffractive gratings

Zhou

Wang

et al. 2014

SPIE Proceedings

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This paper will report our recent works on fabrication, evaluation, and applications of gratings. We are using the Dammann parallel laser writing facility for fabrication of gratings. High-efficiency reflective gratings and large-sized grating are fabricated. We have fabricated high-power reflective laser vortex grating with expectation of a new laser drilling effect for laser fusion in the future, which is just evaluated by our developed method. These gratings are essential elements for high-power laser systems and other high-demanding metrology applications.

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Section: Dammann Laser-writing Facilitymentioning

confidence: 99%

Design and applications of digital diffractive gratings

Zhou

Wang

et al. 2014

SPIE Proceedings

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“…Therefore, it is easy to understand that a focused vortex with charge of ml should be generated at the mth diffraction order of the corresponding DZP, and thus a sequence of coaxial focused vortices is generated in the focal volume when the SDZP is located before an objective. The axial spacing between any two adjacent orders of this dipole vortex array can be predicted by the formula of the axial spacing of the DZP, and it is expressed as Δz N ξ × λ ∕ 1 − cos α, where N ξ 1 − cos α ∕Λ ξ is the period number in ξ of the DZP [14]. As shown in Fig.…”

Section: Design and Fabrication Of An Sdzpmentioning

confidence: 99%

“…The concept of this SDZP is derived from embedding the spiral phase structure into a Dammann zone plate (DZP) [14], which can produce a series of coaxial focus spots along the propagating direction. When an SDZP is placed before a focusing objective, a series of coaxial dipole vortices could be achieved in the focal volume for plane-wave incident beams.…”

Section: Introductionmentioning

confidence: 99%

Generation of dipole vortex array using spiral Dammann zone plates

Zhou

Jia

et al. 2012

Appl. Opt.

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We propose a new diffractive optical element, called a spiral Dammann zone plate (SDZP), to generate a series of dipole vortices along the optical axis in the focal region of a focusing objective. By combining this SDZP and another Dammann grating, we describe the generation of three-dimensional dipole vortex arrays in the focal volume of an objective. For experimental demonstration, a 1×5 SDZP with base charge of l=1 is fabricated by using lithography and wet-etching techniques, and a 1×5 coaxial dipole vortex array is achieved for an objective of NA=0.127. Furthermore, by combining the 1×5 SDZP and another 5×5 Dammann grating, a 5×5×5 dipole vortex array is also experimentally demonstrated. The results show that topological charges of these 5×5 vortex arrays on five coaxial planes could be tunable by selecting a vortex beam carrying different charge as the incident field.

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“…The irradiance uniformity in the case of the CW source is approximately 10 −5 [11]. Small discrepancies in the height of the peaks are caused mainly due to deviations of the 0 − π transition locations from their ideal values when encoding Dammann lenses into an SLM [14,15]. For an ultrashort laser pulse of 100 fs falls of 0.3% and 1.5% (for n 1 and n 2 orders, respectively) are registered.…”

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On-axis non-linear effects with programmable Dammann lenses under femtosecond illumination

et al. 2013

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We demonstrate the utilization of Dammann lenses codified onto a spatial light modulator (SLM) for triggering nonlinear effects. With continuous wave illumination Dammann lenses are binary phase optical elements that generate a set of equal intensity foci. We theoretically calculate the influence of ultrashort pulse illumination on the uniformity of the generated pattern, which is affected by chromatic aberration for pulses with temporal widths lower than 100 fs. The simulations also indicate that acceptable uniformity can be achieved for pulses of several fs by shortening the distance among foci which can be easily modified with the SLM. Multifocal second-harmonic generation (SHG) and on-axis multiple filamentation are produced and actively controlled in β − BaB 2 O 4 (BBO) and fused silica samples, respectively, with an amplified Ti: Sapphire femtosecond laser of 30 fs pulse duration. The study of the non-linear processes [1] that take place during the interaction of light with matter has benefited from the high peak powers achieved with amplified femtosecond (fs) lasers [2]. This opens a huge gate toward the development of many applications in the nonlinear optics field. For instance, second-order parametric processes [3] are efficiently used to tune the central wavelength through SHG or sum/difference-frequency generation, expanding the accessible wavelength range of standard Ti:sapphire laser systems. Third-order processes are also very often exploited to increase the spectral width of fs pulses through optical-Kerr effect (self-phase modulation), or in combination with strongfield ionization and higher order processes (supercontinuum generation [4] and filamentation [5]). The increase of the spectral width by means of the abovementioned nonlinear effects allows subsequent compression of the pulse to a much shorter temporal duration [6]. Most of these processes require the focusing of the laser beam [7] just to reach the high intensities needed to trigger the desired effect. However, under certain circumstances, the spatiotemporal properties of the pulse focusing itself can be exploited to gain control over the nonlinear mechanisms taking place. In this sense, diffractive lenses have been recently employed for SHG [8] or in super continuum generation [9]: the strong chromatic aberration induced by diffraction changes the spectral properties of the pulse.On the other hand, Dammann diffraction gratings are binary phase distributions of alternate 0, π zones for well-defined transient points [10,11]. For continuous wave (CW) illumination, these gratings generate diffraction patterns characterized by a number N of diffracted orders with the same peak intensity. This concept can be easily extended to lenses. The phase of a converging refractive lens can be represented by πr 2

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Three-dimensional Dammann array

Cited by 48 publications

References 30 publications

Design and applications of digital diffractive gratings

Design and applications of digital diffractive gratings

Generation of dipole vortex array using spiral Dammann zone plates

On-axis non-linear effects with programmable Dammann lenses under femtosecond illumination

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