Quasi-Dammann grating with proportional intensity array spots

Li, Shaoxia; Yu, Gang; Zheng, Caiyun; Tan, Qiaofeng

doi:10.1364/ol.33.002023

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…19 This loss can be reduced through the design of more complex phase masks with iterative optimization algorithms. 16 However, in view of the nonlinear character of the interaction, only the high intensity peaks contribute to process and in the frame of the present work, the step grating phase mask is adequate for the DMSO demonstration. Moreover, this type of phase modulation gives a straightforward mean to control the separation of the two processing foci; a possibility more difficult to design in the case of more complex phase masks.…”

Section: Principle Of Dynamic Multispot Operationmentioning

confidence: 92%

Dynamic ultrafast laser beam tailoring for multispot photo-inscription of photonic devices in bulk transparent materials

et al. 2009

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Femtosecond laser processing of bulk transparent materials can generate localized increase of the refractive index. Thus, translation of the laser spot give potential access to three dimensionnal photowriting of waveguiding structures. Increasing the number of machining foci can considerably reduce the processing efforts when complex photonic structures are envisaged such as waveguide arrays. The present report presents a technique of dynamic ultrafast laser beam spatial tailoring for parallel writing of photonic devices. The wavefront of the beam is modulated by a periodical binary (0-π) phase mask of variable pattern to achieve dynamic multispot operation. The parallel photoinscription of multiple waveguides is demonstrated in fused silica. Using this method, light dividers in three dimensions relying on evanescent coupling are reported and wavelength-division demultiplexing (WDD) devices were achieved in single sample scan.

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Section: Principle Of Dynamic Multispot Operationmentioning

confidence: 92%

Dynamic ultrafast laser beam tailoring for multispot photo-inscription of photonic devices in bulk transparent materials

et al. 2009

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“…In ref. [7], parameters for characterization of QDG, such as the diffractive order, the uniformity and diffractive efficiency have been defined.…”

Section: Grating Design and Fabricationmentioning

confidence: 99%

“…The purpose of this paper is to employ a quasi-Dammann grating (QDG) [7] to transform the laser beam into array spots with edge intensity enhanced in the far field. And hence, get uniform shaped hardened band and better wear resistance of the sample surface hardened.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Dammann grating with proportional intensity of array spots for surface hardening of metal

Tan

et al. 2010

Sci. China Phys. Mech. Astron.

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For surface hardening of metal, a quasi-Dammann grating (QDG) is proposed and fabricated to generate array spots with proportional-intensity distribution. To get uniformly hardened band distribution and improve the wear resistance of the sample surface, a three-order QDG is designed to produce array spots with enhanced intensity in the edge. The design and fabrication of the QDG are described in detail. The surface profile of the fabricated grating was measured, which shows that the fabrication error is less than 2%. The laser beam intensity distribution shaped by the QDG was tested by a laser beam analyzer to verify the validity of the QDG. The application of the QDG in the laser surface hardening of metal was experimentally investigated, and the results show that the hardness distribution of the modified layer and the wear resistance of the sample surface are improved significantly by using the QDG.

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“…Since the relationship between the zero-order intensity and the etching depth is symmetric with respect to the ideal depth and is distributed parabolically upward. Therefore, as long as there is a deviation between the etching depth and the theoretical depth, the zero-order light intensity is enhanced regardless of the positive or negative depth error [14]- [17]. However, if a weaker zero-order diffracted light is required, redesigning the structure of the grating should be taken to achieve this.…”

Section: Introductionmentioning

confidence: 99%

Alternative Design of Dammann Grating for Beam Splitting With Adjustable Zero-Order Light Intensity

et al. 2019

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Conventional Dammann grating is a binary-phase (0, π) transmission grating capable of splitting an incoming laser beam into multiple outgoing beams with equal intensity. In this paper, we present an alternative design for Dammann-type beamsplitter with a non π-phase shift value. In the design, the simulated annealing algorithm is taken to optimize the grating structure and phase difference simultaneously. We find that this non 0-π phase grating exhibits interesting properties. When the etching depth is slightly lower than the theoretical depth, the zero-order light intensity is enhanced compared to other diffraction orders. Conversely, when the etching depth is slightly greater than the theoretical depth, the zero-order light intensity is attenuated. This allows us to flexibly adjust the brightness of the zero-order diffractive light. In contrast, the deviation of the etching depth will always result in a brighter zero-order light for the conventional Dammann grating. Simulations and experiments are performed to verify the feasibility of the proposed grating.

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Quasi-Dammann grating with proportional intensity array spots

Cited by 13 publications

References 9 publications

Dynamic ultrafast laser beam tailoring for multispot photo-inscription of photonic devices in bulk transparent materials

Dynamic ultrafast laser beam tailoring for multispot photo-inscription of photonic devices in bulk transparent materials

Quasi-Dammann grating with proportional intensity of array spots for surface hardening of metal

Alternative Design of Dammann Grating for Beam Splitting With Adjustable Zero-Order Light Intensity

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