Optimized kinoform structures for highly efficient fan-out elements

<title>Diffractive phase element for reducing the diameter of the main lobe of a focal spot</title>

“…The SQM leads a quantized phase distribution gradually by extending the quantization area as the iteration process proceeding. 1 " In the design procedure for DPEs, we used the same parameters for SQM as described in Ref. 10; that is, Q=5, P=10, and 5(1) = 0.3, 6(2) = 0.5, E(3) = 0.6, E(4) = 0.7, 5(5) = 0.75, E(6) = 0.8, 5(7) = 0.85, 5(8) = 0.9, 5(9) = 0.95, and 5(10) = 1.0, where Q is the number of iteration in each subdivided cycle in which the quantization area is fixed, P is the total number of subdivided iteration cycles, and c(P) indicates ratio of a quantization area to the total area in the pth subdivided iteration cycle.…”

“…Especially, DPEs have ability to create distinctive optical functions designed by a computer with high efficiency of light usage in a thin element. So DPEs have been applied as special optical elements such as optical interconnections, 1 beam shaping, 2 mode formers 3 and so on.…”

Quantum Information with Structured Light

“…Here, γ m and α m are relative phase and intensity parameters associated with different diffraction orders (See Table (2.1)). These parameters can be optimized using numerical or analytical methods to uniformly distribute more than 99 percent of the incident light between the copies [45,46]. Similar to the case of geometrical mapping discussed above, a second phase plate is needed to compensate the introduced phase distortions in the Fourier plane of the fan-out element.…”

Improvement of combining efficiency of coherent beam combination from phase-locked laser array by Dammann grating

“…Fig. 6 is the one period phase profile 10 of the Continuous grating which has a continuous phase distribution which is the key to high diffraction efficiency. Fig.…”