Abstract:Wavefront control is a significant parameter in inertial confinement fusion (ICF). The complex transmittance of large optical elements which are often used in ICF is obtained by computing the phase difference of the illuminating and transmitting fields using Ptychographical Iterative Engine (PIE). This can accurately and effectively measure the transmittance of large optical elements with irregular surface profiles, which are otherwise not measurable using commonly used interferometric techniques due to a lack… Show more
“…Diffractive patterns are numerically achieved by the discrete Eqs. ( 8) and (9). The exposure time is 0.5 s, which is shorter than that in the previous reports.…”
mentioning
confidence: 70%
“…In the past five years, PIE has been applied in many fields such as biomedical research, [4−6] materials science, [7,8] precision measurement [9] and computer holography. [10] In Refs.…”
The retrieval of ptychographical imaging encounters a degradation produced by motion of samples. The mechanism of capturing the diffractive patterns of a sample which is motile is simulated numerically. The relation between the retrieval degradation and the amplitude of motion is evaluated quantitatively. Experiments indicate that the reliability and resolution of the complex amplitude retrieval of a sample is inversely proportional to its vibratory amplitude. A random phase modulated aperture is employed to cure the degradation produced by the motion of samples to a certain extent.
“…Diffractive patterns are numerically achieved by the discrete Eqs. ( 8) and (9). The exposure time is 0.5 s, which is shorter than that in the previous reports.…”
mentioning
confidence: 70%
“…In the past five years, PIE has been applied in many fields such as biomedical research, [4−6] materials science, [7,8] precision measurement [9] and computer holography. [10] In Refs.…”
The retrieval of ptychographical imaging encounters a degradation produced by motion of samples. The mechanism of capturing the diffractive patterns of a sample which is motile is simulated numerically. The relation between the retrieval degradation and the amplitude of motion is evaluated quantitatively. Experiments indicate that the reliability and resolution of the complex amplitude retrieval of a sample is inversely proportional to its vibratory amplitude. A random phase modulated aperture is employed to cure the degradation produced by the motion of samples to a certain extent.
“…Figure 17.(a) Manufactured CPP, (b) CPP design value, (c) measurement result of a Zygo interferometer, (d) wrapped phase of the measured modulation function, (e) unwrapped phase of the measured modulation function, and (f) the measured result and designed value along the horizontal lines of (b) and (e) (from Ref. [46]).…”
Section: Pie and Its Applicationmentioning
confidence: 99%
“…Illumination on the specimen in Figure 16 can be measured with the use of ePIE, and this property provides a new method for measuring the complex transmittance of large optical elements used in high power laser applications [46] . Practical measurement was conducted to illustrate the feasibility of this method by CPP, which is a key element in ICF systems that smoothens the laser beam to ensure an ideal focal spot with a highly irregular surface profile [47, 48] .…”
The properties of a series of phase measurement techniques, including interferometry, the Hartmann-Shack wavefront sensor, the knife-edge technique, and coherent diffraction imaging, are summarized and their performance in high power laser applications is compared. The advantages, disadvantages, and application ranges of each technique are discussed.
“…For the optical metrology of imaging systems [7,9,10,[14][15][16], the generalized exit pupil function [17], rather than an object, is the unknown complex field of interest. A subaperture or mask is introduced in a plane ideally conjugate to the pupil.…”
We introduce unknown-transverse translation diversity phase retrieval: a ptychographic algorithm for optical metrology when a subaperture is translating through a plane conjugate to the exit pupil in a very poorly known fashion. The algorithm estimates the direction of translation and the distance traveled by the subaperture from one point spread function (PSF) to the next. It also estimates unknown point target motion and rotations of the subaperture between PSF acquisitions from the PSF data.
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