Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session K00: Poster Session II (4pm-6pm CDT)
4:00 PM,
Wednesday, June 5, 2024
Room: Hall BC
Abstract: K00.00120 : High quality tweezer generation using automated alignment and adaptive optics
Presenter:
Bharath Hebbe Madhusudhana
(Los Alamos National Lab)
Authors:
Bharath Hebbe Madhusudhana
(Los Alamos National Lab)
Malcolm G Boshier
(Los Alamos Natl Lab)
Katarzyna Krzyzanowska
(Los Alamos Natlional Laboratory)
trapped in an tweezer array. Two of the core hardware capabilities that has made this progress
possible are spatially fine-tuned control of lasers and diffraction-limited imaging. Advancing
these capabilities is therefore also receiving an increased attention recently. Here, we show how
to automate the delicate optical alignment necessary to produce diffraction limited tweezers [1].
We generalize the elementary technique of cross-walking to multi-variable cross-walking, which
can be implemented without human intervention. Mathematically, this is a variant of the well-
known Alternating Minimization (AM) algorithm in convex optimization and is closely related to
the Gauss-Seidel algorithm. Therefore, we refer to our multi-variable cross-walking algorithm as
the modified AM algorithm. We apply this algorithm to mechanically align high numerical
aperture (NA) objectives and show that we can produce high-quality diffraction-limited tweezers
and point spread functions (PSF). After a coarse alignment, the algorithm takes about 1 hour to
align the optics to produce high-quality tweezers. Moreover, we use the same algorithm to
optimize the shape of a deformable mirror along with the mechanical variables and show that it
can be used to correct for optical aberrations produced, for example, by glass thickness when
producing tweezers and imaging point sources. The shape of the deformable mirror is
parametrized using the first 14 non-trivial Zernike polynomials, and the corresponding
coefficients are optimized together with the mechanical alignment variables. We show PSF with
a Strehl ratio close to 1 and tweezers with a Strehl ratio > 0.8.
[1] Bharath Hebbe Madhusudhana, Katarzyna Krzyzanowska and Malcolm Boshier Optical
tweezer generation using automated alignment and adaptive optics, arXiv: 2401.00860
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