公开(公告)号：WO2022271787A1

公开(公告)日：2022-12-29

申请号：PCT/US2022/034465

申请日：2022-06-22

Applicant: THE GENERAL HOSPITAL CORPORATION

Inventor： HARPER, Danielle, J. ,  VAKOC, Benjamin, J.

IPC: G01B9/02002 ,  G01J3/45 ,  G01N21/47 ,  G01N21/45 ,  G01N21/25 ,  G01J3/02

Abstract: An optical coherence tomography system which is capable of operating in two or more optical bandwidth configurations for the purpose of trading off between high resolution imaging and high signal-to-noise ratio imaging, wherein the later enables deeper imaging depth. The system and associated methods allow for both high resolution, shallow penetration depth and low resolution, deep penetration depth optical coherence tomography imaging to be performed using a single light source. Methods and apparatus are described that allow a single system to dynamically switch between modes, or to operate in a hybrid mode that achieves a balance between resolution and SNR/depth of penetration.

公开(公告)号：WO2022256466A1

公开(公告)日：2022-12-08

申请号：PCT/US2022/031859

申请日：2022-06-02

Applicant: KLA CORPORATION

Inventor： LIU, Helen ,  ZHANG, GuoQing ,  LI, Hui

IPC: G01B9/02 ,  G01B9/02002 ,  G01B9/02001 ,  G01B9/02055 ,  G01B11/06 ,  G01B11/24 ,  H01L21/66

Abstract: Systems and methods for unwrapping a phase map are disclosed. Such systems and methods may include receiving a wrapped phase map associated with an interferometric measurement of a sample including patterned features; removing a tilt from the wrapped phase map; generating a background; detecting features in the wrapped phase, the features in the wrapped phase map corresponding to least some of the patterned features of the sample; replacing phases of the features with the background at corresponding locations in the wrapped phase map; unwrapping the modified wrapped phase map using a global phase-unwrapping; applying local phase-unwrapping to restore the phases of the features; and reapplying the tilt to generate an output unwrapped phase map.

公开(公告)号：WO2022191921A1

公开(公告)日：2022-09-15

申请号：PCT/US2022/012632

申请日：2022-01-15

Applicant: HRL LABORATORIES, LLC

Inventor： AUTRY, Travis ,  COUNTS, Ian ,  ELLIS, Jennifer ,  KIM, Danny ,  ROPER, Christopher

IPC: G01B9/02001 ,  G01B9/02002 ,  G01B9/02

Abstract: In some variations, an interferometric frequency-reference apparatus comprises: an atom source configured to supply neutral atoms to be ionized; an ionizer configured to excite the neutral atoms to form ionized atoms; an ion collimator configured to form a collimated beam of the ionized atoms; probe lasers; and a Doppler laser configured to determine a ground-state population of the ionized atoms, wherein the atom source, the ionizer, and the ion collimator are disposed within a vacuum chamber. Other variations provide a method of creating a stable frequency reference, comprising: forming ionized atoms from an atomic vapor; forming a collimated beam of ionized atoms; illuminating ionized atoms with first and second probe lasers; adjusting the frequencies of the first probe and second probe lasers using Ramsey spectroscopy to an S → D transition of ionized atoms; and determining a ground-state population of the ionized atoms with another laser.