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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Absolute linear-in-k spectrometer designs enabled by freeform optics.

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    Freeform optics linearize spectrometers for spectral-domain optical coherence tomography (SD-OCT), significantly reducing k-nonlinearity. This advancement enhances imaging depth and sensitivity without post-processing.

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    Area of Science:

    • Optical Engineering
    • Biomedical Optics
    • Spectroscopy

    Background:

    • Linear-in-wavenumber (k) spectrometers offer advantages in spectral-domain optical coherence tomography (SD-OCT) by reducing signal processing time and improving sensitivity.
    • Traditional spectrometers often require post-k-interpolation, which can introduce artifacts and reduce performance.
    • Achieving precise k-linearity in spectrometer design is crucial for high-performance SD-OCT.

    Purpose of the Study:

    • To investigate the use of freeform optics for creating highly linear-in-k spectrometers.
    • To minimize residual k-nonlinearity in SD-OCT systems through advanced optical design.
    • To evaluate the performance impact of freeform spectrometers on SD-OCT imaging capabilities.

    Main Methods:

    • Designed freeform optical systems to achieve linearization of spectrometers in the wavenumber (k) domain.
    • Utilized Fringe Zernike coefficients up to the 16th and 37th terms to quantify and minimize k-nonlinearity.
    • Developed a simulation model to assess the performance of SD-OCT systems incorporating the designed freeform spectrometers.
    • Evaluated axial point spread function (PSF) and imaging depth performance.

    Main Results:

    • Reduced k-nonlinearity from 2.47% in a benchmark spectrometer to 2.79 × 10-5% and 3.36 × 10-9% using freeform optics.
    • Achieved a roll-off gain of 5.24 dB over an imaging depth of 0.5 to 5.5 mm without software k-interpolation.
    • Maintained a maximum imaging depth of 5.8 mm.
    • Preserved a 4.2-µm Full Width at Half Maximum (FWHM) axial point spread function throughout the imaging depth.

    Conclusions:

    • Freeform optics enable the design of spectrometers with extremely low k-nonlinearity for SD-OCT.
    • The proposed freeform spectrometers significantly enhance SD-OCT imaging performance, including depth range and sensitivity.
    • Eliminating the need for post-k-interpolation simplifies processing and maintains image quality.