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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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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Ultra-high dynamic range electro-optic sampling for detecting millimeter and sub-millimeter radiation.

Akram Ibrahim1, Denis Férachou1, Gargi Sharma2

  • 1INRS-EMT, Advanced Laser Light Source, Université du Québec, 1650 boul. Lionel- Boulet, Varennes J3X 1S2, Québec, Canada.

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We developed a new terahertz radiation detection method using cross-polarized spectral-domain interferometry. This technique achieves an ultra-high dynamic range, enabling advanced spectroscopy of challenging materials.

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Area of Science:

  • Physics
  • Spectroscopy
  • Optics

Background:

  • Coherent terahertz (THz) radiation applications are growing due to advances in generation and detection.
  • Current THz detection methods often lack the dynamic range needed for comparing strong and weak signals.

Purpose of the Study:

  • To introduce and validate a novel technique for ultra-high dynamic range electro-optic sampling of THz radiation.
  • To overcome limitations in dynamic range for advanced THz spectroscopy experiments.

Main Methods:

  • Utilized cross-polarized spectral-domain interferometry.
  • Exploited birefringence in a single-mode polarization-maintaining fiber.
  • Measured phase changes induced by the THz electric field in a detection crystal.

Main Results:

  • Achieved a dynamic range of 7 × 10^6, four orders of magnitude higher than conventional methods.
  • Maintained a comparable signal-to-noise ratio to existing techniques.
  • Demonstrated a novel approach for ultra-high dynamic range THz electro-optic sampling.

Conclusions:

  • The developed technique significantly enhances dynamic range for THz measurements.
  • This method is crucial for linear spectroscopy of optically thick samples and nonlinear THz spectroscopy.
  • The advancement promises to broaden the scope of THz time-domain spectroscopy applications.