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Enhanced Static Modulated Fourier Transform Spectrometer for Fast Approximation in Field Application.

Ju Yong Cho1, Won Chun Oh2, Won Kweon Jang1

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This study introduces a rapid static modulated Fourier transform spectrometer for real-time field use. The device accurately measures spectral properties of InGaAs LEDs, showing minimal deviation from conventional methods.

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Semiconductor Physics

Background:

  • Fourier transform spectrometers are crucial for spectral analysis.
  • Conventional methods can be limited by measurement time and complexity.
  • Static modulated interferometers offer potential for faster, real-time measurements.

Purpose of the Study:

  • To present a static modulated Fourier transform spectrometer based on a modified Sagnac interferometer.
  • To evaluate its performance in terms of data sampling frequency, spectral resolution, and non-aliasing limits.
  • To investigate the spectral properties of an Indium Gallium Arsenide (InGaAs) light-emitting diode (LED) using the developed spectrometer.

Main Methods:

  • Utilized a modified Sagnac interferometer for static modulation.
  • Performed measurements within a rapid 4 ms timeframe for real-time applicability.
  • Analyzed spectral peak shift and broadening of an InGaAs LED under varying temperature and current.

Main Results:

  • The spectrometer achieved high accuracy, with spectral width deviation <10% and spectral peak shift difference <2% compared to conventional Fourier transform spectrometers.
  • Observed a spectral peak shift from 6420 cm⁻¹ to 6365 cm⁻¹ as temperature increased from 25 °C to 40 °C at a fixed current of 0.55 A.
  • Demonstrated spectral broadening from 316 cm⁻¹ to 384 cm⁻¹ as operating current increased from 0.30 A to 0.55 A at room temperature.

Conclusions:

  • The static modulated Fourier transform spectrometer is suitable for real-time field operations due to its rapid 4 ms measurement capability.
  • The device accurately characterizes spectral properties of InGaAs LEDs, showing temperature and current dependencies.
  • This technology offers a viable, high-performance alternative to conventional Fourier transform spectrometers for specific applications.