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Related Experiment Video

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Two-photon absorption spectrometers for near infrared.

Itzel Reyna-Morales1, Jesús Garduño-Mejía1, Israel Rocha-Mendoza2

  • 1Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Coyoacán, 04510 CDMX, Mexico.

The Review of Scientific Instruments
|May 4, 2023
PubMed
Summary

This study introduces a cost-effective Silicon-based Charge-Coupled Device (Si-CCD) sensor as a spectrometer for characterizing femtosecond pulses in the Near Infrared region. It achieves a resolution of 0.6 nm using nonlinear Two-Photon Absorption.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Materials Science

Background:

  • Femtosecond pulse characterization is crucial for advanced optical applications.
  • Existing spectrometers can be expensive and complex.
  • Silicon-based Charge-Coupled Device (Si-CCD) sensors offer potential for cost-effective optical measurements.

Purpose of the Study:

  • To develop and evaluate a cost-effective spectrometer for femtosecond pulse characterization in the Near Infrared (NIR) region.
  • To investigate the performance of a Silicon-based Charge-Coupled Device (Si-CCD) sensor in two different spectrometer configurations.
  • To analyze the nonlinear response of the Si-CCD sensor for spectroscopic applications.

Main Methods:

  • Utilized a Silicon-based Charge-Coupled Device (Si-CCD) sensor as the core detection element.
  • Implemented two spectrometer configurations: two-Fourier and Czerny-Turner setups.
  • Employed femtosecond lasers (Optical Parametric Oscillator and Erbium-Doped Fiber Amplifier) for testing in the 1100-1700 nm range.
  • Leveraged the Two-Photon Absorption (TPA) effect within the Si-CCD for nonlinear spectral detection.

Main Results:

  • Achieved a spectral resolution of 0.6 ± 0.1 nm.
  • Determined a threshold peak intensity of 2×10^6 W/cm^2 for nonlinear operation.
  • Characterized the nonlinear response as a function of wavelength and analyzed saturation effects.

Conclusions:

  • The Si-CCD sensor demonstrates viability as a cost-effective spectrometer for NIR femtosecond pulse characterization.
  • The Two-Photon Absorption mechanism in Si-CCD enables nonlinear spectroscopy with good resolution.
  • Understanding nonlinear response and saturation is key for optimizing spectrometer performance.