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IR Spectrometers

IR Spectrometers

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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Related Experiment Video

Updated: Feb 25, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Dual-wavelength highly-sensitive refractive index sensor.

Shun Wang, Shuhui Liu, Wenjun Ni

|August 10, 2017

Summary

This summary is machine-generated.

A novel dual-wavelength fiber laser sensor offers highly sensitive refractive index (RI) detection. This sensor utilizes gain competition for precise environmental monitoring in chemical and biochemical applications.

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Last Updated: Feb 25, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Area of Science:

Photonics and Optical Sensing
Fiber Optic Sensors
Laser Technology

Background:

Refractive index (RI) sensing is crucial for various analytical applications.
Existing RI sensors may face limitations in sensitivity, stability, or complexity.
Fiber optic sensors offer advantages like remote sensing and immunity to electromagnetic interference.

Purpose of the Study:

To develop and demonstrate a highly sensitive refractive index sensor.
To investigate the performance of a dual-wavelength fiber laser for RI sensing.
To explore the application of gain competition in fiber laser sensors.

Main Methods:

Utilized a linear-cavity dual-wavelength erbium-doped fiber laser (DWEDFL).
Employed two fiber Bragg gratings (FBGs) with closely spaced wavelengths.
Introduced optical loss by immersing a microfiber (MF) sensing component in solutions of varying RI.
Analyzed the optical spectrum changes and power variations at the two FBG wavelengths.

Main Results:

Achieved high sensitivities of -231.1 dB/RIU and 42.6 dB/RIU in the RI range of 1.300 to 1.335.
Demonstrated enhanced sensitivity of -273.7 dB/RIU with improved stability by monitoring relative power changes.
Observed RI-dependent spectral variations due to gain competition between the two lasing wavelengths.

Conclusions:

The developed DWEDFL RI sensor exhibits high sensitivity and a simple structure.
The dual-wavelength gain competition mechanism provides a robust sensing approach.
Potential applications exist in sensitive chemical and biochemical detection.