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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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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Spectropolarimetric interferometer based on single-mode glass waveguides.

Zhi-Mei Qi¹, Shanhong Xia, Naoki Matsuda

¹State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, No. 19 Beisihuan West Road, Beijing, 100080, China. zhimei-qi@mail.ie.ac.cn

|June 11, 2008

Summary

This summary is machine-generated.

A new spectropolarimetric interferometer uses potassium ion-exchanged (PIE) glass waveguides to measure modal birefringence. This device accurately determines wavelength dependence and detects small refractive index changes in evanescent fields.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Single-mode waveguides are crucial for optical devices.
Potassium ion-exchanged (PIE) glass exhibits significant birefringence due to induced stress.

Purpose of the Study:

To develop a simple spectropolarimetric interferometer.
To accurately measure the wavelength dependence of modal birefringence in PIE waveguides.
To demonstrate the sensor's responsiveness to refractive index changes.

Main Methods:

Development of a novel spectropolarimetric interferometer.
Utilizing single-mode PIE glass waveguides.
Spectropolarimetric interferometry to analyze modal birefringence over a broad bandwidth.

Main Results:

Accurate measurement of wavelength dependence of modal birefringence in PIE waveguides.
Observed decrease in modal birefringence with increasing wavelength.
Demonstrated sensitivity to refractive index changes within the evanescent field penetration depth.
Detection of a refractive index change of 0.002 with a 2-cm interaction length.

Conclusions:

The developed spectropolarimetric interferometer is effective for characterizing PIE waveguides.
The technique allows for broad bandwidth analysis of modal birefringence without individual modal index measurement.
The interferometer shows promise as a sensor for detecting small refractive index variations.