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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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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Dynamic range beyond 100 dB for polarization mode coupling measurement based on white light interferometer.

Chuang Li, Jun Yang, Zhangjun Yu

|July 28, 2016

Summary

This study enhances white light interferometer (WLI) systems for polarization mode coupling (PMC) measurements, overcoming noise limitations to achieve over 100 dB dynamic range for ultra-high polarization extinction ratio (PER) device testing.

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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments

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Published on: February 27, 2013

Area of Science:

Optoelectronics
Interferometry
Photonics

Background:

White light interferometry (WLI) is crucial for optical measurements.
Polarization mode coupling (PMC) systems face dynamic range limitations due to interference beat noise.
Accurate measurement of ultra-high polarization extinction ratio (PER) is vital for advanced polarization devices.

Purpose of the Study:

To develop a novel method for significantly improving the dynamic range of WLI-based PMC measurement systems.
To overcome the inherent noise limitations affecting detection sensitivity in high-PER measurements.
To enable precise characterization of polarization devices requiring ultra-high PER.

Main Methods:

Detailed analysis of inherent noises impacting detection sensitivity in WLI systems.
Development of an improved PMC measurement system and methodology.
Implementation of techniques to eliminate interference beat noise and enhance interference intensity.

Main Results:

Demonstrated dynamic range improvement beyond 100 dB for PMC measurements.
Successfully tested a LiNbO3 Y-junction with ~80 dB PER, showing clear and stable interferogram identification.
Achieved a standard deviation of 0.9 dB (3σ) for high PER measurements, validating the method's precision.

Conclusions:

The proposed method effectively eliminates interference beat noise, enhancing WLI system performance.
This advancement significantly benefits the fabrication and evaluation of polarization devices with ultra-high PER.
The technique provides a robust solution for testing weak signals in high-PER optical components.