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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...

Infrared (IR) Spectroscopy: Overview

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Atomic Emission Spectroscopy: Instrumentation

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Fluorescence and Phosphorescence: Instrumentation

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Related Experiment Video

Updated: Oct 19, 2025

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

Core-shell NaErF₄@NaYF₄ upconversion nanoparticles qualify as a NIR speckle wavemeter for a visible CCD.

Tianliang Wang¹, Yi Li¹, Long Yan²

¹College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China. yli@cjlu.edu.cn.

|September 21, 2021

Summary

This study introduces a compact, low-cost near-infrared (NIR) wavemeter using a novel scattering waveguide and a convolutional neural network (CNN). The device achieves ultra-high wavelength precision for laser measurements.

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

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Area of Science:

Optics and Photonics
Materials Science
Machine Learning

Background:

Speckle patterns are used for precise monochromatic light wavelength determination.
Existing optical diffusing waveguides face challenges in balancing cost, compactness, precision, and stability.

Purpose of the Study:

To design a compact, cost-effective, and high-precision near-infrared (NIR) wavemeter.
To overcome the imaging limitations of visible cameras in the NIR range.

Main Methods:

Developed a compact cylindrical random scattering waveguide (CRSW) using TiO2 particles and UV adhesive.
Integrated upconversion nanoparticles (UCNPs) to convert NIR to visible light.
Designed a convolution neural network (CNN) for wavelength recognition from speckle patterns.

Main Results:

Achieved high wavelength precision of 20 kHz (∼0.16 fm) at 1550 nm.
Demonstrated good temperature stability with resistance to ±2 °C.
The CRSW-UCNP system effectively converts NIR to visible light for imaging.

Conclusions:

The developed NIR wavemeter is low-cost, compact, and simple.
It offers ultra-high wavelength precision and good temperature stability.
Significant potential for high-speed and high-precision laser wavelength measurements.