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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

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

Mach-Zehnder interferometer using frequency-domain beamsplitter.

Toshiki Kobayashi, Daisuke Yamazaki, Kenichiro Matsuki

|August 10, 2017

Summary

This summary is machine-generated.

Researchers demonstrated first-order interference of light using a novel frequency-domain Mach-Zehnder interferometer (MZI). This setup shows high visibility, paving the way for quantum information processing applications.

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Last Updated: Feb 25, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Area of Science:

Quantum optics
Nonlinear optics
Integrated photonics

Background:

Mach-Zehnder interferometers (MZIs) are fundamental tools in optics.
Frequency-domain operations offer new possibilities for photonic devices.
Quantum information processing requires high-fidelity interference and low background noise.

Purpose of the Study:

To demonstrate first-order interference between coherent light at 1580 nm and 795 nm.
To implement a frequency-domain Mach-Zehnder interferometer (MZI) using nonlinear optical effects.
To assess the feasibility of this MZI for quantum information processing.

Main Methods:

Utilized a frequency-domain Mach-Zehnder interferometer (MZI).
Employed two frequency-domain beam splitters (BSs) based on second-order nonlinear optical effects in a periodically-poled lithium niobate waveguide.
Used a strong pump light to drive the nonlinear process.
Measured interference visibility and conversion efficiencies.
Evaluated background photon rates using a superconducting single photon detector (SSPD).

Main Results:

Achieved first-order interference between 1580 nm and 795 nm light.
Observed interference visibility exceeding 0.99.
Attained 50% conversion efficiencies for the frequency-domain beam splitters.
Demonstrated low background photon rates suitable for quantum applications.

Conclusions:

The frequency-domain MZI is a viable platform for high-visibility quantum interference.
The demonstrated technology shows potential for advancing photonic quantum information processing.
Practical settings allow for single photon interference with visibility above 0.9.