Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

3.1K
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...
3.1K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

2.1K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
2.1K
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

11.0K
Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
11.0K
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

1.9K
Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
1.9K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

1.5K
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
1.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Conservative port-to-port funneling of light in nonlinear photonic lattices.

Nature communications·2025
Same author

Fluctuation Statistics of Nonlinear Optical Microcanonical Systems.

Physical review letters·2025
Same author

Photon-photon chemical thermodynamics of frequency conversion processes in highly multimode systems.

Light, science & applications·2025
Same author

Selective filtering of photonic quantum entanglement via anti-parity-time symmetry.

Science (New York, N.Y.)·2025
Same author

Fundamental mode excitation via Joule-Thomson light expansion in nonlinear optical lattices.

Optics letters·2025
Same author

Publisher Correction: Guiding charged particles in vacuum via Lagrange points.

Nature communications·2024

Related Experiment Video

Updated: May 3, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

12.1K

Coupled distributed feedback laser system at 820 nm for THz beat-frequency generation.

Yuzhou G N Liu, Jongheon Lee, Mercedeh Khajavikhan

    Optics Letters
    |August 2, 2024
    PubMed
    Summary

    We developed a dual-mode distributed feedback (DFB) laser using AlGaAs/GaAs, enabling simultaneous lasing at two frequencies. This semiconductor laser offers simplified fabrication and potential beat frequency tunability for advanced applications.

    More Related Videos

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    11.5K
    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    8.9K

    Related Experiment Videos

    Last Updated: May 3, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
    09:38

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

    12.1K
    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    11.5K
    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    8.9K

    Area of Science:

    • Semiconductor Physics
    • Optoelectronics
    • Photonics

    Background:

    • Distributed feedback (DFB) lasers are crucial for wavelength-specific light generation.
    • Dual-mode operation in DFB lasers allows for beat frequency generation, useful in sensing and communications.
    • AlGaAs/GaAs heterostructures are widely used in high-performance semiconductor devices.

    Purpose of the Study:

    • To present a novel coupled DFB laser system capable of simultaneous dual-mode operation.
    • To demonstrate dual-mode lasing with specific wavelength spacing and beat frequency.
    • To highlight the advantages of the new design, including simplified fabrication and potential tunability.

    Main Methods:

    • Epitaxial growth of AlGaAs/GaAs compound semiconductor.
    • Design of a DFB laser system supporting two lateral modes sharing a Bragg grating.
    • Characterization of electroluminescence, lasing modes, wavelength spacing, beat frequency, and output power.

    Main Results:

    • Achieved electroluminescence near 820 nm.
    • Demonstrated simultaneous dual-mode lasing operation.
    • Recorded a 4.2 nm wavelength spacing, corresponding to a 1.86 THz beat frequency.
    • Obtained an output power of 14.7 mW at 195 mA injection current.

    Conclusions:

    • The presented coupled DFB laser system successfully achieves dual-mode operation.
    • The design offers simplified fabrication compared to previous dual-mode DFB lasers.
    • The system shows potential for beat frequency tunability and compatibility with LT-GaAs photodetectors.