Related Experiment Video
Updated: May 31, 2026
10:42
Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Strong infrared radiation through passive dispersive wave generation and its control
Samudra Roy1, Debashri Ghosh, Shyamal K Bhadra
1Graduate School of Information Science & Technology, Hokkaido University, Sapporo 060-0814, Japan.
Applied Optics
|July 12, 2011
Summary
Researchers generated strong infrared radiation using passive dispersive wave generation in microstructured fibers. Adjusting the input pulse and operational wavelength controls the radiation frequency and amplitude, offering a potential alternative to infrared lasers.
Area of Science:
- Nonlinear optics
- Fiber optics
- Laser physics
Background:
- Microstructured fibers support unique nonlinear optical phenomena due to their engineered dispersion properties.
- Dispersive wave generation is a key mechanism for frequency conversion in optical fibers.
Purpose of the Study:
- To investigate strong infrared radiation generation via passive dispersive wave generation.
- To explore control over IR radiation frequency and amplitude in microstructured fibers.
- To assess the potential of this phenomenon as an alternative to traditional IR lasers.
Main Methods:
- Utilizing a realistic microstructured fiber with two zero-dispersion wavelengths.
- Employing passive dispersive wave generation.
- Controlling the operational wavelength within the normal dispersion regime.
- Introducing chirp to the input pulse to enhance radiation amplitude.
Main Results:
- Observed strong infrared radiation emission.
- Demonstrated tunability of IR radiation frequency by altering the operational wavelength.
- Showed significant amplitude enhancement of IR radiation by applying input pulse chirp.
- Achieved strong phase-matching conditions for the generated radiation.
Conclusions:
- Passive dispersive wave generation in microstructured fibers is an effective method for producing strong IR radiation.
- The generated IR radiation is tunable in frequency and can be amplified by chirping the input pulse.
- This technique presents a viable alternative to conventional IR lasers for diverse applications.
Related Concept Videos
01:25IR 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...
01:09Infrared (IR) Spectroscopy: Overview
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
01:24The Electromagnetic Spectrum
Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
01:19IR Spectrum
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
01:10Generating Electromagnetic Radiations
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
00:55IR Spectrum Peak Intensity: Amount of IR-Active Bonds
When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with varying...