Quantum Cascade Laser
Quantum Cascade Laser - Related Videos
02:43
Quantum Numbers
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2020
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels. The energy levels are labeled with an n value, where n = 1, 2, 3, etc. Generally speaking, the energy of an electron in an atom is greater for greater values of n. This number, n, is referred to as the principal quantum number. The principal quantum number defines the...
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
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Cited by 2 •
2013
The gradient echo memory is a protocol for storing optical quantum states of light in atomic ensembles. Quantum memory is a key element of a quantum repeater, which can extend the range of quantum key distribution. We outline the operation of the scheme when implemented in a 3-level atomic ensemble.
01:25
Rab Cascades
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2023
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
02:45
The Quantum-Mechanical Model of an Atom
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2020
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
12:19
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Cited by 2 •
2017
Silicon photonic chips have the potential to realize complex integrated quantum systems. Presented here is a method for preparing and testing a silicon photonic chip for quantum measurements.
FAQs
The repeated quantum-well stages permit one electron to contribute to multiple emission events. At each intersubband transition, the electron emits a photon while continuing toward later stages. This cascading arrangement increases the use made of an electron and supports radiation at selected wavelengths, which is central to Quantum Cascade Laser spectroscopy and sensing.
Quantum Cascade Lasers differ from conventional diode lasers through the type and arrangement of electronic transitions used for emission. Their engineered quantum-well stages enable repeated intersubband transitions as electrons cascade through the device. This distinction provides compact, tunable mid- or far-infrared radiation, a useful range for spectroscopy and sensing of molecular signatures.
Wavelength selectivity allows a Quantum Cascade Laser to target radiation at selected spectral regions, while rapid modulation enables measurements to change quickly. In medical research, these properties can help compare molecular signatures across tissues, breath, or biological fluids and may support compact sensing systems as well as biomolecular studies.
Medical spectroscopy with a Quantum Cascade Laser can examine tissues, breath, or biological fluids for molecular signatures. In practice, the instrument supplies wavelength-selective infrared radiation and records the sample's spectroscopic response for analysis. This approach may support disease detection, diagnostic analysis, or noninvasive monitoring, depending on the sample and measurement design.
The medical applications described for Quantum Cascade Lasers include measurements involving tissues, breath, and biological fluids. These sample categories are relevant because infrared spectroscopy can probe their molecular signatures. Comparing the resulting information may contribute to disease detection or diagnostic analysis, while measurements performed without invasive sampling may support noninvasive monitoring.
Their compact form, tunable radiation, and rapid modulation make Quantum Cascade Lasers relevant to portable clinical instruments. Such systems could apply infrared spectroscopy to diagnostic analysis or monitoring outside larger laboratory platforms. The same capabilities also support biomolecular studies, linking instrument development with research on molecular signatures in biological materials.