Related Experiment Video
Updated: Dec 10, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.5K
Electro-optic frequency combs generated via direct digital synthesis applied to sub-Doppler spectroscopy.
David A Long1, Benjamin J Reschovsky1
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
OSA Continuum
|August 29, 2020
Summary
Researchers generated low-frequency optical frequency combs for probing atomic transitions. This method achieved high precision in measuring atomic properties, offering a cost-effective alternative to expensive equipment.
Area of Science:
- Atomic Physics
- Quantum Optics
- Spectroscopy
Background:
- Optical frequency combs are crucial for high-precision measurements.
- Traditional methods for generating narrow-linewidth combs can be complex and expensive.
Purpose of the Study:
- To develop a cost-effective method for generating low-frequency optical frequency combs.
- To utilize these combs for probing atomic transitions, specifically electromagnetically induced transparency (EIT) in potassium vapor.
- To demonstrate long-term coherent averaging and precise measurement of atomic properties.
Main Methods:
- Direct digital synthesis coupled with an electro-optic phase modulator to create optical frequency combs with 100 Hz tooth spacing.
- Probing potassium vapor cells using these combs to study electromagnetically induced transparency (EIT) and hyperfine pumping.
- Employing long-term coherent averaging for enhanced signal-to-noise ratio.
Main Results:
- Successfully generated optical frequency combs with tooth spacings as low as 100 Hz.
- Determined the ground state hyperfine splitting of potassium with a fit uncertainty of 80 Hz.
- Demonstrated performance comparable to expensive arbitrary waveform generators through coherent averaging.
Conclusions:
- Direct digital synthesis offers a powerful and economical approach to generating optical frequency combs for atomic spectroscopy.
- The mutual coherence of the generated beams enables the observation of sub-laser-linewidth features in a multiplexed manner.
- This technique eliminates the need for slow scanning methods, advancing precision atomic measurements.
Related Concept Videos
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
2.4K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.4K
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
1.4K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.4K
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
508
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
508
01:05Doppler Effect - II
4.2K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
4.2K
01:21IR Absorption Frequency: Hybridization
1.1K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.1K
01:24IR Spectroscopy: Molecular Vibration Overview
4.1K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
4.1K