Related Experiment Video
Updated: Jan 6, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.6K
Gain-through-filtering enables tuneable frequency comb generation in passive optical resonators
Florent Bessin1, Auro M Perego2, Kestutis Staliunas3,4
1University of Lille, CNRS, UMR 8523-PhLAM Physique des Lasers Atomes et Molécules, F-59000, Lille, France.
Nature Communications
|October 5, 2019
Summary
Researchers developed a new method for generating tunable optical frequency combs (OFCs) using driven passive optical resonators. This technique offers frequency-agile OFCs without requiring specific resonator dispersion engineering.
Area of Science:
- Photonics and Optical Engineering
- Quantum Metrology
- Spectroscopy
Background:
- Optical frequency combs (OFCs) are crucial for precision spectroscopy and metrology.
- Applications of OFCs span chemistry, biology, astrophysics, and LIDAR systems.
- Driven passive optical resonators offer a compact and energy-efficient platform for OFC generation.
Purpose of the Study:
- To propose a novel technique for generating OFCs with a tunable repetition rate.
- To demonstrate a method for creating frequency-agile OFCs in driven optical resonators.
Main Methods:
- Utilizing a gain-through-filtering process in externally driven optical resonators.
- Employing asymmetric spectral filtering on one side of the pump wave.
- Experimental proof-of-concept in a fiber resonator.
Main Results:
- Successful generation of OFCs with a tunable repetition rate.
- Demonstration of a new technique for frequency-agile OFCs.
- The method does not require specific engineering of resonator dispersion.
Conclusions:
- A simple and elegant method for generating tunable OFCs has been demonstrated.
- This technique enables frequency-agile OFCs in a compact resonator platform.
- Pioneers a new approach for OFC generation without dispersion engineering.
Related Concept Videos
01:27Passive Filters
930
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
930
01:25Active Filters
1.2K
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
1.2K
01:23Parallel Resonance
489
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
489
01:17Bandpass Sampling
453
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
453
01:26Scaling
518
In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
518
01:24Characteristics of Series Resonant Circuit
531
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
531