scholarly journals High-frequency cavity optomechanics using bulk acoustic phonons

2019 ◽  
Vol 5 (4) ◽  
pp. eaav0582 ◽  
Author(s):  
Prashanta Kharel ◽  
Glen I. Harris ◽  
Eric A. Kittlaus ◽  
William H. Renninger ◽  
Nils T. Otterstrom ◽  
...  
Keyword(s):  
Ground State ◽  
High Frequency ◽  
Optical Cavity ◽  
Parametric Instability ◽  
Phonon Modes ◽  
Power Laser ◽  
Quantum Operations ◽  
Cavity Modes ◽  
Laser Oscillators ◽  
Bulk Phonon

To date, microscale and nanoscale optomechanical systems have enabled many proof-of-principle quantum operations through access to high-frequency (gigahertz) phonon modes that are readily cooled to their thermal ground state. However, minuscule amounts of absorbed light produce excessive heating that can jeopardize robust ground-state operation within these microstructures. In contrast, we demonstrate an alternative strategy for accessing high-frequency (13 GHz) phonons within macroscopic systems (centimeter scale) using phase-matched Brillouin interactions between two distinct optical cavity modes. Counterintuitively, we show that these macroscopic systems, with motional masses that are 1 million to 100 million times larger than those of microscale counterparts, offer a complementary path toward robust ground-state operation. We perform both optomechanically induced amplification/transparency measurements and demonstrate parametric instability of bulk phonon modes. This is an important step toward using these beam splitter and two-mode squeezing interactions within bulk acoustic systems for applications ranging from quantum memories and microwave-to-optical conversion to high-power laser oscillators.

Rotational Analysis of the lΠ–XlΣ+ System of C80Se

1974 ◽  
Vol 52 (9) ◽  
pp. 813-820 ◽  
Author(s):  
René Stringat ◽  
Jean-Paul Bacci ◽  
Marie-Hélène Pischedda
Keyword(s):  
Emission Spectrum ◽  
Ground State ◽  
High Frequency ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
High Frequency Discharge ◽  
Perturbed State ◽  
Simple Evaluation ◽  
Π State

The strongly perturbed 1Π–X1Σ+ system of C80Se has been observed in the emission spectrum of a high frequency discharge through selenium and carbon traces in a neon atmosphere. The analysis of five bands yields, for the molecular constants of the ground state, the values Be″ = 0.5750 cm−1, [Formula: see text], αe″ = 0.00379 cm−1, re″ = 1.676 Å, ΔG″(1/2) = 1025.64 cm−1, and ΔG″(3/2) = 1015.92 cm−1. The numerous perturbations in the 1Π state prohibit the simple evaluation of the constants of the perturbed state and of the perturbing ones.

scholarly journals Opto-Mechanical Inertial Sensors (OMIS) for High Temporal Resolution Gravimetry

2020 ◽  
Author(s):  
Lee Kumanchik ◽  
Felipe Guzman ◽  
Claus Braxmaier
Keyword(s):  
High Frequency ◽  
High Stability ◽  
Vibration Isolation ◽  
Inertial Sensors ◽  
Response Times ◽  
Free Spectral Range ◽  
Optical Cavity ◽  
Fused Silica ◽  
High Temporal Resolution ◽  
Free Falling

<p>Gravity field measurement by free-falling atoms has the potential for very high stability<br>over time as the measurement exposes a direct, fundamental relationship between mass<br>and acceleration. However, the measurement rate of the current state-of-the-art limits<br>the performance at short timescales (greater than 1 Hz). Classical inertial sensors operate<br>at much faster response times and are thus natural companions for free-falling atom<br>sensors. Such a hybrid device would gain the ultra-high stability of the free-falling atom<br>sensor while greatly extending the bandwidth to higher frequency using the classical<br>sensor. This requires the stable bandwidth of both devices to overlap sufficiently. We<br>have developed opto-mechanical inertial sensors (OMIS) with good long term stability for<br>just this purpose. The sensors are made of highly stable fused silica material, feature a<br>monolithic optical cavity for displacement readout, and utilize a laser diode stabilized to<br>a molecular reference. With no temperature control and only the thermal shielding<br>provided by the vacuum chamber, this device is stable down to 0.1 Hz which overlaps<br>with the bandwidth of free-falling atom sensors. The OMIS are self-calibrating by<br>converting the fundamental resonances of a molecular gas into length using the<br>free-spectral range of the optical cavity,  <em>FSR = c/2nL</em>,  and then sampling the OMIS<br>mechanical damping rate and resonance frequency using a nearby piezo. This<br>acceleration calibration is potentially transferable to a companion free-falling atom<br>sensor. Readout is performed by modulating the cavity length of the OMIS with one<br>cavity mirror being the OMIS itself and the other being a high frequency resonator. The<br>high frequency resonator is driven by a nearby piezo well above the response rate of the<br>OMIS and acts like an ultrastable quartz clock. The resulting highly stable tone is<br>demodulated by the readout electronics. For the low finesse optical cavity used here, this<br>yields a displacement resolution of 2x10<sup>-13</sup> m/√Hz and a high frequency acceleration<br>resolution of 400 n<em>g</em> /√Hz. At 0.1 Hz the acceleration resolution is 1.5 μ<em>g</em> /√Hz limited by<br>the stability of our vibration isolation stage. The OMIS dimensions are about 30 mm x 30<br>mm x 5 mm and can be fiber coupled to enable co-location with other sensors or as<br>standalone devices for future gravimetry both on Earth and in space</p>

scholarly journals lntersubband Relaxation in Step Quantum Well Structures

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 289-293
Author(s):  
J. P. Sun ◽  
H. B. Teng ◽  
G. I. Haddad ◽  
M. A. Stroscio ◽  
G. J. Iafrate
Keyword(s):  
Quantum Well ◽  
Form Factors ◽  
Phonon Energy ◽  
Longitudinal Optical Phonon ◽  
Relaxation Rates ◽  
Phonon Modes ◽  
Quantum Well Structures ◽  
Bulk Phonon ◽  
Interface Phonons ◽  
Intersubband Relaxation

Intersubband relaxation due to electron interactions with the localized phonon modes plays an important role for population inversion in quantum well laser structures designed for intersubband lasers operating at mid-infrared to submillimeter wavelengths. In this work, intersubband relaxation rates between subbands in step quantum well structures are evaluated numerically using Fermi's golden rule, in which the localized phonon modes including the asymmetric interface modes, symmetric interface modes, and confined phonon modes and the electron – phonon interaction Hamiltonians are derived based on the macroscopic dielectric continuum model, whereas the electron wave functions are obtained by solving the Schrödinger equation for the heterostructures under investigation. The sum rule for the relationship between the form factors of the various localized phonon modes and the bulk phonon modes is examined and verified for these structures. The intersubband relaxation rates due to electron scattering by the asymmetric interface phonons, symmetric interface phonons, and confined phonons are calculated and compared with the relaxation rates calculated using the bulk phonon modes and the Fröhlich interaction Hamiltonian for step quantum well structures with subband separations of 36 meV and 50meV, corresponding to the bulk longitudinal optical phonon energy and interface phonon energy, respectively. Our results show that for preferential electron relaxation in intersubband laser structures, the effects of the localized phonon modes, especially the interface phonon modes, must be included for optimal design of these structures.

scholarly journals High speed electro-optical cavity dumping of mode-locked laser oscillators

2005 ◽  
Vol 13 (6) ◽  
pp. 1916 ◽  
Author(s):  
Alexander Killi ◽  
Jochen D�rring ◽  
Uwe Morgner ◽  
Max J. Lederer ◽  
J�rgen Frei ◽  
...  
Keyword(s):  
High Speed ◽  
Optical Cavity ◽  
Laser Oscillators ◽  
Mode Locked Laser

High-Frequency and High-Power Laser Modulator in Space Optical Communications

2010 ◽  
Vol 47 (12) ◽  
pp. 120604
Author(s):  
詹伟达 Zhan Weida ◽  
李洪祚 Li Hongzuo ◽  
王志坚 Wang Zhijian ◽  
姜会林 Jiang Huilin
Keyword(s):  
High Power ◽  
Optical Communications ◽  
High Frequency ◽  
High Power Laser ◽  
Power Laser

scholarly journals Helicity-Preserving Optical Cavity Modes for Enhanced Sensing of Chiral Molecules

2020 ◽  
Vol 124 (3) ◽  
Author(s):  
Joshua Feis ◽  
Dominik Beutel ◽  
Julian Köpfler ◽  
Xavier Garcia-Santiago ◽  
Carsten Rockstuhl ◽  
...  
Keyword(s):  
Optical Cavity ◽  
Chiral Molecules ◽  
Cavity Modes

scholarly journals Large ion Coulomb crystals: A near-ideal medium for coupling optical cavity modes to matter

2009 ◽  
Vol 80 (4) ◽  
Author(s):  
A. Dantan ◽  
M. Albert ◽  
J. P. Marler ◽  
P. F. Herskind ◽  
M. Drewsen
Keyword(s):  
Optical Cavity ◽  
Ideal Medium ◽  
Cavity Modes ◽  
Coulomb Crystals

scholarly journals Population inversion X-ray laser oscillator

2020 ◽  
Vol 117 (27) ◽  
pp. 15511-15516 ◽  
Author(s):  
Aliaksei Halavanau ◽  
Andrei Benediktovitch ◽  
Alberto A. Lutman ◽  
Daniel DePonte ◽  
Daniele Cocco ◽  
...  
Keyword(s):  
Photon Energy ◽  
Theoretical Study ◽  
Optical Cavity ◽  
Pulse Length ◽  
Copper Nitrate ◽  
Gain Medium ◽  
Metal Compounds ◽  
X Ray ◽  
Near Ultraviolet ◽  
Laser Oscillators

Oscillators are at the heart of optical lasers, providing stable, transform-limited pulses. Until now, laser oscillators have been available only in the infrared to visible and near-ultraviolet (UV) spectral region. In this paper, we present a study of an oscillator operating in the 5- to 12-keV photon-energy range. We show that, using theKα1line of transition metal compounds as the gain medium, an X-ray free-electron laser as a periodic pump, and a Bragg crystal optical cavity, it is possible to build X-ray oscillators producing intense, fully coherent, transform-limited pulses. As an example, we consider the case of a copper nitrate gain medium generating ∼ 5 ×1010photons per pulse with 37-fs pulse length and 48-meV spectral resolution at 8-keV photon energy. Our theoretical study and simulation of this system show that, because of the very large gain per pass, the oscillator saturates and reaches full coherence in four to six optical-cavity transits. We discuss the feasibility and design of the X-ray optical cavity and other parts of the oscillator needed for its realization, opening the way to extend X-ray–based research beyond current capabilities.

On the thermal ionization of trapped electrons in ionic solids

1955 ◽  
Vol 231 (1186) ◽  
pp. 308-320 ◽  
Keyword(s):  
Ground State ◽  
High Frequency ◽  
Ionic Crystal ◽  
Dielectric Constants ◽  
Variation Method ◽  
Lattice Vibrations ◽  
Appreciable Difference ◽  
Ionic Solids ◽  
Self Consistent ◽  
Consistent Method

The ground state of an electron trapped at a defect of the interstitial ion type in an ionic crystal is determined by a variation method in which the interaction between electron and lattice vibrations is treated on a dynamic basis. The results are com pared with static calculations using a self-consistent method, and it is shown that for certain ranges of the low- and high-frequency dielectric constants an appreciable difference in energy may occur.

Sign in / Sign up

Export Citation Format

Share Document