Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"frequency stabilization"”.
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Frequency stabilization of an optical FDM system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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Laser Frequency Stabilization With Pound-Drever-Hall Technique
Laser frequency stabilization is important in laser science and various researches requiring laser beams with high frequency precision. However, the changes in physical parameters of the lasers themselves and in the external environments often cause instability in the output frequency of the laser. …
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Frequency stabilization for a 486nm dye-ring laser
… towards using two reference cavities to provide frequency stabilization to a 486nm dye-ring laser. After a doubling cavity doubles the frequency to 243nm, the laser beam is used to excite ground state hydrogen to the 2S state: the first step of an experiment to accurately measure the 2S-NS …
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Frequency stability of a helium neon laser system with external cavity control
… spectral purity requires a high degree of frequency stabilization and laser mode control. In the past few years much effort has been expended in attempts to devise and test various methods of frequency stabilization. This investigation lists a number of these methods employed over the past …
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Calibration and Control of Superconducting Qubits for Low‑Overhead Quantum Error Correction
… calibration graphs. We introduce real‑time frequency stabilization techniques, demonstrating improved single‑qubit gate fidelities and progress toward multiqubit feedback. Finally, we explore how quantum error correction overhead can be reduced using low‑density parity‑check codes. We …
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Towards Large-Scale Integrated Electronic-Photonic Systems
… challenges and limitations of laser phase and frequency stabilization systems have been discussed and two novel integrated electronic-photonic architectures have been co-designed, implemented, and successfully demonstrated to address those challenges. We demonstrated the first integrated …
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A Narrow-Linewidth Laser at 1550 nm Using the Pound-Drever-Hall Stabilization Technique
Linewidth is a measure of the frequency stability of any kind of oscillator, and it is a defining characteristic of coherent lasers. Narrow linewidth laser technology, particularly in the field of fiber-based infrared lasers, has progressed to the point where highly stable sources are commercially …
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Theoretical and experimental studies of optically pumped molecular gas lasers
… concerning temperature spectral tuning and frequency stabilization of a Nd:YAG laser that pumped HBr were accomplished. Lasing at 4 microns was demonstrated from such a system. We identified acetylene and hydrogen cyanide as potential laser gases that can be pumped with lasers emitting in …
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Ultrasensitive Force Sensing with Nanospheres in an Optical Standing Wave Trap
… wave trap. In this thesis we outline the frequency stabilization system, the optical cavity, and experimental progress in overlapping both optical standing wave traps. We will outline further improvements that can and are being made to improve the system. Also included is an outline of our …
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Coherent manipulations of trapped 88Sr+ using the 4D5/2 --> 5S1/2 transition
… experiments. This thesis describes the frequency stabilization of a laser which is used to coherently manipulate both the internal electronic state and quantum harmonic motion of a trapped 88Sr+ ion via its 4D5/2 <--> 5S1/2 transition. The laser is locked with a linewidth on the order of …
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On-Chip Atomic Spectroscopy
… and single-photon nonlinearities, as well as frequency stabilization standards. The use of hollow waveguides allows for light propagation in low index (vapor) media with compact mode areas. ARROWs make particularly attractive waveguides for this purpose because they can be interfaced with …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
Current portable near-infrared optical frequency references offer modest accuracy and instability compared to laboratory references. Low pressure reference cells are necessary to realize features narrower than the Doppler broadened overtone transitions, and most setups to date have occurred in …
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Design Technique for Analog Temperature Compensation of Crystal Oscillators
… the quartz crystal has been used for precise frequency control. In the increasingly popular field of wireless communications, available frequency spectrum is becoming very limited, and therefore regulatory agencies have imposed tight frequency stability requirements. There are generally two …
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Semiconductor-generated entangled photons for hybrid quantum networks
… allow for reversible fine-tuning of the emission frequency. In a next step, active feedback is employed to stabilize the frequency of single photons emitted by two separate quantum dots to an atomic rubidium standard. The transmission of a rubidium-based Faraday filter serves as the error signal …
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Integrated Wavelength Stabilization Of Broad Area Semiconductor Lasers Using A Dual Grating Reflector
A new fully integrated wavelength stabilization scheme based on grating-coupled surface-emitting lasers is explored. This wavelength stabilization scheme relies on two gratings. The first grating is fabricated on the p-side of the semiconductor laser in close proximity to the laser waveguide such …