External Cavity Diode Laser for investigating a potential Erbium/h-BN Qubit Source
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Date
2024-05
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Publisher
The Ohio State University
Abstract
Erbium atoms deposited on hexagonal Boron-Nitride (h-BN) show promise as an unexplored implementation of quantum bits (qubits). Fluorescence spectroscopy will be needed to identify the deposited Erbium atoms and to characterize the similarity of found transitions to those of free space Erbium. Transitions of wavelength in the range of 390 nm to 410 nm are of interest - as such, a laser of continuously tunable wavelength spanning as much of this range as possible is desired. The proposed solution is to construct an External Cavity Diode Laser (ECDL). An ECDL uses a grating, which diffracts light at an angle related to wavelength, to produce stimulated emission within a laser diode of extremely precise linewidth. Adjusting the optical setup of an ECDL results in wavelength selection. Conveniently, blue-ray diode lasers produce a nominal wavelength of 405 nm and therefore can be used as a low-cost diode for an ECDL in the wavelength range of interest. Utilizing feedback, temperature, and current control, the ECDL ensures continuous wavelength tuning from 399.6 nm to 403.7 nm with a single mode output power as great as 8.7 mW and a linewidth no greater than 60 pm.
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Keywords
External Cavity Diode Laser, Atomic, molecular, and optical physics, Physics, ECDL, Quantum Information Science