We report the optical architecture, experimental performance, and simulated performance of polarization- maintaining CW and pulsed single clad Tm-doped fiber amplifiers designed to operate over a wavelength span of 1760—1960 nm. We highlight the potential applications of these amplifiers to quantum computing and quantum qubit experiments using 1762 nm light. Our amplifier exhibits 3 W CW output power and 20 W peak pulsed output power (2 MHz rep. rate, 10% duty cycle) at 1762 nm. Measurements of the wavelength response of the TDFA yield an experimental operating bandwidth extending from < 1750 nm to > 1920 nm. Simulations of the amplifier bandwidth indicate a 3 dB (50% FWHM) wavelength span of 1745 nm to 1980 nm (135 nm). Experimental output power and bandwidth results agree well with the simulations. The external noise figure for this amplifier ranges from 7.5 dB to 9.5 dB. No linewidth broadening was observed in a typical TDFA output when using a single frequency input laser source with a linewidth of 10 kHz. We discuss suitability and applications of the TDFA to 1762 nm enabled manipulation of optical qubits in trapped 133Ba+ ions.
We report the results of gamma radiation testing of the performance of 1064 nm packaged butterfly single mode DFB lasers (QD Laser QLD1061) for satellite and space applications. Both passive and active tests were conducted, with measurements of output power, optical signal-to-noise-ratio (OSNR), output spectra, and polarization extinction ratio (PER) as a function of dose rates and total radiation exposure. No significant changes in laser behavior were observed for total doses up to 100 kRad.
A noticeable repositioning of the characteristic photoluminescence peaks of homogeneous colloidal quantum dot solutions has been observed upon producing heterogeneous combinations of previously synthesized quantum dots. Typically, the wavelength of an emission peak is described as a fermionic property solely dependent on the size and the chemical composition of the nanoparticles involved. However, the experimental observations indicate that quantum dot interactions produce surface energy variations that trigger the aforementioned repositioning of photoluminescence emission peaks, and could represent an alternative route for controlling other fermionic properties such as melting temperature, ferromagnetic properties, cohesive energy, activation energy of diffusion and vacancy formation energy. Therefore, the extensive characterization of quantum dot interactions for tailoring and controlling fermionic properties could enable the demonstration of novel nanomaterials with unique properties for a variety of optoelectronic, photovoltaic and biomedical applications.
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