Implementing compact, efficient, and reliable passive pulsed lasers at visible wavelengths is attractive. This paper systematically investigated the thickness-dependent optical absorption characteristics of two-dimensional materials, including graphene, transition-metal dichalcogenides, dye films 532 nm wavelength band, revealed effects thickness on different parameters. The results suggested t...

The adult compound eyes of passion-vine butterflies in the genus Heliconius contain one more UV opsin than other butterflies. Together with an 11-cis-3-hydroxyretinal chromophore, their four opsin genes UVRh1, UVRh2, BRh, and LWRh produce four rhodopsins that are UV-, blue-, or long wavelength absorbing. One of the Heliconius UV opsin genes, UVRh2, was found to have evolved under positive selec...

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We propose and demonstrate a high-performance wavelength-switchable erbium-doped fiber laser (EDFL), enabled by figure-8 compound-ring-cavity (F8-CRC) filter for single-longitudinal-mode (SLM) selection polarization-managed four-channel (PM-FCF) defining four lasing wavelengths. introduce novel methodology utilizing signal-flow graph combined with Mason’s rule to analyze CRC in general apply it...

Pharmaceutical and biotechnology research requires instrumentation to be both functional and versatile. In the HTS and Drug Discovery environments, microplate-based assays are developed to make determinations on large numbers of samples. Regardless of the assay protocol, the end result is the measurement by some sort of detection device. Towards that end, BioTek has developed Synergy HT Multi-D...

This paper addresses the physical layer design of flexible optical networks [1–8] and its interplay with the routing layer. In such circuit-switched dispersion uncompensated (DU) fiber-optic networks, wavelength division multiplexed (WDM) dual polarization (DP) optical digital signals are transmitted and coherently detected. Each fiber carries at most W wavelengths with possibly mixed modulatio...

We demonstrate the feasibility of uncovering supermassive black holes in late-type, “quiescent” spiral galaxies by detecting signs of very low-level nuclear activity. We use a combination of x-ray selection and multi-wavelength follow-up. Here, we apply this technique to NGC 3184 and NGC 5457, both of type Scd, and show that strong arguments can be made that both host AGNs.

Integrated Al2O3:Er 3+ channel waveguide ring lasers were realized on thermally oxidized silicon substrates. High pump power coupling intoand low output power coupling fromthe ring is achieved in a straightforward design. Wavelength selection in the range 1532 to 1557 nm was demonstrated by varying the length of the output coupler from the ring. Keywords—waveguide laser; ring laser; erbium-dope...

The main objective of this study is to develop a near-infrared (NIR) tunable external cavity laser (ECL) that is based on a semiconductor optical amplifier and two different wavelength selective elements. In order to achieve the wavelength selection, several filters have been tested in the ECL setups, including plasmonic filter, acoustooptic tunable filter (AOTF), gradient photonic crystal and ...

Diffuse optical imaging (DOI) is finding widespread application in the study of human brain activation. However, the process of wavelength selection is unclear and may lead to choices that negatively affect the accuracy and reliability of the data. This thesis describes a method to empirically determine the combination of four nearinfrared (NIR) wavelengths that yields the best images of functi...