An ultraviolet photon-counting dual-comb spectrometer. Two ultraviolet frequency combs of slightly different pulse repetition frequencies are generated at very low light levels by nonlinear frequency ...

A Caltech team has developed a highly efficient method to provide coherent light of any wavelength from visible to mid-infrared with a single tiny device ...

A study led by Politecnico di Milano, recently published in Nature Photonics, highlights the crucial role of virtual charges ...

Some typical structural and functional changes occur in the eyes, especially the eye fundus, due to ocular diseases like diabetic retinopathy (DR), age-related macular degeneration (AMD), and glaucoma ...

How do plants breathe? When do they open and close the tiny pores on their leaves, and what does this mean for their water ...

Why is Diffuse Reflectance Spectroscopy Used? One of the main techniques for evaluating the optical properties of materials is optical absorption spectroscopy, or UV-vis spectroscopy. Most absorption ...

Complex Biosystems Spectroscopic detection of fluorescent molecules, either those found naturally or those colored with fluorescent dyes, has created new research possibilities for scientists who ...

At the core of the breakthrough is an optical parametric oscillator (OPO), a resonator that converts incoming laser light into new frequencies using a nonlinear crystal. For decades, OPOs have been ...

Two-photon absorption and quantum light spectroscopy have emerged as transformative tools in modern optical research. At the heart of these techniques is the simultaneous absorption of two photons to ...

The process that can convert pollution into benign by-products is called selective catalytic reduction, or SCR. Until now, it has been unclear how this reaction actually occurs, and contradictions ...

"Spectroscopy and theory shed light on excitons in semiconductors." ScienceDaily. www.sciencedaily.com / releases / 2024 / 03 / 240319122940.htm (accessed September 26, 2025).