Probing semiconductor crystals with a sphere of light

Tohoku University researchers have developed a technique using a hollow sphere to measure the electronic and optical properties of large semiconducting crystals. The approach, published in the journal Applied Physics Express, ...

Using diamonds to recharge civilian drones in flight

A small lab-grown diamond measuring a few millimeters per side could one day enable civilian drones to be recharged in mid-flight through a laser. Thanks to the diamond, the laser beam can remain strong enough over a long ...

Inexpensive chip-based device may transform spectrometry

Spectrometers—devices that distinguish different wavelengths of light and are used to determine the chemical composition of everything from laboratory materials to distant stars—are large devices with six-figure price ...

Calibrating an optical attenuator with few-photon pulses

Precise measurements of optical power enable activities from fiber-optic communications to laser manufacturing and biomedical imaging—anything requiring a reliable source of light. This situation calls for light-measuring ...

Building a more versatile frequency comb

Frequency combs are the rulers of light. By counting a wavelength's many oscillations, they measure distance and time with extraordinary precision and speed.

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