Quantum cascade lasers (QCLs) represent a class of unipolar semiconductor lasers that generate mid-infrared and terahertz radiation through intersubband transitions in multi-quantum-well structures.

A new, miniature laser source developed by applied physicists in the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) and the Technical University of Vienna (TU Wien) could ...

Dual-comb spectroscopy uses paired ultrafast laser frequency combs to identify molecules by their spectral fingerprints, enabling broad scientific and sensing applications.

Optical frequency combs are specially designed lasers that act like rulers to accurately and rapidly measure specific frequencies of light. They can be used to detect and identify chemicals and ...

"Compared to previous acoustic frequency combs, our phonon-laser comb features phonon lasing, a record-high number of teeth, tunable spacing, and a broad bandwidth spanning the low-frequency audible ...

The trick to creating a better quantum sensor? Just give it a little squeeze. For the first time ever, scientists have used a technique called “quantum squeezing” to improve the gas sensing ...

There are significantly different architectures for what are known as “atomic” clocks. Optically driven atomic clocks offer a new set of performance attributes. The optical atomic clocks use paired ...

Researchers developed a new type of spectral shaper that can shape the spectrum of 10,000 lines of light from a laser frequency comb. The image shows the spatial light modulator they used with a 2D ...

Very-long baseline interferometry (VLBI) is a technique in radio astronomy whereby multiple radio telescopes cooperate to bundle their received data and in effect create a much larger singular radio ...

The ultrabroadband infrared frequency comb could be used for chemical detection in portable spectrometers or high-resolution remote sensors. (Nanowerk News) Optical frequency combs are specially ...

The reported phonon-laser frequency comb incorporates an ultrathin silicon nitride (SiN) membrane, coupled to an optical cavity. Circulating laser light exerts radiation pressure on the membrane, ...