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 ...

Physicists are teasing a potential leap in nuclear fusion that sounds almost absurd on its face: a path to reactions that are “billion times” more efficient by swapping today’s ultra-short, ...

Ultrafast lasers emit pulses lasting only a few hundred femtoseconds (quadrillionths of a second). These flashes of light ...

Carbon monoxide lasers are unique gas-dynamic devices that emit a dense forest of rotational–vibrational lines in the mid-infrared region, typically between 4.5 µm and 7 µm. These systems exploit a CO ...

For experiments that require ultra-precise measurements and control over atoms — think two-photon atomic clocks, cold-atom interferometer sensors and quantum gates — lasers are the technology of ...

Acoustic frequency combs organize sound or mechanical vibrations into a series of evenly spaced frequencies, much like the teeth on a comb. They are the acoustic counterparts of optical frequency ...

Single-frequency fiber lasers deliver coherent radiation at a single longitudinal mode with exceptionally narrow spectral linewidths. These devices employ rare-earth-doped fibers—most commonly erbium ...

Illustration of a racetrack laser operating under radio-frequency injection. The RF 'wave' radiates throughout the chip and generates multiple frequency-locked tones which circulate the racetrack.