Robotics

Wielding a laser beam deep inside the body

Minimally invasive surgeries in which surgeons gain access to internal tissues through natural orifices or small external excisions are common practice in medicine. They are performed for problems as diverse as delivering ...

Robotics

Robot reminds Japan shoppers to wear masks

Asking someone to put on a mask is a touchy subject, so one shop in Japan has enlisted a robot to make sure its customers wear them during the pandemic.

Computer Sciences

Creating 3-D maps of complex buildings for disaster management

In case of an emergency, first responders like the fire brigade need up-to-date information. Two-dimensional maps are a common source of information, but they can be difficult to read in an emergency situation. UT Ph.D. student ...

Engineering

Device tracks house appliances through vibration, AI

To boost efficiency in typical households—where people forget to take wet clothes out of washing machines, retrieve hot food from microwaves and turn off dripping faucets—Cornell University researchers have developed ...

Robotics

Microscopic robots 'walk' thanks to laser tech

A Cornell University-led collaboration has created the first microscopic robots that incorporate semiconductor components, allowing them to be controlled—and made to walk—with standard electronic signals.

Engineering

Laser inversion enables multi-materials 3-D printing

Additive manufacturing—or 3-D printing—uses digital manufacturing processes to fabricate components that are light, strong, and require no special tooling to produce. Over the past decade, the field has experienced staggering ...

page 1 from 5

Laser

A laser is a device that emits light (electromagnetic radiation) through a process called stimulated emission. The term laser is an acronym for light amplification by stimulated emission of radiation. Laser light is usually spatially coherent, which means that the light either is emitted in a narrow, low-divergence beam, or can be converted into one with the help of optical components such as lenses. Typically, lasers are thought of as emitting light with a narrow wavelength spectrum ("monochromatic" light). This is not true of all lasers, however: some emit light with a broad spectrum, while others emit light at multiple distinct wavelengths simultaneously. The coherence of typical laser emission is distinctive. Most other light sources emit incoherent light, which has a phase that varies randomly with time and position.

This text uses material from Wikipedia, licensed under CC BY-SA