Laser systems, as physical systems, comprise an optical gain medium, an energy pump source, and an optical resonator configured to produce coherent, monochromatic, and highly directional electromagnetic radiation via stimulated emission. The gain medium (solid-state, gas, liquid, or semiconductor) is excited by optical, electrical, or chemical pumping, creating a population inversion between quantized energy levels. The resonator, typically a pair of mirrors or integrated waveguide structures, provides optical feedback and mode selection, defining spatial and spectral properties. System performance is characterized by thresholds, efficiency, beam quality (M²), temporal regime (CW or pulsed), and stability against thermal, mechanical, and nonlinear optical effects.
Light still holds surprises—as demonstrated by researchers from the Ultrafast Phenomena Lab at the Faculty of Physics, University of Warsaw, in collaboration with the Institute of Low Temperature and Structure Research, the ...
Nanophysics
Aug 29, 2025
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In Tenerife, Spain, stands a unique duo: ESA's Izaña-1 and Izaña-2 laser-ranging stations. Together, they form an optical technology testbed of the European Space Agency that takes the monitoring of space debris and satellites ...
Space Exploration
Aug 28, 2025
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30
From precision machining to advanced microscopy, the demand for higher-power, ultrafast lasers continues to grow. Traditionally, researchers have relied on single-mode fibers to build these lasers, but they face a fundamental ...
For years, engineers have sought better ways to build tiny, efficient lasers that can be integrated directly onto silicon chips, a key step toward faster, more capable optical communications and computing.
Optics & Photonics
Aug 20, 2025
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127
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 pollutants with extremely high ...
Optics & Photonics
Aug 20, 2025
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174
Imagine a whirlpool spinning in a river, or a tornado swirling through the sky. They don't just spin on the spot: they travel forward while maintaining that spiraling motion inside them. These twisting motions, called vortices, ...
Optics & Photonics
Aug 19, 2025
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An international team of scientists led by Nanyang Technological University, Singapore (NTU Singapore) has developed a new type of ultracompact laser that is more energy efficient and consumes less power.
Optics & Photonics
Aug 14, 2025
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81
A team led by scientists at the Department of Energy's SLAC National Accelerator Laboratory have generated a highly exotic type of light beam, called a Poincaré beam, using the FERMI free-electron laser (FEL) facility in ...
Optics & Photonics
Aug 14, 2025
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90
With a suite of reimagined instruments at SLAC's LCLS facility, researchers see massive improvement in data quality and take up scientific inquiries that were out of reach just one year ago.
General Physics
Aug 8, 2025
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67
A team of physicists has discovered a method to temporarily halt the ultrafast melting of silicon using a carefully timed sequence of laser pulses. This finding opens new possibilities for controlling material behavior under ...
General Physics
Aug 7, 2025
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90
