Multimedia / Photo Contest / 2018
Ytterbium doped fiber laser
Ytterbium doped fiber laser

Ytterbium doped fiber laser operating at >600W. A splice protecting sleeve has been used as a cigar in the image and handheld red laser pointer was used to create eyes, nose and cigar fire.

—Balaswamy Velpula, Nonlinear Photonics and High Power Lasers Laboratory, Indian Institute of Science, Bengaluru, India

20 Nov 2018

Multiple reflections of a laser
Multiple reflections of a laser

Multiple reflections of a green laser travelling through a VIPA etalon in a Brillouin spectrometer. The resulting interference pattern allows to resolve color differences in the picometer scale, hundred times smaller than the size of an atom.

—Antonio Fiore, University of Maryland

20 Nov 2018

Propagation of plane wave
Propagation of plane wave

Propagation of plane wave

—Areli Montes-Perez, Benemérita Universidad Autónoma de Puebla

20 Nov 2018

A lidar beam
A lidar beam

A lidar beam used in a step-stare scan mode for studying insects paints a green pattern over the night sky at Teton National Park during a Montana State University field experiment in July 2018.

—Joseph A. Shaw, Montana State University

20 Nov 2018

A 22-degree halo
A 22-degree halo

A 22-degree halo struggles to be noticed above the busy streets of San Francisco, California.

—Joseph A. Shaw, Montana State University, U.S.A.

20 Nov 2018

Refraction and reflection
Refraction and reflection

A rainbow created by refraction and reflection in tiny glass beads glued to a poster board reminds us that rainbows are actually full circles.

—Joseph A. Shaw, Montana State University, U.S.A.

20 Nov 2018

Colored light
Colored light

A field near Yellowstone Park appears to be watered by colored light.

—Joseph A. Shaw, Montana State University, U.S.A.

20 Nov 2018

White light emitted from a smartphone screen
White light emitted from a smartphone screen

White light emitted from the small dots of a high-resolution smartphone screen experiments double refraction and color-selective absorption depending on its polarization (dichroism) when incident on a piece of colorless calcite (Iceland spar). These effects are the basis of many applications, from the nineteenth-century dichroscope commonly used in geology and gemology, to current spectroscopic techniques employed to characterize the structure of proteins.

—Emilio Gomez-Gonzalez, Engineering School, Universidad de Sevilla, Spain

20 Nov 2018

Innovative lighting systems
Innovative lighting systems

Novel white phosphorescent materials are key elements for innovative lighting systems to replace contaminant, inefficient luminaries. Diode-based technologies are evolving from complex arrangements of red, green and blue emitters to thermally-stable, white-light emitting semiconductors. Blue emission from a conventional diode is partially converted into yellow light and the resulting combination generates the desired white light. The material remains transparent to red and greenish colors.

—Emilio Gomez-Gonzalez, Engineering School, Universidad de Sevilla, Spain

20 Nov 2018

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