Image of the Week

Laser cavity

Ti:Sapphire femtosecond laser cavity in the lab.

—Hemang Jani, University of Alabama in Huntsville

17 Sep 2018

$Diffraction from Sand$

Diffraction from Sand

Diffraction of light beam from sand in beam, causing loss of image clarity. [Taken from the 2009 OPN Photo Contest]

—Larry A. Donoso

10 Sep 2018

Beam Shaping ... and Unshaping

A long exposure of the experimental setup used to measure the reduction of group velocity of structured light by shaping then unshaping one beam with respect to another and interfering the two. Glasgow University, UK

—Kevin J. Mitchell, University of Glasgow

03 Sep 2018

Lasing of IR laser diode

The wide-field image of a GaAs oxide-confined vertical-cavity surface-emitting laser (VCSEL) diode lasing is obtained by applying a current of 0.8 mA.

—Subir Das, Institute of Biophotonics, National Yang-Ming University, Taipei, 11221, Taiwan

27 Aug 2018

Saturable Absorber

Mirrored image of a liquid dye-jet saturable absorber inside a Ti:sapphire ring laser. (This photo was taken in the laboratory of Dr. Jean-Claude Diels at the University of New Mexico, and the system is the thesis project of Ph.D. candidate James Hendrie.)

—Carolina Bucheli, University of New Mexico

20 Aug 2018

“Blood Moon”

The longest total lunar eclipse of the 21st century—103 min (161%)—occurred on 27 July 2018, giving rise to the “blood moon” effect captured here. The picture was taken on the Feldberg, the highest mountain of the Black Forest in Germany.

—Dan Curticapean, Offenburg University

13 Aug 2018

Optics Arrangement

A beautiful optics arrangement by a visitor at the University of Oulu chapter OSA booth.

—Prateek Singh, University of Oulu

06 Aug 2018

Light Trace

Light trace at St. Pauli Night Market, Hamburg.

—Özgür Önder Karakilinç, Pamukkale University

30 Jul 2018

$Diffractive analysis$

Diffractive analysis

Diffractive analysis of the spectrum of two white LED tube lamps by a CD

—Samuel Pellicori, OSA Senior Member

23 Jul 2018

FEM simulation

FEM simulation (COMSOL) of higher modes confined in a two-photon patterned Ormocer waveguide on top of a Cytop substrate immersed in water. Waveguide geometry was measured with an atomic force microscope.

—Frederik Hasselman, Institute of Applied Physics, Nonlinear Photonics, Muenster University

16 Jul 2018

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