A single quantum-dot (QD) laser diode developed by a group at the University of Dundee generates stable dual and/or multiple longitudinal modes in the near-infrared.
Researchers have unveiled the smallest room-temperature CW lasers operating at telecommunications wavelengths ever produced—and they operate with practically no lasing threshold...
I was flattered when Conard Holton asked me to give the keynote at the Lasers & Photonics Marketplace Seminar at Photonics West. Given that the meeting was to be attended by 125...
Researchers at the University of Texas at Austin have "cloaked" a macroscopic object in free space from detection in three dimensions at all viewing angles for the first time....
March 2, 2012
(Courtesy of the Joint Non-Lethal Weapons Program)
Nonlethal laser weapons are going big time. After testing green laser “dazzlers” at checkpoints in Afghanistan and Iraq, the US Army in November 2011 ordered thousands more “Green...
Laser-induced ultrasonic emission, converted to imagery, enables deep-tissue views of mechanisms in organs, cells, subcellular structures, and even biochemicals—without labels...
No single technology solves the problem of imaging through turbulent atmosphere, but combining adaptive optics, real-time adaptation of system parameters, multiplexed imaging,...
A new atomic-force microscopy (AFM) quantitative imaging (QI) mode is not a product, but a new methodology that makes it easier to image difficult samples without the need for...
Thanks to military night vision advances, small-pore microchannel plates result in faster photomultipliers that compete directly with streak cameras in terms of dynamic range ...
By ablating small amounts of material at a time, picosecond and femtosecond lasers can cleanly machine brittle glasses and ceramics, as well as performing other delicate operations...
A supercontinuum laser based on an erbium/ytterbium power amplifier emits over approximately 0.8–4.2 μm, while a second version based on a thulium-doped power amplifier covers...
Acronyms have been used to simplify communications for thousands of years—the official name for the Roman Republic, and then Empire, was SPQR (Senatus Populusque Romanus). Today...
![FIGURE 1. Photoacoustic microscopy provides anatomical, chemical, and dynamic imaging. Using 584 nm light to image a mouse ear bearing a xenotransplanted B16 melanoma tumor (white-dashed box in [a]), this image reveals a principal artery-vein pair (magenta-dashed box in [a]) that feeds and drains the tumor region. In this image, depth is color-coded: blue (superficial) to red (deep). For comparison to traditional microscopy, see the white-light photograph of the mouse ear (b), which is shown at lower resolution. Photoacoustic technology can also reveal melanin (c), and here the blood vessels are invisible due to the weak absorption of hemoglobin at the wavelength used. For examples of dynamic imaging, see the photoacoustic images of oxygen saturation in the principal arterial-vein pair revealed with dual-wavelengths excitation at 584 and 594 nm (d) and flow velocity imaging of the principal arterial-vein pair (e). The arrows show the directions of positive and negative flow, and pulsing is even visible.](https://img.laserfocusworld.com/files/base/ebm/lfw/image/2016/01/1203lfw_fea1_fig1.png?auto=format,compress&fit=fill&pad=5&fill-color=white&q=45&h=139&height=139&w=250&width=250 "FIGURE 1. Photoacoustic microscopy provides anatomical, chemical, and dynamic imaging. Using 584 nm light to image a mouse ear bearing a xenotransplanted B16 melanoma tumor (white-dashed box in [a]), this image reveals a principal artery-vein pair (magenta-dashed box in [a]) that feeds and drains the tumor region. In this image, depth is color-coded: blue (superficial) to red (deep). For comparison to traditional microscopy, see the white-light photograph of the mouse ear (b), which is shown at lower resolution. Photoacoustic technology can also reveal melanin (c), and here the blood vessels are invisible due to the weak absorption of hemoglobin at the wavelength used. For examples of dynamic imaging, see the photoacoustic images of oxygen saturation in the principal arterial-vein pair revealed with dual-wavelengths excitation at 584 and 594 nm (d) and flow velocity imaging of the principal arterial-vein pair (e). The arrows show the directions of positive and negative flow, and pulsing is even visible.")
