Raman spectrometer | Laser Focus World

Raman spectrometer

The Raman Systems R-2000 can be used for reaction monitoring, product identification, remote sensing, and characterization of highly scattering particles in aqueous solutions, gels, or other media. The system includes a 500-mW solid-state laser, a 2048-element miniature CCD array sensitive from 785 to 1000 nm, software, and an ISA-bus A/D card for interfacing with a PC.

Ocean Optics, Dunedin, FL

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To create a gold grating on a nanowire array (a), the nanowires themselves (vertical projections) were used as shadow masks by depositing the gold at an angle to the surface, resulting in undeposited areas (dark regions). Future nanowire-based separate absorption and multiplication avalanche photodiodes (SAM-APDs) will have faceted nanowires to help relieve lattice-mismatch strain (b).

Short- and mid-wavelength infrared nanowire photodiodes are uncooled

Nanowires of InAs and InAsSb on an indium phosphide substrate form room-temperature SWIR or MWIR photodiodes suitable for focal-plane arrays.

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Metasurface lens on diamond single-photon quantum source efficiently collects photons

A nitrogen-vacancy (NV) diamond produces single photons; a metalens etched into its surface collects them, no microscope needed.

On-chip laser-based quantum device generates true random numbers

A photonic integrated circuit containing two laser diodes whose outputs are interfered and measured produces truly random numbers at gigahertz rates.

Fiber sensing

FIGURE 1. The transparent zebrafish embryo enables paired patch clamp measurements of spinal neurons and locomotory muscle cells. Two chevron-shaped repetitive segments of tail muscle are shown. The two patch clamp recording electrodes are shown for an individual motoneuron and muscle cell. Only one electrode is visible in the field because placement of the electrodes during formation of whole-cell recording mode is done under very high magnification.

Neuroscience/Bioimaging: Optomechanics reveals transmitter roles in neuromuscular junctions

A clever optomechanical setup enables researchers to use patch clamp, Ca2+ imaging, and optogenetics to elucidate the roles of various neurotransmitters and correlate them with known genetic-defect diseases in humans.

A diagram shows NIST’s ion trap used for reversible “quantum squeezing” to amplify and measure ion motion. The ion (white ball) is confined 30 microns above the trap surface by voltages applied to the eight gold electrodes and the two red electrodes. Squeezing--that reduces the uncertainty of motion measurements--is achieved by applying a specific signal to the red electrodes. The ion is moved by applying another type of signal to one of the gold electrodes. Then the squeezing is reversed, and the blue electrodes generate magnetic fields used to decode the amplified motion measurements.

NIST quantum squeezing and amplification technique advances quantum computing

NIST’s rapid, reversible squeezing method could speed up operations in a quantum computer.

LASER World of PHOTONICS 2019: Inspiring

The depth and diversity of photonics technologies and products on display is an exciting reminder of the pivotal role of the world’s leading photonics tradeshow.

$A nonperiodic pinhole-based photon sieve widens the display angle of a lensless digital dynamic holographic display produced by a liquid-crystal-based spatial light modulator (SLM). At top, a dynamic holographic display without the nonperiodic photon sieve has a narrow viewing angle. At bottom, a holographic display with the nonperiodic photon sieve, which diffracts light at a high angle, has a larger viewing angle. The pinhole array in the sieve is made nonperiodic to avoid creating periodic arrays of diffraction artifacts. The researchers note that the holographic objects to be displayed need to appear within the shaded regions to prevent clipping.$

Pinhole-based ‘photon sieve’ widens viewing angle of dynamic holographic displays

Ultralow-threshold polariton nanolaser operates at room temperature

MKS Instruments reveals CEO succession plan

MKS is pleased to welcome John Lee as Chief Executive Officer and believes that he will lead MKS to a bright future.

Light emission resulting from a mutual annihilation of electrons and holes is the operating principle of semiconductor lasers. (Image credit: Elena Khavina/MIPT)

MIPT says Weyl semimetals are the perfect laser gain media

In this 'wonder material', radiative recombination dominates over Auger recombination.

Graphene can now exhibit luminescence. (Image credit: University of Cordoba)

Luminescence now added to the long list of useful graphene attributes

Europium is a metal that perfectly coordinates with modified molecules of graphene and grants it luminous properties.

Large-scale simulations demonstrate that chaos is responsible for stochastic heating of dense plasma by intense laser energy. This image shows a snapshot of electron distribution phase space (position/momentum) from the dense plasma taken from PIC simulations, illustrating the so-called 'stretching and folding' mechanism responsible for the emergence of chaos in physical systems. (Image credit: G. Blaclard/CEA Saclay)

New simulation tools improve understanding of laser/plasma coupling interactions

Understanding of these mechanisms is critical to the development of ultracompact particle accelerators and light sources.

Synopsys and photonics industry leaders partner to advance PIC technology with plasmonics

Three-year project PLASMOfab advanced PICs and CMOS-compatible plasmonics for optical data communications and biosensing.