MWIR Camera Lens – Infrared Optics with Low Distortion

MWIR camera lens are a family of midwave infrared lenses specifically designed to operate in the 3-5 ?m wavelenght region with InSb FPA Focal Plane Arrays. The lenses offer a bayonet standard interface or, alternatively, they can be equipped with a custom mount interface at no additional cost.

In the design of the lenses, great importance was attached to a good image quality and a large aperture (small F-number).

These lenses, mounted on a MWIR camera lens, are the perfect choice for a variety of applications, including imaging through fog, high-speed thermal imaging, thermography, R&D (MWIR range), non-destructive testing.

This article comes from stemmer-imaging edit released

Photon amplification, emission observed in plastic scintillation materials

A research team has observed, in polystyrene-based scintillation materials, photon amplification and emission that cannot be explained with the established scintillation mechanism. Photon yield from the polystyrene-based scintillation materials was found to increase in accordance with a power-law of concentration of fluorescent molecules doped in polystyrene.

The results of this research can have a variety of applications such as environmental background radiation / radiation measurements and elementary particle / atomic nucleus experiments, and it requires new interpretations of the scintillation mechanism in plastic scintillation materials, which are expected to have further applications in the future. It is also expected to help to develop high performance radiation detectors.

The results of this research were published in Applied Physics Letters, the weekly journal of the American Institute of Physics, on December 28, 2012.

Plastic scintillation materials made by doping fluorescent molecules to plastics have been used in a wide variety of applications in order to obtain high sensitivity in detecting radiation. The scintillation mechanism of these materials was established in the middle of 20th century and it is explained with the so-called “ladder”, in which ultra violet light emitted from plastics by radiation is converted stepwise into visible light by fluorescent molecules. This means that fluorescent molecules whose absorption wavelength overlaps with the emission wavelengths of plastics are required in making plastic scintillation materials.

In order to develop high performance plastic scintillation materials, the team focused on polystyrene, which emits ultra violet light when exposed to ionizing radiation. In a departure from the established prerequisites, para-terphenyl was used as fluorescent molecule despite the fact that its absorption wavelength has a small overlap with the emission wavelength of polystyrene.

In the established scintillation mechanism, light emitted from plastics should be absorbed by fluorescent molecules and the light should be attenuated every time when it is re-emitted. In addition, when the relation between emission wavelength of polystyrene and absorption wavelength para-terphenyl is taken into account, photon yield emitted from polystyrene-based scintillation materials should be smaller than photon yield emitted from polystyrene having no fluorescent molecules added.

However, the photon yield emitted from the polystyrene-based scintillation materials is found to be more than that from polystyrene having no fluorescent molecules added. In other words, the birth of new luminescence was shown. Furthermore, it is clearly shown that photon yield from the scintillation material increases in accordance with a power-law of fluorescent molecule concentration (which is changed to the maximum of 5-orders). These phenomena cannot be explained with the present scintillation mechanism of plastic scintillation materials and requires new interpretations.

The product of this research will lead the way to the improved performance of radiation detectors which use a plastic scintillation material is used for such applications as natural environmental radiation / radiation measurements and elementary particle / atomic nucleus experiments.

This article comes from phys edit released

Lithium Tantalate Wafers

Lithium Tantalate Wafers (LT/LiTaO3) has been recognized as an ideal substrate material for the RF surface acoustic wave (SAW) filter, a key component within wireless communication devices as mobile phones. Its stability and size make it the preferred option among other piezoelectric materials.

Lithium Tantalate Wafers exhibits unique electro-optical, pyroelectric and piezoelectric properties combined with good mechanical and chemical stability and , wide transparency range and high optical damage threshold. This makes LiTaO3 well-suited for numerous applications including electro-optical modulators, pyroelectric detectors, optical waveguide and SAW substrates, piezoelectric transducers etc.

Lithium tantalate Wafers (LiTaO3), has properties which make it useful for SAW (surface acoustic wave) devices and, to a different specification, for optical use. Wafers can be produced with varying properties, such as “black” wafers free of pyroelectric discharge, 4″ (100mm), orientation 36°, 39°, 42 °, 46°, 48°, X-CUT detailed specifications, or with higher physical strength to withstand processing during manufacture, resulting in higher yields.

This article comes from roditi edit released

Round Thin Film Laser Polarizers

Thin Film Laser Polarizers separate the s- and p-polarization components. They are designed for use in high energy lasers. Due to high damage threshold, reaching 10 J/cm2 @ 1064 nm 8 ns, Thin Film Laser Polarizers are used as an alternative to Glan Laser Polarizing Prisms or Cube Polarizing Beamsplitters.

Typical applications are intracavity Q-switch hold-off polarizer or extracavity attenuator for Nd:YAG lasers.

Thin Film Laser Polarizers can be used at an > 40° angle of incidence, but polarization is most efficient and appears in a broad wavelength range at 56° AOI (Brewster angle). Typical polarization ratio Tp/Ts is 200:1.

Standard size is up to Ø50 mm (2”), while max. available dimensions are 100×200 mm. For optimal transmission a Thin Film Polarizer should be mounted in an appropriate holder for angular adjustment.

This article comes from eksmaoptics edit released

Infrared Optics Lenses with Large Field of View

Opto Engineering LWIR is a family of longwave infrared Optical lenses specifically designed to operate in the 8-14 µm wavelenght region with uncooled detectors (a-si, vOx). The infrared Optical lenses can be equipped with any custom mount interface at no additional cost.

In the design of the infrared Optical lenses, great importance was attached to a good image quality and a large aperture (small F-number).

These infrared Optical lenses, mounted on an uncooled LWIR camera are the perfect choice for a variety of applications spanning from industrial to military, including temperature measurement for process quality control and monitoring, predictive maintenance, imaging through smoke and fog, medical imaging.

This article comes from stemmer-imaging edit released

A Small-Animal PET System Based on LYSO Crystal Arrays

A positron emission tomography system for small animals has been designed for research purposes, and developed at Instituto de Fisica, UNAM, Mexico. Its detection modules are based on pixelated scintillator LYSO crystal arrays coupled to Hamamatsu H8500 position-sensitive photomultiplier tubes.

The front-end electronics are based on nuclear instrumentation modules (NIM) and in-house built readout circuits. Peak signal digitization is performed with a commercial analogue-to-digital acquisition (DAQ) board. The system has been characterized for spatial, timing and energy resolution, system dead time, absolute sensitivity, scatter fraction and noise equivalent count rate (NEC).

The results indicate that the detection modules are able to identify individual crystals (out of 400) with up to 8-to-1 peak-to-valley ratios with individual crystal energy resolution ranging from 7 to 15% at 511 keV. The timing resolution is 1.9 ns and the system dead time was found to be 16.8 s and 42.1 s for 0.5 ml and 10 ml volume sources, respectively. The measured absolute system sensitivity is 0.11% and the scatter fraction from a glass capillary inside a 2.5 cm diameter mouse phantom is 21.5%. A true NEC maximum value was not achieved with the system due to saturation of the PS-PMT output signals for activities above 0.27 mCi. Results from a Na18 F PET bone scan of a 30 g mouse are shown.

This article comes from ieeexplore edit released