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