I am looking for a BaF2 viewport that contains a Flange (prefer O-ring
stainless flange) and a BaF2 window (at least 2" view diameter, preferably
larger). This viewport is for a gaseous chamber (maybe 1-2 atm pressure) and I
would like to view inside from the port with a IR camera. Could you please let
me know if you have any product that meet my needs?
Vacuum viewport
Del Mar Photonics offer a range of competitively priced UHV viewports ,
Conflat, ISO or KF including a variety of coatings to enhance performance.
Del Mar Photonics viewports are manufactured using advanced techniques for
control of special and critical processes, including 100 percent helium leak
testing and x-ray measurements for metallization control. Windows Materials
include: Fused silica, Quartz , Sapphire , MgF2, BaF2, CaF2, ZnSe, ZnS, Ge,
Si, Pyrex. Standard Viewing diameters from .55" to 1.94 ".
Coating - a range of custom coatings can applied - which include
- Single QWOT
- Broad Band AR
- V coatings
- ITO
- DLC (Diamond like coating)
Del Mar Photonics offer a range of competitively priced UHV viewports , Conflat,
ISO or KF including a variety of coatings to enhance performance.
When you send us your inquiry please
fill out
the following form to indicate all important specifications and
e-mail it
to us with your inquiry.
Del Mar Photonics viewports are manufactured using advanced techniques for control of special and critical
processes, including 100 percent helium leak testing and x-ray measurements for
metallization control.
Research: Micro and Nano Technology
Honors and Awards
Fellow, IEEE (Institute of Electrical and Electronics Engineers), 2010
Willett Faculty Scholar Award, College of Engineering, University of Illinois,
2005-2009
Faculty Associate, Center for Advanced Studies, University of Illinois
Xerox Award for Faculty Research, College of Engineering, University of
Illinois, 2004
UIUC Incomplete List of Teachers Ranked as Excellent, Fall 2001
National Science Foundation, CAREER Award for young investigators, 2000
Ou-You Yi Award, 1996
Research
Chang Liu's research group conducts interdisciplinary research at the interface
of mechanical engineering, electrical engineering, biology, and materials. Our
group's primary research expertise and endeavors lie in the following areas:
microfabrication technology, nanofabrication, bioinspired sensors, and smart
integrated systems.
Our group develops novel and efficient fabrication technologies at the
microscale and the nanoscale. Often we involve both traditional semiconductor
materials as well as non-conventional polymer materials. We focus on developing
MEMS, as well as nanofabrication and nanopatterning technologies. Further, we
apply the micro- and nanoscale fabrication expertise to enable new devices and,
in turn, new systems and applications.
We are developing biologically inspired sensors - sensors with functions and/or
structures based on inspiration from biology. Biology offers exquisite examples
of sensors and sensory intelligence. These have been the subjects of observation
of biology for hundreds of years. With the advent of micro and nanotechnology,
it now becomes possible to build engineering-equivalent of biological sensors.
Through bioinspired sensors research, we seek to advance engineering as well as
deepen understanding of complex biological systems.
Professor Liu's multidisciplinary research program centers on MEMS and devices.
His research covers wide length scales (from nano to micro to macro) and is
vertically integrated (materials to devices to systems).
For example, our group is developing artificial haircell sensors that mimic the
haircell sensor, widely found in many animals and perform a large variety of
functions. The biological haircell, a common neuronal mechanoreceptor, is
responsible for a wide variety of sensing in different animal species. Haircells
are responsible for hearing (human cochlea), flow sensing (insects, spiders, and
fish), vibration sensing (insects), equilibrium sensing (human inner ear), and
joint angle sensing (insect), to name a few examples. We are developing
artificial hairs using microfabrication technology and investigating methods of
increasing their functionality, increasing performance, and reducing packaging
complexity.
In addition, my group is developing massively parallel scanning probe based
nanolithography technology and microfluid lab-on-chip systems for
nanofabrication and biochemical detection. We work closely with faculty members
at the international institute of nanotechnology.
In the Classroom
Prof. Liu is passionate about teaching and mentoring undergraduate and graduate
students to reach full potentials and become future leaders. He teaches in both
Electrical Engineering and Mechanical Engineering areas. The courses he has
covered in the past include solid-state devices, thermal transfer,
electromagnetic waves, microfabrication, and MEMS. He is the author of a
undergraduate textbook "Foundations of MEMS", published by Prentice-Hall in
2006. At Northwestern, he is planning to teachclasses on microfabrication/MEMS
(in Mechanical Engineering) and on electronics circuits (Electrical Engineering
and Computer Science).
Selected Publications
Yingchen Yang, Jack Chen, Jonathan Engel, Saunvit Pandya, Nannan Chen, Craig
Tucker, Sheryl Coombs, Douglas L. Jones, and Chang Liu, "Distant Touch
Hydrodynamic Imaging with an Artificial Lateral Line", The Proceedings of the
National Academy of Sciences, Vol. 103, No. 50, pp. 18891-18895, 2006.
Saunvit D Pandya, Yingchen Yang, Douglas Jones, Jonathan M Engel, and Chang Liu,
"Multisensor Processing Algorithms for Underwater Dipole Localization and
Tracking using MEMS Artificial Lateral Line Sensors" EURASIP Journal on Applied
Signal Processing, (Special issue on multi sensor processing for signal
extraction and applications).
J. Engel, J. Chen, C. Liu, D. Bullen, "Polyurethane rubber all-polymer
artificial hair cell sensor", IEEE/ASME Journal of MEMS, Vol. 15, No. 4, pp.
729-736, 2006.
Chang Liu, Foundations of MEMS, Prentice Hall, August 2005.
J. Engel, J. Chen, Z. Fan, and C. Liu, "Polymer Micromachined Multimodal Tactile
Sensors," Sensors and Actuators A: Physical, vol. 117, no. 1, pp. 50-61, January
3, 2005.
Z. Fan, J. Engel, J. Chen, and C. Liu, "Parylene Surface Micromachined Membranes
for Sensor Applications," IEEE/ASME Journal of Microelectromechanical Systems,
13(3), pp. 484-490, 2004.
J. Chen, Z. Fan, J. Zou, J. Engel, and C. Liu, "Two Dimensional Micromachined
Flow Sensor Array for Fluid Mechanics Studies," Journal of Aerospace
Engineering, Vol. 16, No. 2, pp. 85-97, pp. 1067-1075, April 2003
Sung-Hoon Kim, Jonathan Engel, Chang Liu, and Douglas L. Jones, "Texture
classification using a polymer-based MEMS tactile sensor" Journal of
Micromechanics and Microengineering, 15 (2005) 912-920.
Xuefeng Wang and Chang Liu, "Multifunctional probe array for nano patterning and
imaging," Nano Letters, Vol. 5, No. 10, pp. 1867-1872, Oct 2005.
Kashan A. Shaikh, Kee Suk Ryu, Edgar D. Goluch, Jwa-Min Nam, Juewen Liu, C. Shad
Thaxton, Thomas N. Chiesl, Annelise E. Barron, Yi Lu, Chad A. Mirkin, Chang Liu,
"A Modular Microfluidic Architecture for Integrated Biochemical Analysis," PNAS,
vol. 102, no. 28, pp. 9745-9750, July 2005.
Del Mar Photonics featured components
Del Mar Photonics continuously expands its components
portfolio.
Solar
Prisms for Concentrating Photovoltaic Systems (CPV) Solar cells made of compound semiconductors such
as gallium arsenide are very expensive. Usually very small cells are
installed and various means such as mirrors, lenses, prisms, etc..are used
to concentrate sunlight on the cells. Concentration photovoltaic technology
(CPV) uses the solar radiation with an efficiency of 40%, double that of
conventional solar cells
Del Mar Photonics design custom Concentrating Photovoltaic Systems (CPV) and
supply variety of the optical components for CPV such as
solar prisms shown in the picture.
Axicon Lens
Axicon lens also known as conical lens or rotationally symmetric prism is
widely used in different scientific research and application. Axicon can be
used to convert a parallel laser beam into a ring, to create a non
diffractive Bessel beam or to focus a parallel beam into long focus depth.
Del Mar Photonics supplies axicons with cone angles range from 130° to
179.5° for use with virtually any laser radiation. We manufacture and supply
axicons made from BK7 glass, fused silica and other materials.
Rutile (TiO2) coupling
prisms
Del Mar Photonics offers optical elements made of high quality synthetically
grown Rutile Titanium Dioxide crystals. Rutile’s strong birefringency, wide
transmission range and good mechanical properties make it suitable for
fabrication of polarizing cubes, prisms and optical isolators. Boules having
high optical transmission and homogeneity are grown by proprietary method.
Typical boules have 10 - 15 mm in dia. and up to 25 mm length. Optical
elements sizes - from 2 x 2 x 1 mm to 12.7 x 12.7 x 12.7 mm. Laser grade
polish quality is available for finished elements. So far we the largest
elements that we manufactured are 12 x15 x 5 mm, in which optical axis is
parallel to 15 mm edge, 5 mm is along beam path, 12 x 15 mm faces polished
20/10 S/D, one wave flatness, parallelism < 3 arc.min. (better specs.
available on request).
Vacuum viewport
Del Mar Photonics offer a range of competitively priced UHV viewports ,
Conflat, ISO or KF including a variety of coatings to enhance performance.
Del Mar Photonics viewports are manufactured using advanced techniques for
control of special and critical processes, including 100 percent helium leak
testing and x-ray measurements for metallization control. Windows Materials
include: Fused silica, Quartz , Sapphire , MgF2, BaF2, CaF2, ZnSe, ZnS, Ge,
Si, Pyrex. Standard Viewing diameters from .55" to 1.94 ".
Coating - a range of custom coatings can applied - which include
- Single QWOT
- Broad Band AR
- V coatings
- ITO
- DLC (Diamond like coating)
NARROW-BAND HOLOGRAPHIC FILTERS are intended for
suppression of powerful beams in research and in engineering, in particular, in laser
spectroscopy, and also for protection from blinding and damaging by laser radiation various photo
receiver devices and operator's eyes.
Unlike conventional interference filters, which are made by vacuum
evaporation techniques, holographic filters are fabricated by recording
interference patterns formed between two mutually coherent laser beams. Since all layers are recorded simultaneously within a thick stack, the
optical density of the notch filter is high and its spectral bandwidth
can be extremely narrow. Also, since the layering profile is sinusoidal
instead of square wave, holographic notch filters are free from
extraneous reflection bands and provide significantly higher laser
damage thresholds.
Hydrogen
Thyratrons are used in
such devices as radars with different power levels, high-power pulsed
technical, electrophysical, medical devices and lasers. Sophisticated
design and high quality ceramic-metal envelope determines long lifetime
and very accurate and reliable operation of hydrogen thyratrons under wide range of environmental
conditions. Applications:
- radars
- pulsed lasers power supplies
- medical apparatus
- electrophysical instrumentation
Triggered Three-Electrode Spark Gap Switches are ceramic-metal sealed off gas
discharge trigatron-type devices with a co-axial trigger electrode. These Gas
Discharge Tubes contain no mercury and, due to an advanced design, feature high
reliability and a long lifetime being operating under wide range of
environmental conditions. Applications:
- pulsed installation for processing materials
- installations with plasma focus
- pulse power supplies for lasers and other pulse equipment
- medical apparatus such as lithotriptors and defibrillators
- processing systems for petroleum wells
Trigger Transformers
Del Mar Photonics supply
trigger transformers for triggered spark gaps and
other applications.
Contact us to today to discuss your application or requesta quote.
Trigger Transformers are used to provide a fast high voltage pulse up to
30kV/µs and more. This high voltage pulse is applied to the trigger
electrode to initiate switching action in the
three-electrode
spark gaps. Either positive or negative pulses can be obtained from all
of the transformers.
We are looking forward to hear from you and help you with
your optical and crystal components requirements. Need time to think about
it?
Drop us a line and we'll send you beautiful Del Mar Photonics mug (or
two) so you can have a tea party with your colleagues and discuss your
potential needs.
Del Mar Photonics, Inc. 4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics sales@dmphotonics.com
