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I am looking to buy a laser system which will be used for
1. Nonlinear optics exp - such as Z-scan
2. optical pumping for lasing experiments in organic molecules and
nanocrystals.
3. Time resolved PL and pump probe experiments.
Wavlengths of interest - 1064, 532, 355.

Any suggestions?

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POSTDOCTORAL POSITION

Cellular neurobiology and imaging


    Postdoctoral position to study the properties and functions of
calcium release waves in the dendrites of hippocampal and cortical
pyramidal neurons (see Neuron 24: 727-737, 1999 and J. Physiol. 549:
471-488, 2003 for recent examples of our work in this area).
Experiments will involve whole-cell recording in slices from rats
and
mice, calcium imaging, 2-photon confocal microscopy, and laser
uncaging of appropriate molecules (e.g. glutamate, IP3, and
calcium).
Experience with electrophysiology and an interest in biophysical
mechanisms are required.
    Our laboratory has a general interest in the properties of
dendrites of CNS neurons and how they relate to the mechanisms of
synaptic integration and synaptic plasticity, particularly LTD and
endocannabinoid-mediated suppression of inhibition. We are part of
small community of closely interacting neuroscientists at New York
Medical College (eleven faculty members) with particular strength in
cellular neurobiology.
    Send letter, C.V., and names of two references to Dr. William
Ross, Dept. of Physiology, New York Medical College, Valhalla, NY
10595; email: ross@.... See:
http://www.nymc.edu/people/indviewg.asp?which=william_ross
for more details about our work and the past history of this
laboratory. Start date is flexible but would prefer someone in the
fall of 2005. Salary is competitive. NYMC is 30 minutes from
Manhattan in a suburban environment.

From: Caltech Media Relations
http://pr.caltech.edu/media/Press_Releases/PR12728.html

Nobel Laureate Receives $17.5 Million Grant to Create the New Field
of Physical Biology
PASADENA, Calif.--Nobel Prize-winning chemist and physicist Ahmed
Zewail has received an $17.5 million grant from the Gordon and Betty
Moore Foundation to create the Ultrafast Science and Technology
(UST) Center at the California Institute of Technology.

The center will focus on a new scientific discipline at Caltech for
which Zewail has coined the name "physical biology." The field will
create new ways of understanding the dynamical behavior of
biological systems by directly observing them in the four dimensions
of space and time.

"The idea is to combine the principles of fundamental physics and
chemistry to address complexity of biology at the molecular level,"
explains Zewail, who won his Nobel Prize in Chemistry in 1999 for
pioneering the development of the field of femtochemistry, which
made it possible using lasers to freeze-frame motions taking place
in a millionth of a billionth of a second.

Femtochemistry has been hailed as the breakthrough that allowed the
motions of atoms in a molecule to be observed for the first time.
Studies of basic life processes, however, because of their
complexity, demand microscopic observation of all atoms in
biological structures as those structures change.

The UST Center will be a nucleus for interactions between faculty
and research assistants from the different disciplines of physics,
chemistry, and biology at Caltech. The mission of the UST Center
will be to develop the science and technology for imaging biological
and molecular structures in space and time using diffraction,
spectroscopy, and microscopy.

"The vision of UST is a new integrated science of structure and
dynamics with the aim of deciphering the fundamental physics of
molecular and biological behavior," Zewail says. "Our goal is to
address the fundamentals at varying levels, from the atom to the
cell."

Systems biologists have had success in applying breakthroughs in
genomics, computational sciences, and other disciplines, with the
aim of explaining how cells interact as a network. The aim of
physical biology is to provide an understanding of the molecular
architecture and transformations essential to function--of how
things go from structure to dynamic interactions to function. And
for this, it is necessary to look in all four dimensions at systems,
such as proteins or cells, as they go about their business.

"All existing methods have focused on either the spatial or the
temporal resolution," says Zewail, "but in complex systems,
including biological systems, the combined resolutions are essential
for a unified picture."

A very recent research article from Caltech in the journal
Proceedings of the National Academy of Sciences (PNAS), volume 102,
page 7069-7073, dated May 17, 2005, describes an early success in
four-dimensional ultrafast electron microscopy that holds
considerable potential for the imaging of materials and cells as
they transform. The researchers were able, using single-electron
packets, to directly image the structure of rat intestinal cells in
a femtosecond snapshot. A paper in Science, volume 304, page 80-84,
dated April 2, 2004, provides the methodology for obtaining atomic-
scale resolutions using ultrafast electrons. A patent is pending.

This recent success in imaging was commended by Sir John Thomas of
Cambridge University in a highlight entitled "A Revolution in
Electron Microscopy," which was published in the July 26, 2005,
issue of the journal Angewandte Chemie (www.angewandte.org). Thomas
said, "The development at Caltech of 4D diffraction,
crystallography, and microscopy is indeed revolutionary. The door is
now open for myriad explorations in the physical and biological
sciences. "

David Tirrell, McCollum-Corcoran Professor and chair of the Division
of Chemistry and Chemical Engineering says, "This is an enormously
exciting opportunity for Caltech. Ahmed has already played a central
role in showing us how chemical reactions occur; now with the help
of the Moore Foundation, he and his colleagues in the UST Center
will be able to bring a similar level of rigorous understanding to
the processes that are required to sustain life and health."

"Seeing is believing, says Tom Tombrello, Kenan Professor and chair
of Caltech's Division of Physics, Mathematics and Astronomy. "We
shall soon be in a position to see the molecules of life in action
and be able to settle some of the fundamental scientific debates of
our own times. Science progresses by observation, and when we are
able to develop unique techniques of 'seeing,' new and unexpected
areas of our world are illuminated."

Zewail is Pauling Professor of chemistry and physics at Caltech.

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Hi all!!
I am a 1st year graduate student working on ultrafast laser
spectroscopy.We are setting up a femtosecond lab.I want to know from
where can i get lenses with high damage threshold and less dispersion
and 400-800 broadband mirror to work in 40-130fs lasers.
Looking forward to reply,
woth regards,
Babita Mallick

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Do you now how build a correlator?

Ch.

  --- s_egorov <s_egorov@...> escribió:

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