Del Mar Photonics - Product brochures
Del Mar Photonics delivered Avoca SPIDER femtosecond measurement system and Rincon cross-correlator to University of Nebraska-Lincoln
Avoca SPIDER brochure - Avoca SPIDER manual - Avoca SPIDER software
Rincon brochure - Rincon manual - Rincon software
These items were ordered by Sudeep Banerjee.
Sample of Sudeep Banerjee research interests:
Abstract Submitted for the DAMOP05 Meeting of The American Physical Society
Optical detection and temporal characterization of an ultra-fast laser-produced
electron beam
SUDEEP BANERJEE, SCOTT SEPKE, Department of Physics and Astronomy, University of
Nebraska, Lincoln, Nebraska, ANTHONY VALENZUELA, Nuclear Engineering and
Radiological Sciences, University of Michigan, Ann Arbor, Michigan, RAHUL SHAH,
Electrical Engineering and Computer Science, University of Michigan, Ann Arbor,
Michigan, DONALD UMSTADTER, Department of Physics and Astronomy, University of
Nebraska, Lincoln, Nebraska
The interaction of a laser-produced electron beam with an ultra-intense laser
pulse in free space is studied. We show that the optical pulse with a0=0.5
imparts momentum to the electron beam, causing it to deflect along the laser
propagation direction. The observed 3-degree angular deflection is found to be
independent of polarization and in good agreement with a theoretical model for
the interaction of free electrons with a tightly focused gaussian pulse, but
only when longitudinal fieelds are taken into account. This technique is used to
temporally characterize a sub-picosecond laser-wake field-driven electron bunch.
Applications to modifying electron-beam properties (i.e., emittance, duration
and energy spread) are also discussed.
All-laser-driven, MeV-energy X-ray source for detection of SNM
Banerjee, S.; Powers, N.; Ramanathan, V.; Cunningham, N.; Chandler-Smith,
N.; Shouyuan Chen; Shadwick, B.; Umstadter, D.; Vane, R.; Schultz, D.; Beene,
J.; Pozzi, S.
Technologies for Homeland Security, 2008 IEEE Conference on
Volume , Issue , 12-13 May 2008 Page(s):1 - 6
Summary:A quasi-monoenergetic MeV X-ray source based on laser-driven electron
acceleration and Thomson scattering is under development at the Extreme Light
Laboratory at the University of Nebraska, Lincoln. Reported are experimental
results on the generation of high- brightness, nearly monoenergetic 300-MeV
energy electron beams with the high power, short-pulse DIOCLES laser system. The
laser system produces > 100 TW of maximum peak power per pulse. The maximum
pulse energy is 3.5 J with a temporal duration of 30 fs. Energetic electron
beams are produced by focusing a laser pulse with 40-50-TW peak-power on a
supersonic helium nozzle to drive a relativistic plasma wave (laser wakefield).
Electron beams with energies of 320 + 2.0 MeV are accelerated over a distance of
3 mm. The beam has an angular spread of 5 mrad with a charge of 100 pC. The use
of a stable and well-characterized laser system - in conjunction with high
temporal contrast and adaptive optics correction on the amplified beam (to
obtain ideal focal spots) - has enabled generation of very reproducible electron
beams, both in terms of energy and pointing stability. It is found that electron
acceleration is most efficient, beam brightness is highest and reproducibility
is best in the resonant regime, where the temporal duration of the laser pulse
equals the plasma period. A beamsplitter is used after compression to generate
two pulses in the ratio of 80% to 20%. The higher power pulse drives the laser
wakefield to produce the energetic electron beams while the lower power pulse is
transported through an independent line and focused on the electron beam to
generate X-rays. Experiments are currently in progress to observe and
characterize the X-ray beam. Theoretical predictions indicate that 1~2 plusmn
10% - MeV X-ray photons can be produced in a well-collimated beam. The expected
photon flux is 10 photons per laser shot. Characterization of such a high-flux
high energy X-ray beam is in progress. Quasi-monoenerg- - etic X-rays offer
significant advantages for the detection of sensitive nuclear materials using
techniques such as nuclear resonance fluorescence. A systematic effort is also
in progress to further improve the characteristics of laser produced electron
beams with regard to monochromaticity, divergence and stability and also permit
easy tunability of the X-ray source. The design of a compact system capable of
being deployed in the field will also be discussed as part of a long-term
solution to the critical requirement for an efficient cargo-scanning system.
Rincon Third Order Cross-Correlator (TOCC)
Each Rincon is optimized for customer laser system and required range of
measurements.
The complete setup geometry, dimensions of non-linear crystals and some
essential optics are all function of laser parameters and user-chosen tradeoffs
between sensitivity, time resolution, time window, overall size etc.
We need the following information to set the tradeoffs and get all critical
data necessary for the design which is optimized for your system:
1. What is wavelength of you laser system?
2. What is the repetition rate?
3. What is the normal pulse energy and beam diameter?
4. Is the laser pulse chirped?
5. What is the spectral bandwidth?
6. What is the pulsewidth?
7a. What is the expected (or estimated) contrast ratio as a function of delay
from peak?
7b. What is the minimum necessary contrast ratio as a function of delay from
peak?
8. What is beam quality (i.e. beam divergence relative to diffraction-limited
one)?
The third order cross-correlator Rincon has been specifically developed for measuring a wide array of output parameters from ultrafast laser systems including: contrast ratio of laser pulses, determining pulse pedestal, pre- and post-pulses, and amplified spontaneous emission (ASE) in femtosecond systems. It also provides information about the third-order cross-correlation function of pulse intensity on a femtosecond scale and can be used for alignment of high power femtosecond lasers. Cross-correlator includes opto-mechanical assembly and electronics with USB interface. System is easy to operate and includes a full set of user friendly software tools for data collection and analysis.
To request a quote for Rincon cross-correlator please e-mail sales@dmphotonics.com with detailed answers to the questions above.
Spectral phase interferometry for direct electric- field reconstruction (SPIDER) is one technique that can recover the spectral phase of an input pulse, without needing any reference pulse. SPIDER interferes two pulses which are separated in time and in frequency, and the resultant interferogram is read by a spectrometer. A thin etalon is used to pick off a portion of the input pulse and split it into two pulses delayed in time. The majority of the input pulse passes through the etalon and is stretched in time with a diffraction grating stretcher. The stretched pulse and the pulse pair off the etalon are recombined in a non-linear KDP crystal. Because the separation of the pulse pair is less than the pulse length of the stretched pulse the two pulses off the etalon will mix with different frequencies in the stretched pulse. This frequency difference is known as the spectral shear and is the frequency equivalent of a temporal delay. The resulting interferogram is then collected with a spectrometer. By performing a direct analysis of this interferogram, the spectral phase of the input pulse can be recovered. In addition, by independently measuring the pulse spectrum and performing a Fourier transform, the phase and intensity as a function of time can be retrieved. Thus the SPIDER technique offers a direct non-iterative measurement of the electric field of an ultrafast pulse.
Advantages
• Low noise sensitivity
• The interferogram measurements
taken with a 1-D spectrometer,
lowering cost, and increased simplicity.
• Fast: interferogram reconstruction
calculations can be done in
milliseconds on a standard PC.
• SPIDER setup involves no moving
parts during operation.
• The acquisition of the experimental
trace is done in a single-shot.
• Solid theoretical and conceptual
background.
• Power supply from PC interface
Del Mar Photonics - Product brochures
Del Mar Photonics delivered Avoca SPIDER femtosecond measurement system and Rincon cross-correlator to University of Nebraska-Lincoln
Avoca SPIDER brochure - Avoca SPIDER manual - Avoca SPIDER software