Towards Precision Measurements at UASLP

Journal of Physics Conference Series · 2016-03-01 · 3 citations

Atomic interferometry is a very sensitive technique to measure small forces. Here we present an overview of the progress towards interferometric measurements in our laboratory. We characterize the magnetic field noise and describe the strategies to minimize the sensitivity to magnetic field fluctuations. We introduce as well a system for Raman excitation with minimum phase noise and the frequency filtering needed to implement it. Finally, we demonstrate atomic interferometry with a frequency sensitivity of 3 Hz.

Realization of an Er 2D MOT for a Na+Er mixture experiment

Bulletin of the American Physical Society · 2016-05-25

Multiple Isotope Trap from a Single Laser

Latin America Optics and Photonics Conference · 2014-01-01

We present a system to obtain simultaneous trapping of multiple isotopes using a single laser and a fiber modulator. The system moves all the control of the beams from the optical to the RF world. Article not available.

Multiple Isotope Magneto Optical Trap from a single diode laser

APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts · 2013-05-01

Multiple isotope magneto-optical trap from a single diode laser

Journal of the Optical Society of America B · 2013-04-12 · 14 citations

We present a dual isotope magneto-optical trap produced using a single diode laser. We generate all the optical frequencies needed for trapping both species using a fiber intensity modulator. All the optical frequencies are amplified simultaneously using a tapered amplifier. The independent control of each frequency is on the RF side rather than on the optical side. This introduces an enormous simplification for laser-cooling applications that often require an acousto-optic modulator for each laser beam. Frequency-changing capabilities are limited by the modulator bandwidth (10 GHz). Traps for more isotopes can be simply added by including additional RF frequencies on the modulator.

Capturing ultrafast structural evolutions with a single pulse of MeV electrons: Radio frequency streak camera based electron diffraction

Journal of Applied Physics · 2010-12-01 · 60 citations

In this paper we report on the experimental demonstration of using relativistic electron diffraction and an radiofrequency deflecting cavity to capture in a single shot the entire time-history of the ultrafast laser-induced heating and melting of a single crystal gold sample. By recording the time variation in the Bragg peaks on the streak image of a 16 ps long electron beam it is possible to reconstruct with 400 fs temporal resolution the evolution of the sample structure induced by a 35 mJ/cm2 400 nm laser pump pulse.

Micro-channel plate detector for ultra-fast relativistic electron diffraction

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · 2010-02-15 · 1 citations

Multiphoton Photoemission from a Copper Cathode Illuminated by Ultrashort Laser Pulses in an rf Photoinjector

Physical Review Letters · 2010-02-22 · 82 citations

In this Letter we report on the use of ultrashort infrared laser pulses to generate a copious amount of electrons by a copper cathode in an rf photoinjector. The charge yield verifies the generalized Fowler-Dubridge theory for multiphoton photoemission. The emission is verified to be prompt using a two pulse autocorrelation technique. The thermal emittance associated with the excess kinetic energy from the emission process is comparable with the one measured using frequency tripled uv laser pulses. In the high field of the rf gun, up to 50 pC of charge can be extracted from the cathode using a 80 fs long, 2 microJ, 800 nm pulse focused to a 140 mum rms spot size. Taking into account the efficiency of harmonic conversion, illuminating a cathode directly with ir laser pulses can be the most efficient way to employ the available laser power.

Electro-optic sampling at 90 degree interaction geometry for time-of-arrival stamping of ultrafast relativistic electron diffraction

Physical Review Special Topics - Accelerators and Beams · 2010-02-16 · 34 citations

In this paper we study a new geometry setup for electro-optic sampling (EOS) where the electron beam runs parallel to the $⟨110⟩$ face of a ZnTe crystal and the probe laser is perpendicular to it and to the beam path. The simple setup is used to encode the time-of-arrival information of a $3.5\text{ }\text{ }\mathrm{MeV}<10\text{ }\text{ }\mathrm{pC}$ electron bunch on the spatial profile of the laser pulse. The electric field lines inside the dielectric bend at an angle due to a relatively large ($n\ensuremath{\sim}3$) index of refraction of the ZnTe crystal. We found theoretically and experimentally that the EOS signal can be maximized with a proper choice of incoming laser polarization angle. We achieved single-shot nondestructive measurement of the relative time of arrival between the pump and the probe beams thus improving the temporal resolution of ultrafast relativistic electron diffraction experiments.

Laser-induced melting of a single crystal gold sample by time-resolved ultrafast relativistic electron diffraction

Applied Physics Letters · 2010-08-09 · 119 citations

We report the experimental demonstration of time-resolved relativistic electron diffraction. Single shot diffraction patterns from a single crystal gold sample were recorded using ultrashort 3.5 MeV electron bunches from a radio frequency photoinjector. By scanning the pump pulse time-delay, we studied the Bragg peaks amplitude change due to the laser-induced melting of the sample. The observed time scale matches the one predicted using a simple two temperature model of the heating of the thin foil. Time-resolved relativistic electron diffraction using megaelectronvolt electron beams with 107 particles in 100 fs bunch length opens exciting possibilities in ultrafast structural dynamics.