E. Eyler | University of Connecticut (original) (raw)

Papers by E. Eyler

Journal of the Optical Society of America B, 1994

We examine the evolution of the optical phase in a nanosecond-pumped dye amplifier and show that ... more We examine the evolution of the optical phase in a nanosecond-pumped dye amplifier and show that the time-dependent gain introduces optical phase distortions. For the case of uniform pumping and weak input-beam intensity an analytic expression for the evolution of the optical phase is derived. Even for a temporally symmetric pump pulse the amplified pulse has an asymmetric frequency spectrum caused by the contribution of the fluorescence rate to the dynamics of the amplification process. When the injected beam is pulsed, the evolution of the optical phase varies with the relative timing between the input and the pump pulses. The model is tested against experimental results for an amplifier that uses DCM dye dissolved in dimethyl sulfoxide. The rms deviation between the measured and the calculated behavior of the instantaneous frequency is less than 6 MHz.

Applied Optics, 1997

We report on the generation of tunable nanosecond pulsed VUV radiation near 120 nm using differen... more We report on the generation of tunable nanosecond pulsed VUV radiation near 120 nm using differencefrequency mixing in H 2 . Our scheme uses two dye lasers, one fixed at 606 nm and the other tunable in the red. These convenient wavelengths simplify the metrology needed for accurate VUV laser spectroscopy. Efficient VUV generation is attained with modest Nd:YAG pump laser energies ͑approximately 160 mJ at 532 nm͒, making the scheme attractive even when narrow bandwidths are not essential.

Journal of the Optical Society of America B, 1994

Using an optical heterodyne technique, we have measured the phase evolution of nanosecond laser p... more Using an optical heterodyne technique, we have measured the phase evolution of nanosecond laser pulses produced by several different dye-amplifier configurations. Considerable frequency chirping is observed as well as average frequency shifts of a few parts in 108. We investigate the dependence of this chirping on the amplifier design and the pump laser to identify the best arrangement for precision measurements. We also report calculations of nonlinear phase shifts in frequency-doubling crystals, which can significantly perturb the laser frequency. Finally, we compare the measured phase evolution of second-harmonic radiation with predictions made from the squared electric field of the fundamental.

Physical Review A, 1990

High-resolution laser spectroscopy is used to study the Stark effect in helium. The energies, wid... more High-resolution laser spectroscopy is used to study the Stark effect in helium. The energies, widths, intensities, and shapes of resonances above the classical ionization threshold are measured for a wide range of electric field strengths. The high resolution of the lasers combined with careful design of the electric field plates allow accurate determination of the line-shape parameters, including linewidths and

Physical Review A, 2007

Experiments in dense, ultracold gases of rubidium Rydberg atoms show a considerable decrease of t... more Experiments in dense, ultracold gases of rubidium Rydberg atoms show a considerable decrease of the radiative excited state lifetimes compared to dilute gases. This accelerated decay is explained by collective and cooperative effects, leading to superradiance. A novel formalism to calculate effective decay times in a dense Rydberg gas shows that for these atoms the decay into nearby levels increases by up to three orders of magnitude. Excellent agreement between theory and experiment follows from this treatment of Rydberg decay behavior.

Arxiv preprint quant- …, 2005

In recent years, ultracold atomic gases have been used to probe a variety of many-body phenomena ... more In recent years, ultracold atomic gases have been used to probe a variety of many-body phenomena such as Bose-Einstein condensation [1, 2] and degenerate Fermi gases [3]. In addition to collective effects due to parti-cle statistics, other manifestations of many-body physics have been ...

We form ultracold ground-state Rb 2 molecules by photoassociating pairs of atoms in a magneto-opt... more We form ultracold ground-state Rb 2 molecules by photoassociating pairs of atoms in a magneto-optical trap into the 0 + u state, which decays radiatively into high vibrational levels of the X 1 + g state. Sensitive and vibrationally stateselective detection is achieved by means of resonantly-enhanced two-photon ionization with a pulsed laser. Frequency scans of the detection laser reveal a long vibrational progression to a previously unobserved electronic excited state, which we identify as the 2 1 + u state. Most of its vibrational spectrum is in excellent agreement with predictions based on ab initio potentials, although the lowest vibrational levels exhibit strong perturbative mixing with the triplet 2 3 u state. The detection method reported here, with minor variations, should be effective for the entire potential well of the X state. In this work no transitions are observed from vibrational levels above v = 118, but this turns out to be a limitation not of the detection method but rather of the photoassociative formation scheme, due to re-excitation of the highest-v levels by the same photoassociation laser that produces them.

Journal of the Optical Society of America B, 1994

We examine the evolution of the optical phase in a nanosecond-pumped dye amplifier and show that ... more We examine the evolution of the optical phase in a nanosecond-pumped dye amplifier and show that the time-dependent gain introduces optical phase distortions. For the case of uniform pumping and weak input-beam intensity an analytic expression for the evolution of the optical phase is derived. Even for a temporally symmetric pump pulse the amplified pulse has an asymmetric frequency spectrum caused by the contribution of the fluorescence rate to the dynamics of the amplification process. When the injected beam is pulsed, the evolution of the optical phase varies with the relative timing between the input and the pump pulses. The model is tested against experimental results for an amplifier that uses DCM dye dissolved in dimethyl sulfoxide. The rms deviation between the measured and the calculated behavior of the instantaneous frequency is less than 6 MHz.

Applied Optics, 1997

We report on the generation of tunable nanosecond pulsed VUV radiation near 120 nm using differen... more We report on the generation of tunable nanosecond pulsed VUV radiation near 120 nm using differencefrequency mixing in H 2 . Our scheme uses two dye lasers, one fixed at 606 nm and the other tunable in the red. These convenient wavelengths simplify the metrology needed for accurate VUV laser spectroscopy. Efficient VUV generation is attained with modest Nd:YAG pump laser energies ͑approximately 160 mJ at 532 nm͒, making the scheme attractive even when narrow bandwidths are not essential.

Journal of the Optical Society of America B, 1994

Using an optical heterodyne technique, we have measured the phase evolution of nanosecond laser p... more Using an optical heterodyne technique, we have measured the phase evolution of nanosecond laser pulses produced by several different dye-amplifier configurations. Considerable frequency chirping is observed as well as average frequency shifts of a few parts in 108. We investigate the dependence of this chirping on the amplifier design and the pump laser to identify the best arrangement for precision measurements. We also report calculations of nonlinear phase shifts in frequency-doubling crystals, which can significantly perturb the laser frequency. Finally, we compare the measured phase evolution of second-harmonic radiation with predictions made from the squared electric field of the fundamental.

Physical Review A, 1990

High-resolution laser spectroscopy is used to study the Stark effect in helium. The energies, wid... more High-resolution laser spectroscopy is used to study the Stark effect in helium. The energies, widths, intensities, and shapes of resonances above the classical ionization threshold are measured for a wide range of electric field strengths. The high resolution of the lasers combined with careful design of the electric field plates allow accurate determination of the line-shape parameters, including linewidths and

Physical Review A, 2007

Experiments in dense, ultracold gases of rubidium Rydberg atoms show a considerable decrease of t... more Experiments in dense, ultracold gases of rubidium Rydberg atoms show a considerable decrease of the radiative excited state lifetimes compared to dilute gases. This accelerated decay is explained by collective and cooperative effects, leading to superradiance. A novel formalism to calculate effective decay times in a dense Rydberg gas shows that for these atoms the decay into nearby levels increases by up to three orders of magnitude. Excellent agreement between theory and experiment follows from this treatment of Rydberg decay behavior.

Arxiv preprint quant- …, 2005

In recent years, ultracold atomic gases have been used to probe a variety of many-body phenomena ... more In recent years, ultracold atomic gases have been used to probe a variety of many-body phenomena such as Bose-Einstein condensation [1, 2] and degenerate Fermi gases [3]. In addition to collective effects due to parti-cle statistics, other manifestations of many-body physics have been ...

We form ultracold ground-state Rb 2 molecules by photoassociating pairs of atoms in a magneto-opt... more We form ultracold ground-state Rb 2 molecules by photoassociating pairs of atoms in a magneto-optical trap into the 0 + u state, which decays radiatively into high vibrational levels of the X 1 + g state. Sensitive and vibrationally stateselective detection is achieved by means of resonantly-enhanced two-photon ionization with a pulsed laser. Frequency scans of the detection laser reveal a long vibrational progression to a previously unobserved electronic excited state, which we identify as the 2 1 + u state. Most of its vibrational spectrum is in excellent agreement with predictions based on ab initio potentials, although the lowest vibrational levels exhibit strong perturbative mixing with the triplet 2 3 u state. The detection method reported here, with minor variations, should be effective for the entire potential well of the X state. In this work no transitions are observed from vibrational levels above v = 118, but this turns out to be a limitation not of the detection method but rather of the photoassociative formation scheme, due to re-excitation of the highest-v levels by the same photoassociation laser that produces them.