A frequency locked, single mode pulsed dye laser. Application to single frequency tunable UV generation
Abstract
This paper presents a new dye laser arrangement in which superposition of both cw and pulsed excitation permits to get a single mode pulsed tunable laser light beam. After amplification, this enables to generate single frequency tunable UV light with good conversion efficiency. An example is given of a high resolution study of Rb Rydberg states.
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Cited by (43)
High-Power and High-repetition-rate widely tunable Narrow-Linewidth low-gain-band Ti: Sapphire laser
2023, Optics and Laser TechnologyA high-power and high-repetition-rate widely tunable narrow-linewidth low-gain-band Ti: sapphire laser dual-end pumped by a 10 kHz 532 nm pulsed laser with an output wavelength of 690–760 nm was demonstrated. A seed-self-injection coupled cavity based on a Littman grating and dispersive prism was employed to narrow the output linewidth. When the pump power was 40.1 W, a maximum output power of 1.89 W at 730 nm was obtained with a linewidth of 1.5 pm and a pulse duration of 38.7 ns. The corresponding conversion efficiency was 4.71 %, and the beam quality in the x and y directions was 1.94 and 1.91, respectively. By successively rotating the front cavity mirror and broadband total reflector, a stable near-single-longitudinal-mode output of 690–760 nm could be achieved, with a maximum power of 2.35 W at 760 nm.
Resonance-enhanced 2 + 2 photon ionization of nitrogen: The lyman-birge-hopfield band system
1993, Journal of Molecular SpectroscopyHigh-resolution resonance-enhanced multiphoton ionization (REMPI) spectroscopy of a pulsed nitrogen beam is applied to determine the (1, 0) to (4, 0) line positions (J″ ≤ 2) of the a1Πg ← X1Σ+g transition. A strong a.c. Stark effect is observed even next to the REMPI threshold pulse energies and is tentatively correlated with certain energy levels near the three-photon energy. At the same time, the REMPI signal, which is not exactly proportional to the a ← X Franck-Condon factors, is dominated by the near-resonant enhancement due to these levels. This is particularly pronounced in the case of the (3, 0) band. In the three other cases, precise zero pulse energy values of the line positionscan be determined by linear extrapolation. The signs of the slopes for these extrapolations are opposite to those expected from the theoretical expression for the dynamical Stark shift. The obtained band origins are used to recalibrate the literature data which, so far, have exhibited major mutual disagreement. A Dunham-type least-squares fit of more than 3100 available tabulated spectral line positions yields a greatly improved mathematical description of this transition for v′ ≤ 15 and v″ ≤ 27, as well as ofa few A3Σ+u and b′1Σ+u levels. The X-state vibrational levels cannot be adequately described by a simple v″ + polynomial. It is, however, found that the application of two separate polynomials for v″ ≤ 5 and v″ > 5 can remove all discrepancies. There are two conclusions from these calculations. The first is that there is an obvious onset of enhanced anharmonicity of the N2 ground state for v″ = 5 which is not observed for the isoelectronic CO molecule. This effect has already been found in earlier, shorter, and less accurate Dunham expansions. These earlier polynomials, however, do not take into account the sudden change of the vibrational frequency at v″ = 5 which must be concluded from two independent experiments by R. E. Miller. This small but distinct change suggests the mathematical treatment of the vibrational levels in the two ranges specified above. An unambiguous interpretation of the effect is not possible at present. No nearby 1Σ+g state is known which might act as a perturber, and, alternatively, a change of the electronic configuration needs to be quantified by a detailed theoretical study. Accurate measurements of the X-state vibrational levels are still rather sparse. Our work strongly suggests further experiments need to be done at a ≤0.001 cm−1 accuracy level that cover the full level range from v″ = 0 to at least v″ = 15 in order to obtain an even more unambiguous representation of this state and to reveal more details of the rotational structure.
PILIS: Post-ISOCELE Laser Isobar Separation - a high efficiency apparatus for laser spectroscopy
1992, Nuclear Inst. and Methods in Physics Research, BA new experimental setup PILIS II has been installed on line with the ISOCELE isotope separator (IPN, Orsay). The mass-separated ions are slowed from 30 kV to 500 V and implanted on a graphite collecting disk. The atoms are then thermally desorbed at the implantation region by Nd-YAG laser pulses and selectively ionised by three laser beams. The ions created are mass identified by a time-of-flight (TOF) system. Two versions of the TOP system with accelerating voltage of 1.5 and 30 kV were used to carry out hyperfine structure measurements. With the 30 kV system we obtained an overall detection efficiency of 8.4 × 10−5. First measurements were performed on very light gold isotopes. It has been shown that PILIS II is well adapted to study very short half-life isotopes ().
Laser spectroscopy of laser-desorbed gold isotopes
1990, Nuclear Physics, Section AChanges in mean-square charge radius δ〈r2〉, and magnetic dipole moments μ1 have been measured for a series of neutron-deficient gold isotopes between A = 186 and 196, and for neutronrich 198,199Au, using the PILIS system on-line with the ISOCELE mass separator. These measurements confirm the existence of the shape transition between A = 186 and 187. The measured μ1 values have been compared with calculations using Nilsson, and symmetric-rotor-plus-quasiparticle models. The results are consistent with the interpretation that 186Au is prolate, and that the heavier isotopes have oblate, or possibly triaxial deformation.
Shape transition in neutron deficient Pt isotopes
1989, Physics Letters BIsotope shift (IS) and hyperfine structure (HFS) measurements have been performed for 185,187,189,191,195Pt using the PILIS (Post ISOCELE Laser Isobar Separation) apparatus installed at the ISOCELE facility. Magnetic and quadrupole moments have been deduced from the HFS results. The change radius changes determined for these odd nuclei from the IS results, added to the δ <r2 > values of the even-A nuclei, are compared to the results of lattice Hartee-Fock+BCS calculations for asymmetric solutions. 185Pt is confirmed to be prolate shaped whereas 187,189,191Pt are likely triaxial in their ground states.
Pilis: Post-ISOCELE laser isobar separation - an apparatus for laser spectroscopic studies of laser-desorbed atoms
1988, Nuclear Inst. and Methods in Physics Research, BAn apparatus for laser spectroscopic studies of laser-desorbed radioactive atoms has been installed on-line at the ISOCELE isotope separator (IPN, Orsay). Mass-separated gold ions were first implanted onto a substrate, and then thermally desorbed by a Nd-YAG laser pulse. A three-step, two-resonance scheme was used to selectively ionize the desorbed gold atoms. The ions created were then mass-identified through a time-of-flight technique. The laser system used has a linewidth of 130 MHz, and an actual experimental resolution of 170 MHz for the stable 197Au was obtained. It has been demonstrated that with 1010 total implanted ions, several laser scans can be performed, and that a 5 × 10−5 ion conversion efficiency for the desorbed gold atoms was reached at resonance. On-line measurements of the isotope shift (IS) and hyperfine structure (HFS) for several gold isotopes were carried out. With the high-resolution capability, a negative sign for the magnetic moment of 192Au was obtained. The HFS of 187Au confirms an earlier laser spectroscopic study, and the sudden variation of IS between 187Au and 186Au was reproduced.