Laurent Hilico

Narrow-line phase-locked quantum cascade laser in the 9.2 μm range

We report the operation of a 50 mW continuous-wave quantum cascade laser (QCL) in the 9.2 microm range, phase locked to a single-mode CO(2) laser with a tunable frequency offset. The wide free-running emission spectrum of the QCL (3-5 MHz) is strongly narrowed down to the kilohertz range, making it suitable for high-resolution molecular spectroscopy.

Relativistic corrections of m α 6 ( m ∕ M ) order to the hyperfine structure of the H 2 + molecular ion

The

Fundamental Transitions and Ionization Energies of the Hydrogen Molecular Ions with Few ppt Uncertainty

m{ensuremath{alpha}}^{6}(m∕M)

Narrow-linewidth quantum cascade laser at 8.6 μm

-order corrections to the hyperfine splitting in the

Quantum fluctuations in optical bistability: calculations from linear response theory

mathrm{H}_{2}{}^{+}

One-loop vacuum polarization atmα7order for the two-center problem

ion are calculated. That allows a reduction of the uncertainty in the frequency intervals between hyperfine sublevels of a given rovibrational state to about

Semi-Classical Input-Output Linearization Techniques for Quantum Fluctuations and Beyond

10phantom{rule{0.3em}{0ex}}mathrm{ppm}

Squeezing in nonlinear cavities

. The results are in good agreement with the high-precision experiment carried out by Jefferts [Phys. Rev. Lett. 23, 1476 (1969)].

Proposal to measure the Gravitational Behaviour of Antihydrogen at Rest

We calculate ionization energies and fundamental vibrational transitions for H_{2}^{+}, D_{2}^{+}, and HD^{+} molecular ions. The nonrelativistic quantum electrodynamics expansion for the energy in terms of the fine structure constant α is used. Previous calculations of orders mα^{6} and mα^{7} are improved by including second-order contributions due to the vibrational motion of nuclei. Furthermore, we evaluate the largest corrections at the order mα^{8}. That allows us to reduce the fractional uncertainty to the level of 7.6×10^{-12} for fundamental transitions and to 4.5×10^{-12} for the ionization energies.

High-accuracy calculations in the H+2 molecular ion : towards a measurement of mp/me

We report on a narrow-linewidth distributed-feedback quantum cascade laser at 8.6 μm that is optical-feedback locked to a high-finesse V-shaped cavity. The spectral purity of the quantum cascade laser is fully characterized using a high-sensitivity optical frequency discriminator, leading to a 1 ms linewidth of less than 4 kHz and a minimum laser frequency noise spectral density as low as 0.01 Hz2/Hz for Fourier frequencies larger than 100 kHz. The cumulative standard deviation of the laser intensity is better than 0.1% over an integration bandwidth from 2 Hz to 100 MHz.