By Jun Ye, Steven T. Cundiff
Over the past few years, there was a convergence among the fields of ultrafast technological know-how, nonlinear optics, optical frequency metrology, and precision laser spectroscopy. those fields were constructing principally independently because the start of the laser, achieving awesome degrees of functionality. at the ultrafast frontier, pulses of just a couple of cycles lengthy were produced, whereas in optical spectroscopy, the precision and backbone have reached one half in even supposing those achievements seem to be thoroughly disconnected, advances in nonlinear optics supplied the fundamental hyperlink among them. The ensuing convergence has enabled unparalleled advances within the regulate of the electrical box of the pulses produced through femtosecond mode-locked lasers. The corresponding spectrum includes a comb of sharp spectral traces with well-defined frequencies. those new strategies and services are generally called “femtosecond comb know-how. ” they've got had dramatic impression at the assorted fields of precision size and severe nonlinear optical physics. The historic historical past for those advancements is equipped within the Foreword through of the pioneers of laser spectroscopy, John corridor and Theodor Hänsch. certainly the advancements defined during this e-book have been foreshadowed by means of Hänsch’s early paintings within the Seventies whilst he used picosecond pulses to illustrate the relationship among the time and frequency domain names in laser spectroscopy. This paintings complemented the advances in precision laser stabilization built by means of corridor.
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Extra info for Femtosecond Optical Frequency Comb: Principle, Operation, and Applications
2 Phase lock between separate mode-locked lasers Phase locking of separate femtosecond lasers requires a step beyond synchronization of the two pulse trains. One needs effective detection and stabilization of the phase difference between the two optical carrier waves underlying the pulse envelopes . After synchronization matches the repetition rates phase locking requires that the spectral combs of the individual lasers are maintained exactly coincident in the region of spectral overlap so that the two sets of optical frequency combs form a continuous and phase-coherent entity.
1. INTRODUCTION 35 Agreement between experiment and theory using the four-term effective hyperfine Hamiltonian is at the kilohertz level for a few selected transitions. For the first excited electronic state B with the dissociation limit, our goal is to perform a systematic, high-precision investigation of hyperfine interactions over an extensive range of rovibrational quantum numbers coupled with a large range of internuclear separations. Such a study has allowed us to understand the rovibrational dependence of the hyperfine interactions (and the dependence on internuclear distance) based on ab initio molecular potential-energy curves and the associated electronic wave functions.
A servo loop controls the repetition rate of the laser by comparing this signal to a microwave clock or an optical-frequency standard. The output of the KLM Ti:sapphire laser is launched into a length of microstructure fiber. Using the minimum possible amount of spectral broadening in the microstructure fiber works best. For this reason, all metrology experiments start with KLM Ti:sapphire lasers that produce pulse widths of 30 fs or less. This strategy generally results in an octave-spanning spectrum for modest pulse energies and short lengths of microstructure fiber.