Pump-probe study of plasma dynamics in gas-filled photonic crystal fiber using counter-propagating solitons
arXiv:2006.07250 · doi:10.1103/PhysRevApplied.12.064015
Abstract
We present a pump-probe technique for monitoring ultrafast polarizability changes. In particular, we use it to measure the plasma density created at the temporal focus of a self-compressing higher-order pump soliton in gas-filled hollow-core photonic crystal fiber. This is done by monitoring the wavelength of the dispersive wave emission from a counter-propagating probe soliton. By varying the relative delay between pump and probe, the plasma density distribution along the fiber can be mapped out. Compared to the recently introduced interferometric side-probing for monitoring the plasma density, our new technique is relatively immune to instabilities caused by air turbulence and mechanical vibration. The results of two experiments on argon- and krypton-filled fiber are presented, and compared to numerical simulations. The technique provides an important new tool for probing photoionization in many different gases and gas mixtures as well as ultrafast changes in dispersion in many other contexts.
arXiv comment7 pages, 3 figures, peer-reviewed and published
References in corpus (12)
- Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
- Spatio-temporal isolation of attosecond soft X-ray pulses in the water window
- Generation of micro-J pulses in the deep UV at MHz repetition rates
- Extreme Nonlinear Optics in a Femtosecond Enhancement Cavity
- Novel mid-infrared dispersive wave generation in gas-filled PCF by transient ionization-driven changes in dispersion
- Amplification of intense light fields by nearly free electrons
- Long-lived refractive index changes induced by femtosecond ionization in gas-filled single-ring photonic crystal fibers
- Bound electron nonlinearity beyond the ionization threshold
- PHz-wide spectral interference through coherent plasma-induced fission of higher-order solitons
- Memory effects in the long-wave infrared avalanche ionization of gases: A review of recent progress
- Intrapulse Impact Processes in Dense-Gas Femtosecond Laser Filamentation
- Spatio-temporal measurement of ionization-induced modal index changes in gas-filled PCF by prism-assisted side-coupling