Spectral characteristics of short-pulse amplifiers

Mark D. Rotter, Roger A. Haas

Victor L. Kolpashchikov, R. I. Soloukhin, T. A. Syroezhko

Nikolai N Il'ichev, A V Larikov, A A Malyutin

An approximate theory of a multipass amplifier with an arbitrary degree of overlap of the amplified beams is used to consider the case of pulses with a low degree of temporal coherence. An analytic description is proposed for the energy and spectral characteristics of the radiation amplified under different conditions. It is shown that the relationships obtained can be used to describe the emission spectrum of an oscillator with instantaneous Q switching.

A O Markano, Viktor T Platonenko

Numerical methods are used to investigate the characteristics of a short pulse propagating in a molecular amplifying medium allowing for coherence effects, relaxation processes, and degeneracy of the projections of the rotational momentum. The results obtained allowing for and neglecting the distribution over the orientations are compared.

Alex B Borisov, Xiangyang Song, Ping Zhang +7 more

The triple comparison of (1) single-pulse spectral data, recorded with a CCD-equipped von Hámos spectrometer both axially and transversely; (2) axially measured time-integrated spectra registered on a film and (3) single-pulse x-ray images of the morphology of the self-trapped plasma channel, recorded simultaneously with the single-pulse spectra, establishes several leading characteristics of the saturated amplification observed on the Xe 35+ transition array at λ ≅ 2.86 Å. The chief findings are (α) absolute positive correlation of amplification with the formation of a plasma channel, (β) a perfect spectral match of the amplified transitions in the comparison of axially recorded single-pulse and time-integrated film data and (γ) exact spectral correspondence of both the axially registered single-pulse and time-integrated film data with single-pulse transversely measured spectra exhibiting deep spectral hole burning at the position of the Xe 35+ array.