Stimulated Raman scattering of light absorbing media excited by ultrashort laser pulses

The fluctuation-dissipation theory of spontaneous and stimulated vibration Raman scattering is worked out taking into account the dissipation losses at frequencies of laser pump and scattering radiation. General expressions are found, which describe the absolute intensities and shape, energy and duration of scattered pulses in terms of the parameters of the medium and the the input laser pulses. The general regularities are analyzed in detail. Conditions are found for the realization of spontaneous or stimulated Raman scattering and its dependence on absorption, pulse duration and other parameters of the problem

Experimental realization of a Coulomb blockade refrigerator

We present an experimental realization of a Coulomb blockade refrigerator (CBR) based on a single-electron transistor (SET). In the present structure, the SET island is interrupted by a superconducting inclusion to permit charge transport while preventing heat flow. At certain values of the bias and gate voltages, the current through the SET cools one of the junctions. The measurements follow the theoretical model down to ∼80 mK, which was the base temperature of the current measurements. The observed cooling increases rapidly with decreasing temperature, in agreement with the theory, reaching about a 15 mK drop at the base temperature. The CBR appears as a promising electronic cooler at temperatures well below 100 mK.Peer reviewe

Lyn Hejinian’s Writing. Poetic Language as Language of Inquiry

The article is devoted to the poetics of contemporary American writer Lyn Hejinian (1941–2024), considered one of the most consistent successors of Gertrude Stein's experimentalism in Anglophone literary writing. The study encompasses all stages of Hejinian’s poetic creativity: from early experiences of “language writing” in the 1960–70s, autobiographical texts and collective works of the 1980–90s, to theoretical and poetic quests in the first decades of the 21st century. The writer's main interest is the persistence and impermanence of memory and the subject, as well as the role of writing in their preservation and transformation. Descriptions of the writing process as a driving force of memory and experience come to the fore here. Syntax acts as the materialization of temporality in writing. Texts in a variety of formats explore natural and cultural worlds brought to life by language. Many of Hejinian's texts, both theoretical and artistic, explore the problem of language as a social space, as a philosophical search and as political pragmatics, as well as the problem of the relationship of time to language and language to time. The book The Language of Inquiry has become a kind of manifesto for poetic language, which is the “language of inquiry.” A special place in the book is occupied by essays about Gertrude Stein, which actualize the writing practices of the great American modernist in the contemporary context of language-oriented poetics. In her work of the recent years, Hejinian increasingly turns to social themes, never ceasing to experiment with the boundaries of the poetic. She puts forward a theory of so-called “allegorical activism,” which is understood as “artistic and political practice in the service of activating creative potential in everyday life.