Generation and propagation of high-order harmonics in crystals

被引：183

作者：

Ghimire, Shambhu ^{[1
]}

DiChiara, Anthony D. ^{[2
]}

Sistrunk, Emily ^{[2
]}

Ndabashimiye, Georges ^{[1
]}

Szafruga, Urszula B. ^{[2
]}

Mohammad, Anis ^{[3
]}

Agostini, Pierre ^{[2
]}

DiMauro, Louis F. ^{[2
]}

Reis, David A. ^{[1
,4
,5
]}

机构：

[1] SLAC Natl Accelerator Lab, Stanford PULSE Inst, Menlo Pk, CA 94025 USA

[2] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[3] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

[4] Stanford Univ, Dept Photon Sci, Stanford, CA 94305 USA

[5] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW A | 2012年 / 85卷 / 04期

关键词：

IONIZATION; PULSES; PLASMA;

D O I：

10.1103/PhysRevA.85.043836

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The observation of nonperturbative high-order-harmonic generation in periodic solids has been interpreted in terms of a two step process comprising tunnel ionization and radiation from electrons undergoing frequency modulated Bloch oscillations in a strong laser field [Ghimire et al., Nat. Phys. 7, 138 (2011)]. Here we extend the model to include propagation effects. We show that the predicted efficiency is limited by phase velocity mismatch for emission below the band gap and by absorption above the band gap. The efficiency of harmonics scales with the square of the carrier density, suggesting that direct seeding could lead to higher yield. The emitted harmonics should have a temporal profile consisting of a train of subcycle pulses with duration on the order of 650 as depending on the crystal thickness.

引用

页数：6

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