Generation of Isolated Attosecond Pulses with 20 to 28 Femtosecond Lasers

Abstract

Isolated attosecond pulses are powerful tools for exploring electron dynamics in matter. So far, such extreme ultraviolet pulses have only been generated using high power, few-cycle lasers, which are very difficult to construct and operate. We propose and demonstrate a technique called generalized double optical gating for generating isolated attosecond pulses with 20 fs lasers from a hollow-core fiber and 28 fs lasers directly from an amplifier. These pulses, generated from argon gas, are measured to be 260 and 148 as by reconstructing the streaked photoelectron spectrograms. This scheme, with a relaxed requirement on laser pulse duration, makes attophysics more accessible to many laboratories that are capable of producing such multicycle laser pulses.

Reconstruction of an excited-state molecular wave packet with attosecond transient absorption spectroscopy

“…Broadband VUV pulses with spectrum supporting a transform-limited pulse duration of 750 asec, which were generated using the generalized double optical gating technique [28] in lowpressure xenon gas (typically 1-5 mbar) and synchronized few-cycle NIR laser pulses with a variable time delay were combined with a hole-drilled mirror and focused together into a second quasistatic gas cell (inner diameter 1.5 mm) filled with ∼20 mbar of H 2 gas. The peak intensity of the NIR laser was ∼5 × 10 12 W/cm 2 .…”

Combined Focusing and Flat-Field Spectrometer System for Extreme Ultraviolet Pulse

“…Since then, an attosecond research upsurge is overwhelmingly rising from physics, chemistry and materials science to even information processing and other fields [2]- [12]. So far, the world record of the shortest pulse is 67 as [10].…”

Effect of nonlinear chirped Gaussian laser pulse on plasma wake field generation

“…[1][2][3][4][5][6][7][8] Lots of developments of ultrashort high power lasers have been carried out with progress in ultrashort laser technologies such as chirped pulse amplification. [9][10][11][12][13] The interaction of an intense short laser pulse with under dense plasma can produce accelerating gradients, thousands of times, higher than conventional accelerators. [14][15][16] Plasma wake can travel at the group velocity of laser pulse, close to the speed of light, in order to accelerate particles up to relativistic velocities.…”