Real-time dispersion analyzer of femtosecond laser pulses with use of a spectrally and temporally resolved upconversion technique

Rhee, JK; Sosnowski, T.; Tien, An-Chun; Norris, Theodore B.

doi:10.1364/josab.13.001780

Cited by 58 publications

(29 citation statements)

References 12 publications

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“…In recent years a number of techniques of indirect phase and pulse-shape retrieval have been proposed [67][68][69][70][71][72][73][74][75][76][77][78]. For instance, in various implementations of frequency-resolved optical gating (FROG, see for example [71][72][73]) a spectrally dispersed signal of autocorrelation-type is recorded.…”

Section: Measurement Of Spectral Phasementioning

confidence: 99%

All-solid-state cavity-dumped sub-5-fs laser

Baltuška¹,

Zheng²,

Pshenichnikov³

et al. 1997

Applied Physics B: Lasers and Optics

159

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Section: Measurement Of Spectral Phasementioning

confidence: 99%

All-solid-state cavity-dumped sub-5-fs laser

Baltuška¹,

Zheng²,

Pshenichnikov³

et al. 1997

Applied Physics B: Lasers and Optics

159

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“…We also used the STRUT (spectrally and temporally resolved up-conversion technique [13]) to characterize the pulses. Like the FROG (frequency resolved optical gating [14]) and SPIDER (spectral phase interferometry for direct electric-field recovery) [15], the STRUT is a measurement technique that allows recovery of the phase and amplitude of laser pulses.…”

Section: Propagation Of Complex Laser Pulses In Optically Dense Mediamentioning

confidence: 99%

“…(5), along with some nonrestrictive assumptions, it can be shown that the full phase and amplitude information of E͑v͒ can be recovered [13].…”

Section: Propagation Of Complex Laser Pulses In Optically Dense Mediamentioning

confidence: 99%

Propagation of Complex Laser Pulses in Optically Dense Media

et al. 1999

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Ultrafast laser pulses with complex envelopes (amplitude and frequency modulated) are used to excite an optically dense column of rubidium vapor. Pulse reshaping, stimulated emission dynamics, and residual electronic excitation in the Rb vapor are all shown to depend strongly on the laser pulse shape. Pulses that produce adiabatic passage in the optically thin limit exhibit more complex behavior in optically thick samples, including an unexpected dependence on the sign of the frequency sweep. Numerical solutions of the Maxwell-Bloch equations are shown to account for our results.[S0031-9007(99)09123-1] PACS numbers: 42.62.Fi, 32.70.Jz, 42.65.Re In recent years, it has become apparent that optical pulse shaping alters excitation dynamics in atomic and molecular systems [1,2]. Some similar effects have been known for decades both in nuclear magnetic resonance and in magnetic resonance imaging, where the technology to tailor radiofrequency pulses has been used routinely for several decades [3]. For the case of laser-matter interactions, however, the combination of optical density and wave packet dynamics also leads to completely new physical phenomena, which are just beginning to be explored as the technology for optical pulse shaping matures [4].Here, we use pulse shaping technology to make complex phase-and amplitude-modulated picosecond laser pulses with sufficient intensity to leave the linear-response regimes, and we apply such pulses to optically dense samples of Rb vapor. In the absence of optical density effects, the pulse shapes we apply [field envelope proportional to sech͑at͒ ͑11mi͒ , or equivalently a sech pulse envelope with a tanh frequency sweep] are predicted to give complete, bandwidth limited inversion [5]. For an optically dense sample, however, we report different dynamics that depend upon the input pulse shape. These results may be of practical importance in preparing spinpolarized noble gases, the only reagents commercially prepared today using laser systems [6].The coupled Maxwell-Bloch (MB) equations describe both the evolution of a material system and the reshaping of the laser pulses as they propagate through an optically dense medium [7]. This system of equations combines Maxwell's wave equation with Bloch's quantum-mechanical description of the field-matter interaction and are writtenHere, E͑ z , t͒ is the electric field, which is a function of three spatial coordinates, represented by the vector z , and of time, g͑D͒ is the inhomogeneous line shape at resonance offset D, p͑ z , t, D 0 ͒ is the polarization, T 2 and T 1 are the coherence and population lifetimes, respectively, and w͑ z , t, D 0 ͒ is the population difference. We used recursive algorithms developed in [8,9] to solve the MB equations numerically.The hyperbolic secant pulse with a hyperbolic tangent frequency sweep (sech) mentioned above is an analytical solution to the Bloch equations [5] and has received a great deal of attention [5,7,8] due to its success at inducing complete bandwidth limited inversions in material sy...

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“…Unlike other pulse diagnostics [23][24][25][26][27][28][29][30][31][32], FROG does not require splitting of auxiliary laser beams and pre-fabrication of reference pulses. This fact is a great practical advantage, since the set-up complexity in many spectroscopic experiments is already quite high [33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%