Attosecond active synchronization of passively mode-locked lasers by balanced cross correlation

Schibli, T. R.; Kim, J.; Kuzucu, Onur; Gopinath, Juliet T.; Tandon, S. N.; Petrich, G.S.; Kolodziejski, L. A.; Fujimoto, James G.; Ippen, Erich P.; Käertner, Franz X.

doi:10.1364/assp.2003.108

Cited by 36 publications

(48 citation statements)

References 8 publications

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“…For a properly chosen fixed delay Δt, depending on the duration of the input pulses, the dynamic range, in which the BOC signal is proportional to the pulse timing around τ ¼ 0, is maximized. First demonstrated as an active feedback technique in all-optical table-top laser synchronization [13], the two-color BOC method allows us to characterize the timing stability of the phase-locked FEL-table-top laser system.…”

Section: A Principle Of Balanced Optical Cross-correlationmentioning

confidence: 99%

“…This method, applied so far to optical lasers [13,14], allows access to the absolute delay between accelerator-based and table-top light pulses with fs-accuracy. In this paper, we demonstrate the BOC concept employing a fs table-top near-IR laser synchronized with an IR FEL at the Fritz Haber Institute (FHI) using a low-jitter radio-frequency phaselocking system.…”

Section: Introductionmentioning

confidence: 99%

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Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser

Kiessling

Colson

Gewinner

et al. 2018

Phys. Rev. Accel. Beams

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We experimentally demonstrate a single-shot arrival time monitor for short picosecond infrared freeelectron laser (IR FEL) pulses based on balanced optical cross-correlation with a synchronized fs table-top laser. Employing this timing tool at the Fritz Haber Institute IR FEL, we observe a shot-to-shot timing jitter of only 100 fs and minute-scale timing drifts of a few picoseconds, the latter being strictly correlated with the electron beam energy of the accelerator. We acquire sum-frequency cross-correlation data with micropulse resolution, providing full access to the IR FEL pulse shape evolution within the macropulse. These measurements provide unprecedented insights into the occurrence of limit-cycle oscillations of the FEL intensity as a consequence of subpulse formation. Our experimental results are complemented by fourdimensional simulations of the nonlinear pulse dynamics in a low-gain FEL oscillator based on MaxwellLorentz theory.

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Section: A Principle Of Balanced Optical Cross-correlationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser

Kiessling

Colson

Gewinner

et al. 2018

Phys. Rev. Accel. Beams

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show abstract

“…Coherent superposition of the Ti:sa laser pulses with the Cr:fo laser has been achieved due to the enhanced stability of their prismless cavities. The most important and critical step is long-term stable and tight synchronization of the repetition rates of both lasers [9] which has been achieved using a balanced cross-correlation technique (see Fig. 6).…”

Section: Generation Of Two-cycle Signal Pulses With Carrier-envelope mentioning

confidence: 99%

“…An analysis of the out-of-loop timing jitter following Ref. [9] shows that the rms jitter measured in a 2.3 MHz BW results in 380 as ±130 as, [ 10] a tenth of an optical cycle at the center wavelength of the joint Ti:sa-Cr:fo spectrum of -950 nm. This performance can be maintained over more than 12 hours of continued operation, which demonstrates the stability of the system.…”

Section: Generation Of Two-cycle Signal Pulses With Carrier-envelope mentioning

confidence: 99%

Few-cycle Optical Parametric Chirped Pulse Amplification

Käertner¹

2007

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden Over the last few years, ultrafast laser physics and frequency metrology has merged and provided us with unprecedented (sub-cycle) control over the electric field of few-cycle laser pulses emitted from modelocked lasers.These pulses and the corresponding technology are the prerequisite for high energy phase controlled few-cycle laser pulses, needed for reliable extreme ultraviolet (EUV) and soft x-ray production via high harmonic generation. It has been shown over the last few years that this technology leads to the generation of attosecond pulses and therefore opens up a new frontier in time and frequency measurements.The DURIP funding provided by AFOSR enabled us to buy the key components for the construction of phase controlled high energy optical parametric chirped pulse amplifiers that directly generate two-cycle optical pulses, i.e. l4fs at a center wavelength of 2Itm and later also of 5fs at 800nm at lkHz repetition rate without using external pulse compression. The major challenge is the construction of a high beam quality pump source and the dispersion compensation of the ultra wideband spectrum after amplification. We want to use this source for soft x-ray production via high harmonic harmonic generation (HHG) and later attosecond pulse generation. Furthermore, this system enables us to explore in the future few and single-cycle laser pulse generation over the wavelength range covering 700nm -2.6gtm. Unlike Ti:sapphire amplifiers, parametric amplification is not limited to a fixed wavelength range. Therefore, this system will enable us to explore few-cycle pulse generation from the visible to the far infrared enabling many experiments to come over the next years. In particular, this system once finalized over the next half year will be used in the DARPA funded project "Hyperspectral Radiography Sources using Cavity-Enhancement Techniques". One immediate experiment we want to explore is to study HHG as a function of the drive laser wavelength. It is expected that the cutoff wavelength of high harmonics scales as the square of the wavelength, because the wiggler energy of the freed electron scales with the wavelength at fixed intensity. This scaling, if successful, could allow the generation of keV radiation using high-order harmonic generation. Of course, many other yet unconsidered effects might change this simple scaling, such as higher absorption or larger phase mismatch at these higher frequencies scaling with the driver pulse wavelength. In the following, we describe in detail what has been accomplished over the last 1.5 years supported by the DURIP funding and the future...

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“…One method involves the use of fast photodiodes and a mixer with a high bandwidth (>10 GHz) to compare the phase of a higher harmonic of the two repetition frequencies, i.e., at 14 GHz [104,109]. Another method uses optically generated feedback signal [110]. The optical setup for this method is already implemented and used for the measurement presented in figure 4.5.…”

Section: Locking Of Two Mode-locked Laser Sourcesmentioning

confidence: 99%

Spectral phase shaping for non-linear spectroscopy and imaging

Postma

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Attosecond active synchronization of passively mode-locked lasers by balanced cross correlation

Cited by 36 publications

References 8 publications

Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser

Femtosecond single-shot timing and direct observation of subpulse formation in an infrared free-electron laser

Few-cycle Optical Parametric Chirped Pulse Amplification

Spectral phase shaping for non-linear spectroscopy and imaging

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