Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals

Floery, Tobias; Stummer, Vinzenz; Pupeikis, Justinas; Willenberg, Benjamin; Nussbaum-Lapping, Alexander; Kaksis, Edgar; Camargo, Franco V. A.; Barkauskas, Martynas; Phillips, Christopher; Keller, U.; Cerullo, Giullio; Pugžlys, Audrius; Baltuška, Andrius

doi:10.34133/ultrafastscience.0027

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…The integrator and piezo-actuator in the Ti:Sa oscillator close the feedback loop just as in synchronization mode B. The same can be achieved much more precisely – albeit with severe constraints on the laser system and repetition rates, with dual-comb lasers, which have very recently been used to produce amplified fs-pulses at arbitrary delay …”

Section: Methodsmentioning

confidence: 99%

“…The same can be achieved much more precisely − albeit with severe constraints on the laser system and repetition rates, with dual-comb lasers, which have very recently been used to produce amplified fs-pulses at arbitrary delay. 47 Figure 4c, red, shows the pump−probe response of the Siwafer measured in this configuration. The standard deviation of 3.2 ps is about the same as in synchronization mode B.…”

Section: Synchronization Mode Bmentioning

confidence: 99%

“…A very interesting alternative is arbitrary-detuning asynchronous optical sampling (ADASOPS). − The separation t osc between pulses from two independent oscillators is continuously changing, but can be measured, and pairs of pump and probe pulses with the desired time-delay can be selected for amplification. Particularly interesting in this regard is ref , which showed how to measure the time-delay purely electronically, thereby minimizing the complexity of the optical part of the setup.…”

Section: Introductionmentioning

confidence: 99%

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Versatile Femtosecond Laser Synchronization for Multiple-Timescale Transient Infrared Spectroscopy

Helbing

Hamm

2023

J. Phys. Chem. A

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Several ways to electronically synchronize different types of amplified femtosecond laser systems are presented based on a single freely programmable electronics hardware: arbitrary-detuning asynchronous optical sampling (ADASOPS), as well as actively locking two femtosecond laser oscillators, albeit not necessarily to the same round-trip frequency. They allow us to rapidly probe a very wide range of timescales, from picoseconds to potentially seconds, in a single transient absorption experiment without the need to move any delay stage. Experiments become possible that address a largely unexplored aspect of many photochemical reactions, in particular in the context of photo-catalysis as well as photoactive proteins, where an initial femtosecond trigger very often initiates a long-lasting cascade of follow-up processes. The approach is very versatile and allows us to synchronize very different lasers, such as a Ti:Sa amplifier and a 100 kHz Yb-laser system. The jitter of the synchronization, and therewith the time-resolution in the transient experiment, lies in the range from 1 to 3 ps, depending on the method. For illustration, transient IR measurements of the excited state solvation and decay of a metal carbonyl complex as well as the full reaction cycle of bacteriorhodopsin are shown. The pros and cons of the various methods are discussed, with regard to the scientific question one might want to address, and also with regard to the laser systems that might be already existent in a laser lab.

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Section: Methodsmentioning

confidence: 99%

Section: Synchronization Mode Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Versatile Femtosecond Laser Synchronization for Multiple-Timescale Transient Infrared Spectroscopy

Helbing

Hamm

2023

J. Phys. Chem. A

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Gigahertz semiconductor laser at a center wavelength of 2 µm in single and dual-comb operation

Gaulke,

Heidrich,

Huwyler

et al. 2023

Opt. Express

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Dual-comb lasers are a new class of ultrafast lasers that enable fast, accurate and sensitive measurements without any mechanical delay lines. Here, we demonstrate a 2-µm laser called MIXSEL (Modelocked Integrated eXternal-cavity Surface Emitting Laser), based on an optically pumped passively modelocked semiconductor thin disk laser. Using III-V semiconductor molecular beam epitaxy, we achieve a center wavelength in the shortwave infrared (SWIR) range by integrating InGaSb quantum well gain and saturable absorber layers onto a highly reflective mirror. The cavity setup consists of a linear straight configuration with the semiconductor MIXSEL chip at one end and an output coupler a few centimeters away, resulting in an optical comb spacing between 1 and 10 GHz. This gigahertz pulse repetition rate is ideal for ambient pressure gas spectroscopy and dual-comb measurements without requiring additional stabilization. In single-comb operation, we generate 1.5-ps pulses with an average output power of 28 mW, a pulse repetition rate of 4 GHz at a center wavelength of 2.035 µm. For dual-comb operation, we spatially multiplex the cavity using an inverted bisprism operated in transmission, achieving an adjustable pulse repetition rate difference estimated up to 4.4 MHz. The resulting heterodyne beat reveals a low-noise down-converted microwave frequency comb, facilitating coherent averaging.

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Rapid-Scan Nonlinear Time-Resolved Spectroscopy over Arbitrary Delay Intervals

Cited by 2 publications

References 22 publications

Versatile Femtosecond Laser Synchronization for Multiple-Timescale Transient Infrared Spectroscopy

Versatile Femtosecond Laser Synchronization for Multiple-Timescale Transient Infrared Spectroscopy

Gigahertz semiconductor laser at a center wavelength of 2 µm in single and dual-comb operation

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