Mr. Martin Wolferstetter Profile

Martin Wolferstetter

at Menlo Systems GmbH

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Publications (2)

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Proceedings Article | 5 March 2021 Presentation

Comb-assisted ultrastable laser system for quantum technologies

Michele Giunta, Martin Wolferstetter, Nikolai Lilienfein, Simon Holzberger, Sarah Saint-Jalm, Maurice Lessing, Marc Fischer, Ronald Holzwarth

Proceedings Volume 11700, 1170037 (2021) https://doi.org/10.1117/12.2582549

KEYWORDS: Quantum computing, Laser systems engineering, Chemical species, Laser stabilization, Computing systems, Strontium, Laser applications, Control systems, Clocks, Sensors

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Quantum technologies are nowadays emerging as enabling tools for practical applications, such as quantum sensing, quantum computing and quantum metrology. Lasers play a central role in many of these technological platforms, e.g. for atomic clocks, ion-based or neutral atom-based quantum computers or atom interferometers. Here we present a complete laser system to cool, trap and control strontium atoms in an optical lattice or in tweezer arrays. A sub-Hz linewidth master laser, locked to a high-finesse optical cavity provides the frequency reference for an ultra-low noise comb. The rack-mounted laser system consists of all cooling, repumping, and clock lasers stabilized to the optical frequency comb. Each of the involved laser frequencies can therefore be tuned and mapped in the frequency domain with a high degree of stability. The system is controlled via a software interface, allowing to operate the cold-atom-based physics package autonomously. The system is tailored for the operation of 88Sr or 87Sr optical lattice clocks, or for quantum computing applications, but other sub-Hz lasers could be obtained by phase locking additional clock laser frequencies to the ultra-stable comb, enabling convenient and accurate optical frequency ratio measurements. The laser system architecture and the relevant characterization measurements will be presented, proposing some user-cases such as quantum computing and atom interferometry on strontium atoms. This represents a technological leap for quantum optics, allowing to explore further applications of quantum sensors outside a traditional lab.

Proceedings Article | 30 March 2020 Presentation + Paper

Compact, high-speed sampling engine for pulsed femtosecond lasers

Milan Oeri, Ole Peters, Martin Wolferstetter, Ronald Holzwarth

Proceedings Volume 11348, 1134808 (2020) https://doi.org/10.1117/12.2558423

KEYWORDS: Ultrafast phenomena, Picosecond phenomena, Modulation, Spectroscopy, Terahertz spectroscopy, Actuators, Oscillators, Mode locking

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In the evolution of ultrafast spectroscopy and time-resolved measurements, in particular terahertz time-domain systems (THz-TDS), the demand for high-speed delay engines increases. Applications in scientific and industrial environments involve material science, high-resolution spectroscopy and non-destructive testing. Where ultra-fast techniques become crucial to reduce the acquisition time, mechanical or acousto-optic delay lines are limiting factors. Optical sampling methods are able to overcome these restrictions, by eliminating downsides of mechanical delay lines, such as comparably low scan speeds of tens of Hz. Different technical approaches have been developed to obtain two synchronized, temporally delayed femtosecond pulse trains without using a conventional, mechanical delay line. Common optical sampling techniques employ either a single oscillator or come as twin oscillator systems. The asynchronous optical sampling technique (ASOPS) has proven to enable high scan speeds and high-resolution spectroscopy. Two femtosecond fiber lasers are synchronized by locking electronics and operate in a controlled repetition rate offset state. We have established such dual-laser based systems and integrated them into fully fiber-coupled THz-TDS systems for the scientific community already. Optical sampling by cavity tuning (OSCAT) addresses higher costs that come with dual-laser systems using a single oscillator albeit one with a variable pulse repetition rate. We present a new engine based on the electronically controlled optical sampling principle (ECOPS) - but 10 times faster than achievable with conventional piezo-electric (PZT) based systems. We introduce an optical sampling engine (OSE) bringing ultra-fast, time-resolved measurements to 10 kHz - with unprecedented compactness of 19” 3U.

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