Highly coherent, watt-level deep-UV radiation via a frequency-quadrupled Yb-fiber laser system

Burkley, Zakary; Brandt, Adam; Rasor, Cory; Cooper, Samuel

doi:10.1364/ao.58.001657

Cited by 26 publications

(23 citation statements)

References 28 publications

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“…In this work, we design, construct and characterize a frequency quadrupled DUV system as a first step toward the laser cooling and trapping of aluminum monochloride (AlCl) for future studies of strongly interacting ultracold dipolar gases. Through frequency quadrupling an amplified seed laser at 1046 nm, we realize as much as ∼2.75 W at 261.5 nm and show a stable steady state power of ∼2 W over 13 hours, furthering prior demonstrations of the power scalability of this laser system [14][15][16]. We present details for design choices alongside system performance and use this laser to perform the first spectroscopy on the AlCl A 1 Π state hyperfine structure using a cold, slow molecular beam.…”

Section: Introductionsupporting

confidence: 58%

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A stable 2 W continuous-wave 261.5 nm laser for cooling and trapping aluminum monochloride

Shaw,

Hannig,

McCarron

2021

Preprint

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We present a high-power tunable deep-ultraviolet (DUV) laser that uses two consecutive cavity enhanced doubling stages with LBO and CLBO crystals to produce the fourth harmonic of an amplified homebuilt external cavity diode laser. The system generates up to 2.75 W of 261.5 nm laser light with a ∼2 W stable steady-state output power and performs second harmonic generation in a largely unexplored high intensity regime in CLBO for continuous wave DUV light. We use this laser to perform fluorescence spectroscopy on the 1 Σ ← 1 Π transition in a cold, slow beam of AlCl molecules and probe the A 1 Π | ′ = 0, ′ = 1 state hyperfine structure for future laser cooling and trapping experiments. This work demonstrates that the production of tunable, watt-level DUV lasers is becoming routine for a variety of wavelength-specific applications in atomic, molecular and optical physics.

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Section: Introductionsupporting

confidence: 58%

“…Successive stages of second harmonic generation (SHG) then offer a route to coherent and tunable wattlevel DUV production between ∼200-275 nm. Recently, others have shown this approach to be capable on ∼ 1 W of stable light at 243 nm and 244 nm [14,15].…”

Section: Introductionmentioning

confidence: 99%

A stable 2 W continuous-wave 261.5 nm laser for cooling and trapping aluminum monochloride

Shaw,

Hannig,

McCarron

2021

Preprint

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“…Also, the output power of the UV lasers can be improved: a 243 nm laser with up to 1.4 W output power in continues-wave mode has been demonstrated [4]. The 306 nm laser in our experiment is generated by second-harmonic generation from a 612 nm laser, which is generated by sum-frequency generation of 1550 nm and 1010 nm lasers.…”

Section: Gate Error Analysis and Scalingmentioning

confidence: 82%

“…Trapped ions are among the most accurately controlled and best isolated quantum systems [1] with low-error entanglement gates operated via the vibrational motion of a few-ion crystal within tens of microseconds [2]. To exceed the level of complexity tractable by classical computers the main challenge is to realise fast entanglement operations in large ion crystals [3,4]. The strong dipole-dipole interactions in polar molecule [5] and Rydberg atom [6,7] systems allow much faster entangling gates, yet stable state-independent confinement comparable with trapped ions needs to be demonstrated in these systems [8].…”

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confidence: 99%

Submicrosecond entangling gate between trapped ions via Rydberg interaction

Zhang

Pokorny

et al. 2020

Nature

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Generating quantum entanglement in large systems on time scales much shorter than the coherence time is key to powerful quantum simulation and computation. Trapped ions are among the most accurately controlled and best isolated quantum systems [1] with low-error entanglement gates operated via the vibrational motion of a few-ion crystal within tens of microseconds [2]. To exceed the level of complexity tractable by classical computers the main challenge is to realise fast entanglement operations in large ion crystals [3,4]. The strong dipole-dipole interactions in polar molecule [5] and Rydberg atom [6,7] systems allow much faster entangling gates, yet stable state-independent confinement comparable with trapped ions needs to be demonstrated in these systems [8]. Here, we combine the benefits of these approaches: we report a 700 ns two-ion entangling gate which utilises the strong dipolar interaction between trapped Rydberg ions and produce a Bell state with 78% fidelity. The sources of gate error are identified and a total error below 0.2% is predicted for experimentally-achievable parameters. Furthermore, we predict that residual coupling to motional modes contributes ∼ 10 −4 gate error in a large ion crystal of 100 ions. This provides a new avenue to significantly speed up and scale up trapped ion quantum computers and simulators. Trapped atomic ions are one of the most promising architectures for realizing a universal quantum computer [1]. The fundamental single-and two-qubit quantum gates have been demonstrated with errors less than 0.1% [2], sufficiently low for fault-tolerant quantum errorcorrection schemes [10]. Nevertheless, a scalable quantum computer requires a large number of qubits and a large number of gate operations to be conducted within the coherence time.Most established gate schemes using a common motional mode are slow (typical gate times are between 40 and 100 µs) and difficult to scale up since the motional spectrum becomes more dense with increasing ion number. Many new schemes have been proposed [11][12][13][14], with the fastest experimentally-achieved gate being 1.6 µs (99.8% fidelity) and 480 ns (60% fidelity) [15], realised by driving multiple motional modes simultaneously. Although the gate speed is not limited by the trap frequencies, the gate protocol requires the phase-space trajectories of all modes to close simultaneously at the end of the pulse sequence [15]. In long ion strings with a large number of vibrational modes, it becomes increasingly challenging to find and implement laser pulse parameters that execute this gate with a low error. Thus, a slow-down of gate speed appears inevitable.Two-qubit entangling gates in Rydberg atom systems are substantially faster, owing to strong dipole-dipole interactions. The gate fidelities in recent experiments using neutral atoms are fairly high [16,17]. However, the atom traps need to be turned off during Rydberg excitation. This can cause unwanted coupling between qubits and atom motion as well as atom loss [8,18]. Employing blue-detune...

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“…The increased atom-laser interaction time will compensate for the lower available power compared to a pulsed laser. These new converters combined with the recent demonstration of high-power CW lasers at 243/244 nm [35,36] that can be cavity enhanced to more than 33 W of intracavity power [37] will enable an improved measurement of the 1S-2S transition frequency by three orders of magnitude which is the aim of the ongoing Mu-MASS experiment.…”

Section: S-2s Transitionmentioning

confidence: 99%

Current status and prospects of muonium spectroscopy at PSI

Ohayon

Burkley

2021

SciPost Phys. Proc.

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Recent and ongoing developments of low energy muon beamlines are heralding a new era of precision Muonium spectroscopy. While past spectroscopic measurements of Muonium were performed at pulsed muon facilities and were statistically limited, the advent of continuous low energy muon beams, such as at the LEM beamline at PSI, paired with the development of efficient muon-muonium converters and laser advancements, will overcome these limitations. Current experiments presently underway at the LEM facility and in the near future at the muCool beamline, which is under development at PSI, aim to improve the precision of both the 1S-2S transition determination and Lamb shift by several orders of magnitude. In this Chapter we give an overview of the current status and future prospects of these activities at PSI, highlighting how their projected significance fits into a broader context of other ongoing efforts worldwide.

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Highly coherent, watt-level deep-UV radiation via a frequency-quadrupled Yb-fiber laser system

Cited by 26 publications

References 28 publications

A stable 2 W continuous-wave 261.5 nm laser for cooling and trapping aluminum monochloride

A stable 2 W continuous-wave 261.5 nm laser for cooling and trapping aluminum monochloride

Submicrosecond entangling gate between trapped ions via Rydberg interaction

Current status and prospects of muonium spectroscopy at PSI

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