Active and passive stabilization of a high-power violet frequency-doubled diode laser

Eismann, Ulrich; Enderlein, Martin; Simeonidis, Konstantinos; Keller, Felix; Rohde, Felix; Opalevs, Dmitrijs; Scholz, Matthias; Kaenders, Wilhelm; Stühler, J.

doi:10.1364/cleo_at.2016.jtu5a.65

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…The SH component shows an excess of noise in the acoustic band on a plateau at -105 dBc/Hz extending till 10 kHz, then it rolls off with a general 𝑓 −1 trend. The doubling process adds excess intensity noise in the whole Fourier frequency range, as already observed in previously published works based on resonant doubling cavities [24,25] but not in single pass systems [26]. The strong focusing of the fundamental mode on the crystal, imposed to obtain a high conversion efficiency, produces as a side-effect the multi-lobe cross-section of the frequency doubled beam, whose intensity is well described by a sinc 2 function; the central lobe of the output beam contains more than 90% of the power, and we correct its aspect ratio using two cylindrical lenses to improve the single mode fiber injection efficiency.…”

Section: Characterizationsupporting

confidence: 66%

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

Feng,

Vidal,

Robert

et al. 2021

Preprint

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A Watt-level continuous and single frequency blue laser at 461 nm is obtained by frequency-doubling an amplified diode laser operating at 922 nm via a LBO crystal in a resonant Fabry-Pérot cavity. We achieved a best optical conversion efficiency equal to 87% with more than 1 W output power in the blue, and limited by the available input power. The frequency-converted beam is characterized in terms of long term power stability, residual intensity noise, and geometrical shape. The blue beam has a linewidth of the order of 1 MHz, and we used it to magneto-optically trap 88 Sr atoms on the 5s 2 1 S 0 -5s5p 1 P 1 transition. The low-finesse, linear-cavity doubling system is very robust, insensitive to vibrations, and is compatible with a tenfold increase of the power levels which could be obtained with fully-fibered amplifiers and large mode area fibers.

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Section: Characterizationsupporting

confidence: 66%

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

Feng,

Vidal,

Robert

et al. 2021

Preprint

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“…However, the SFGs were limited by the optical coatings on the lithium niobite crystals which degraded over time and reduced the power of the seed laser and the performance of the SRWTL. More general advances in semiconductor amplifier and frequency-doubling technology expanded the operating range of tunable lasers based on external cavity diode lasers to more than 1000 mW power at yellow and orange wavelengths [18]. These developments resulted in the commercial development of tunable solid-state laser systems (e.g., DL-TA-SHG Pro, Toptica Photonics AG, Graefelfing, Germany).…”

Section: Introductionmentioning

confidence: 99%

Sodium Resonance Wind-Temperature Lidar at PFRR: Initial Observations and Performance

Williams

Alspach

et al. 2020

Atmosphere

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A narrowband sodium resonance wind-temperature lidar (SRWTL) has been deployed at Poker Flat Research Range, Chatanika, Alaska (PFRR, 65° N, 147° W). Based on the Weber narrowband SRWTL, the PFRR SRWTL transmitter was upgraded with a state-of-the-art solid-state tunable diode laser as the seed laser. The PFRR SRWTL currently makes simultaneous measurements in the zenith and 20° off-zenith towards the north with two transmitted beams and two telescopes. Initial results for both nighttime and daytime measurements are presented. We review the performance of the PFRR SRWTL in terms of seven previous and currently operating SRWTLs. The transmitted power from the pulsed dye amplifier (PDA) is comparable with other SRWTL systems (900 mW). However, while the efficiency of the seeding and frequency shifting is comparable to other SRWTLs the efficiency of the pumping is lower. The uncertainties of temperature and wind measurements induced by photon noise at the peak of the layer with a 5 min, 1 km resolution are estimated to be ~1 K and 2 m/s for nighttime conditions, and 10 K and 6 m/s for daytime conditions. The relative efficiency of the zenith receiver is comparable to other SRWTLs (90–97%), while the efficiency of the north off-zenith receiver needs further optimization. An upgrade of the PFRR SRWTL to a full three-beam system with zenith, northward and eastward measurements is in progress.

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“…Therefore, experiments require high intensities for the blue light (to compensate for the small transition dipole moments between low-lying and excited states) combined with narrow laser linewidths. A common approach involves the use of frequency-doubled semiconductor laser systems which can reach a wavelength tuning range of 8 nm, output powers < ∼ 1 W and locked laser linewidths < ∼ 200 kHz [40][41][42].…”

Section: A Introductionmentioning

confidence: 99%

Versatile, high-power 460 nm laser system for Rydberg excitation of ultracold potassium

et al. 2017

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We present a versatile laser system which provides more than 1.5 W of narrowband light, tunable in the range from 455-463 nm. It consists of a commercial Titanium-Sapphire laser which is frequency doubled using resonant cavity second harmonic generation and stabilized to an external reference cavity. We demonstrate a wide wavelength tuning range combined with a narrow linewidth and low intensity noise. This laser system is ideally suited for atomic physics experiments such as two-photon excitation of Rydberg states of potassium atoms with principal quantum numbers n > 18. To demonstrate this we perform two-photon spectroscopy on ultracold potassium gases in which we observe an electromagnetically induced transparency resonance corresponding to the 35s 1/2 state and verify the long-term stability of the laser system. Additionally, by performing spectroscopy in a magneto-optical trap we observe strong loss features corresponding to the excitation of s, p, d and higher-l states accessible due to a small electric field. A. IntroductionThe coupling of atomic systems with laser fields enables the extremely precise creation and study of model quantum systems, such as atom-light interactions [1], cavity quantum electrodynamics [2,3], optical atomic clocks [4,5], strongly correlated matter [6,7], and quantum simulators [8]. Success in these areas is largely attributed to the development of techniques such as laser cooling and trapping which have enabled an amazing level of control over essentially all ground state properties of ultracold atoms, including their atomic motion, spatial geometry, coherence and interaction properties. At the same time, the continuing development of new laser sources capable of spanning almost the complete wavelength range (from ultraviolet to infrared), have made it possible to achieve quantum control over the singleatom electronic properties of many atoms, including their highly excited Rydberg states. Laser control of Rydberg states provides a novel platform for quantum science and technology, including: probing surface fields [9-12], sensing using thermal vapours [13][14][15] One outstanding application of Rydberg atoms is to exploit strong light-matter interactions to realize new types of quantum fluids enhanced by long-range interactions (Rydberg dressing) [30][31][32][33][34][35][36][37][38]. The challenge lies in reaching a regime of strong Rydberg atom-light coupling while at the same time minimizing decoherence. Most cold atom experiments working with highly excited Rydberg states are realized using alkali atoms, in which the Rydberg state is accessed via a two-photon transition involving two laser fields (commonly in the infrared and blue wavelength ranges). In this case the relevant figure of merit for Rydberg dressing scales proportionally to the atom-light Figure 1. Schematic overview of the laser system and potassium level scheme used for two-photon Rydberg excitation. (a) The laser system consists of a Titanium-Sapphire laser and resonant-cavity frequency doubling (SHG). To imp...

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Active and passive stabilization of a high-power violet frequency-doubled diode laser

Cited by 4 publications

References 11 publications

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

Sodium Resonance Wind-Temperature Lidar at PFRR: Initial Observations and Performance

Versatile, high-power 460 nm laser system for Rydberg excitation of ultracold potassium

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