High-power tunable single-frequency 461 nm generation from an intracavity doubled Ti:sapphire laser with PPKTP

Li, Fengqin; Li, Huijuan; Lu, Huadong; Peng, Kunchi

doi:10.1088/1054-660x/26/2/025802

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…An alternative possibility would be the use of a Ti:sapphire laser employing intracavity frequency doubling. Setups like these demonstrated output powers of 1 W in the blue spectral range [30], although here thermal lenses are the limiting factor, too.…”

Section: Resonant Frequency Doubling Employing Ppktpmentioning

confidence: 98%

On identifying critical parameters in an amplification without inversion setup in mercury ^*

Preißler

Eizenhöfer

Gumm

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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Lasing without inversion is a compelling method based on the generation of coherences between atomic levels in order to produce UV radiation. While the proof-of-principle of this scheme has been shown for several decades, so far no radiation at a significant shorter wavelength than the necessary drive fields has been observed. In a recent publication Rein et al. (Phys Rev. A 105 (2022) 023722) have made experimental progress towards this goal. In this paper, we investigate the necessary improvements to their setup and discuss the experimental steps taken to achieve those goals. Specifically, we report on the improvement with respect to the laser sources.

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Section: Resonant Frequency Doubling Employing Ppktpmentioning

confidence: 98%

On identifying critical parameters in an amplification without inversion setup in mercury ^*

Preißler

Eizenhöfer

Gumm

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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“…However, they have not shared the material making up the SHG crystal. With the development of quasi-phase matching technology, periodically poled KTiOPO 4 (PPKTP) crystals have been widely used in blue light frequency doubling technology due to its advantages of high nonlinear coefficient and high damage threshold [38][39][40][41][42]. In 2003, Schwedes et al of the Max Planck Institute of Quantum Optics in Germany, using a 20 mm long PPKTP crystal, created a 461 nm laser with an output power of 205 mW and a conversion efficiency of 40% [43].…”

Section: Introductionmentioning

confidence: 99%

382 mW External-Cavity Frequency Doubling 461 nm Laser Based on Quasi-Phase Matching

Chen,

Zhao,

Tan

et al. 2023

Photonics

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To rapidly improve strontium optical clocks, a high-power, high-efficiency, and high-beam-quality 461 nm laser is required. In blue lasers based on periodically poled KTiOPO4 crystals, the optical absorption in the crystals can induce thermal effects, which must be considered in the design of high-efficiency external-cavity frequency doubling lasers. The interdependence between the absorption and the thermally induced quasi-phase mismatch was taken into account for the solution to the coupled wave equations. By incorporating multilayer crystal approximation, a theoretical model was developed to accurately determine the absorption of the frequency doubling laser. Based on experimental parameters, the temperature gradient in the crystal, the influence of the boundary temperature on the conversion efficiency, and the focal length of the thermal lens were simulated. Theoretical calculations were employed to optimize the parameters of the external-cavity frequency doubling experiment. In the experiment, in a bow-tie external cavity was demonstrated by pumping a 10 mm long periodically poled KTiOPO4 crystal with a 922 nm laser, a 461 nm laser with a maximum output power of 382 mW. The conversion efficiency of the incident fundamental laser was 66.2%. The M2 factor of the frequency doubling beam was approximately 1.4.

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“…For example, there are high-power, tunable sources in the 900-940 nm region based upon e.g. Ti:sapphire lasers [24] or neodymium-doped fibre [25], the latter of which can produce Watt-level light in the region 915-937 nm. These systems, however, are complex and typically necessitate a large footprint and expense.…”

Section: Introductionmentioning

confidence: 99%

Watt-level blue light for precision spectroscopy, laser cooling and trapping of strontium and cadmium atoms

Tinsley,

Bandarupally,

Penttinen

et al. 2021

Preprint

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High-power and narrow-linewidth laser light is a vital tool for atomic physics, being used for example in laser cooling and trapping and precision spectroscopy. Here we produce Watt-level laser radiation at 457.49 nm and 460.86 nm of respective relevance for the cooling transitions of cadmium and strontium atoms. This is achieved via the frequency doubling of a kHz-linewidth vertical-external-cavity surface-emitting laser (VECSEL), which is based on a novel gain chip design enabling lasing at > 2 W in the 915-928 nm region. Following an additional doubling stage, spectroscopy of the 1 𝑆 0 → 1 𝑃 1 cadmium transition at 228.89 nm is performed on an atomic beam, with all the transitions from all eight natural isotopes observed in a single continuous sweep of more than 4 GHz in the deep ultraviolet. The absolute value of the transition frequency of 114 Cd and the isotope shifts relative to this transition are determined, with values for some of these shifts provided for the first time.

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High-power tunable single-frequency 461 nm generation from an intracavity doubled Ti:sapphire laser with PPKTP

Cited by 5 publications

References 20 publications

On identifying critical parameters in an amplification without inversion setup in mercury ^*

On identifying critical parameters in an amplification without inversion setup in mercury ^*

382 mW External-Cavity Frequency Doubling 461 nm Laser Based on Quasi-Phase Matching

Watt-level blue light for precision spectroscopy, laser cooling and trapping of strontium and cadmium atoms

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High-power tunable single-frequency 461 nm generation from an intracavity doubled Ti:sapphire laser with PPKTP

Cited by 5 publications

References 20 publications

On identifying critical parameters in an amplification without inversion setup in mercury *

On identifying critical parameters in an amplification without inversion setup in mercury *

382 mW External-Cavity Frequency Doubling 461 nm Laser Based on Quasi-Phase Matching

Watt-level blue light for precision spectroscopy, laser cooling and trapping of strontium and cadmium atoms

Contact Info

Product

Resources

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On identifying critical parameters in an amplification without inversion setup in mercury ^*

On identifying critical parameters in an amplification without inversion setup in mercury ^*