Evolutionary algorithm-assisted design of a UV SHG cavity with elliptical focusing to avoid crystal degradation

Preißler, Daniel; Kiefer, Daniel; Führer, Thorsten; Walther, Thomas

doi:10.1007/s00340-019-7333-6

Cited by 3 publications

(5 citation statements)

References 24 publications

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“…Thus, in order to reach even higher UV powers the rather tight focusing of the cavity (16 µ m in non-walk-off direction and 271 µm in walk-off direction) has to be relaxed by changing the mirror geometry. This can be easily done using the design procedure described in [13]. Therefore, the combination of the elliptical focusing setup and heating of the crystal will enable producing low-cost high power CW UV laser light using off-the-shelf crystals.…”

Section: Discussionmentioning

confidence: 99%

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Non-degrading CW UV generation in β-barium borate at 257 nm using an elliptical focusing enhancement cavity

Kiefer¹,

Preißler²,

Führer³

et al. 2019

Laser Phys. Lett.

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With a combination of an elevated temperature for the β-barium borate (BBO) crystal and an elliptical focusing cavity we succeeded in eliminating the degradation in BBO during second harmonic generation into the ultraviolet (UV). We were capable of generating over 600 mW continuous-wave UV light at 257 nm with an off-the-shelf crystal for over 8 h without any sign of degradation. Our results indicate that the degradation is caused by color centers generated by two-photon absorption (TPA) strongly increasing the absorption of the fundamental radiation. While the higher crystal temperature reduces the TPA coefficient and the life time of the color centers, elliptical focusing strongly reduces the peak irradiance of the fundamental and thus its absorption.

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Section: Discussionmentioning

confidence: 99%

“…A detailed description of the exact design process can be found in [13]. In brief, we used [16] to find an elliptical beam waist in the BBO crystal involving a threefold lower peak irradiance of the fundamental and a 34% higher singlepass conversion efficiency than in the spherical focusing case.…”

Section: Elliptical Focusing Cavitymentioning

confidence: 99%

Non-degrading CW UV generation in β-barium borate at 257 nm using an elliptical focusing enhancement cavity

Kiefer¹,

Preißler²,

Führer³

et al. 2019

Laser Phys. Lett.

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“…The continuous wave laser radiation in the UV range is often realized due to nonlinear effects such as four-wavelength mixing or SHG [ 194 ]. ANNs speed up optimization of genetic algorithms and store sample information that can be easily generalized to other samples with minimal additional training [ 195 ].…”

Section: Nlo Processes Analyzed With MLmentioning

confidence: 99%

A Framework for Biosensors Assisted by Multiphoton Effects and Machine Learning

et al. 2022

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The ability to interpret information through automatic sensors is one of the most important pillars of modern technology. In particular, the potential of biosensors has been used to evaluate biological information of living organisms, and to detect danger or predict urgent situations in a battlefield, as in the invasion of SARS-CoV-2 in this era. This work is devoted to describing a panoramic overview of optical biosensors that can be improved by the assistance of nonlinear optics and machine learning methods. Optical biosensors have demonstrated their effectiveness in detecting a diverse range of viruses. Specifically, the SARS-CoV-2 virus has generated disturbance all over the world, and biosensors have emerged as a key for providing an analysis based on physical and chemical phenomena. In this perspective, we highlight how multiphoton interactions can be responsible for an enhancement in sensibility exhibited by biosensors. The nonlinear optical effects open up a series of options to expand the applications of optical biosensors. Nonlinearities together with computer tools are suitable for the identification of complex low-dimensional agents. Machine learning methods can approximate functions to reveal patterns in the detection of dynamic objects in the human body and determine viruses, harmful entities, or strange kinetics in cells.

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“…Elliptical focusing inside the crystal leads to much smaller peak intensities while still maintaining a high conversion efficiency. By using a design process employing evolutionary algorithms described in [23], a novel enhancement cavity was designed that allowed maintaining high UV powers over hours of operation [22]. We were able to utilize the very same design in our experiment.…”

Section: Increase In Powermentioning

confidence: 99%

“…We were able to utilize the very same design in our experiment. Therefore, we refer to previous publications [22,23] for further details about the enhancement cavity.…”

Section: Increase In Powermentioning

confidence: 99%

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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Evolutionary algorithm-assisted design of a UV SHG cavity with elliptical focusing to avoid crystal degradation

Cited by 3 publications

References 24 publications

Non-degrading CW UV generation in β-barium borate at 257 nm using an elliptical focusing enhancement cavity

Non-degrading CW UV generation in β-barium borate at 257 nm using an elliptical focusing enhancement cavity

A Framework for Biosensors Assisted by Multiphoton Effects and Machine Learning

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

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Evolutionary algorithm-assisted design of a UV SHG cavity with elliptical focusing to avoid crystal degradation

Cited by 3 publications

References 24 publications

Non-degrading CW UV generation in β-barium borate at 257 nm using an elliptical focusing enhancement cavity

Non-degrading CW UV generation in β-barium borate at 257 nm using an elliptical focusing enhancement cavity

A Framework for Biosensors Assisted by Multiphoton Effects and Machine Learning

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

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Product

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