Development of an optimal laser for chirp cooling of positronium based on chirped pulse-train generator
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910414885879808 |
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| author | Shu, Kenji Miyamoto, Naoki Motohashi, Yuto Uozumi, Ryosuke Tajima, Yohei Yoshioka, Kosuke |
| author_facet | Shu, Kenji Miyamoto, Naoki Motohashi, Yuto Uozumi, Ryosuke Tajima, Yohei Yoshioka, Kosuke |
| contents | We report the development and characterization of a pulsed 243 nm laser that is optimal for the cooling of positronium (Ps). The laser, which is based on the recent chirped pulse-train generator (CPTG) demonstrated by K. Yamada et al. (Phys. Rev. Appl. 16, 014009 (2021)), was designed to output a train of pulses with linewidths of 10 GHz, and with the center frequency of each pulse shifting upward (up-chirped) in time by $4.9\times10^2\,\mathrm{GHz\,μs^{-1}}$. These parameters were determined by the mechanism of chirp cooling, which is the best scheme for cooling many Ps atoms to the recoil temperature of laser cooling. To achieve the designed performance, we drove an optical phase modulator in the CPTG with a deep modulation depth based on the operating principle of the cooling laser. Time-resolved spectroscopic measurements confirmed that the developed laser satisfied the chirp rate and linewidth requirements for efficient chirp cooling. Combined with pulse energy of hundreds of microjoules, we believe that the experimental demonstration of Ps laser cooling has become possible using realistic methods for the generation and velocity measurement of Ps. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_00877 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Development of an optimal laser for chirp cooling of positronium based on chirped pulse-train generator Shu, Kenji Miyamoto, Naoki Motohashi, Yuto Uozumi, Ryosuke Tajima, Yohei Yoshioka, Kosuke Optics High Energy Physics - Experiment Atomic Physics We report the development and characterization of a pulsed 243 nm laser that is optimal for the cooling of positronium (Ps). The laser, which is based on the recent chirped pulse-train generator (CPTG) demonstrated by K. Yamada et al. (Phys. Rev. Appl. 16, 014009 (2021)), was designed to output a train of pulses with linewidths of 10 GHz, and with the center frequency of each pulse shifting upward (up-chirped) in time by $4.9\times10^2\,\mathrm{GHz\,μs^{-1}}$. These parameters were determined by the mechanism of chirp cooling, which is the best scheme for cooling many Ps atoms to the recoil temperature of laser cooling. To achieve the designed performance, we drove an optical phase modulator in the CPTG with a deep modulation depth based on the operating principle of the cooling laser. Time-resolved spectroscopic measurements confirmed that the developed laser satisfied the chirp rate and linewidth requirements for efficient chirp cooling. Combined with pulse energy of hundreds of microjoules, we believe that the experimental demonstration of Ps laser cooling has become possible using realistic methods for the generation and velocity measurement of Ps. |
| title | Development of an optimal laser for chirp cooling of positronium based on chirped pulse-train generator |
| topic | Optics High Energy Physics - Experiment Atomic Physics |
| url | https://arxiv.org/abs/2308.00877 |