High-efficiency generation of a low-noise laser at 447 nm

Zuo, Xiaoqing; Yan, Zhihui; Jia, Xiaojun

doi:10.7567/1882-0786/aafed8

Cited by 6 publications

(3 citation statements)

References 38 publications

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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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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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“…Thermal lensing, induced by increasing the input power, changes the initial mode-matching efficiency; therefore, reducing the thermal effect is crucial for avoiding drastic changes in the modematching efficiency. Some general approaches were employed by using a looser focusing [23,24], a ring frequency-doubling cavity [25][26][27][28][29][30][31], and an optimized crystal position [32]. The optimal impedance-matching efficiency can be obtained by optimizing the input power.…”

Section: Introductionmentioning

confidence: 99%

Realizing high efficiency 532 nm laser by optimizing the mode- and impedance-matching

Yao¹,

Wang²,

Liang³

et al. 2020

Laser Phys. Lett.

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Increasing the conversion efficiency of second harmonic generation (SHG) is an area of interest in research. We report a high-efficiency 532 nm laser generation, with a conversion efficiency of 94.04 ± 0.115% from the pump depletion of 98.1% ± 0.1%, by accurately quantifying the round-trip loss and the transmissivity of the input mirror using our proposed scheme. The optimal conversion efficiency of the cavity-enhanced frequency doubling process is independent of the waist and is determined by the pump depletion, round-trip loss, and transmissivity of the input mirror. These results show that the cavity-enhanced frequency doubling process is not necessary to set the focusing parameter at the optimal single-pass conversion. These results provide a guide for future research on high-efficiency SHG.

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“…When the signal and noise are measured, the stable bias phase of the interferometer is locked at π + 2kπ (k is an integer) with the phase locking system based on the Pound-Drever-Hall technique and a PZT 3 mounted mirror. When the two OPAs are pumped by the vertically polarized 448 nm continuous-wave single frequency laser from a SHG cavity [49,55], the OPAs amplify the intensities of phase-sensing lights within the interferometer and squeeze the noises on their phase-quadratures, respectively. The BHD system consisting of a 50:50 beam splitter BS 3 , two photodiodes and a subtractor.…”

mentioning

confidence: 99%

Quantum interferometer combining squeezing and parametric amplification

Zuo,

Yan,

Feng

et al. 2020

Preprint

Self Cite

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High precision interferometers are the building blocks of precision metrology and the ultimate interferometric sensitivity is limited by the quantum noise. Here we propose and experimentally demonstrate a compact quantum interferometer involving two optical parametric amplifiers and the squeezed states generated within the interferometer are directly used for the phase-sensing quantum state. By both squeezing shot noise and amplifying phase-sensing intensity the sensitivity improvement of 4.86 ± 0.24 dB beyond the standard quantum limit is deterministically realized and a minimum detectable phase smaller than that of all present interferometers under the same phase-sensing intensity is achieved. This interferometric system has significantly potential applications in a variety of measurements for tiny variances of physical quantities.

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High-efficiency generation of a low-noise laser at 447 nm

Cited by 6 publications

References 38 publications

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

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

Realizing high efficiency 532 nm laser by optimizing the mode- and impedance-matching

Quantum interferometer combining squeezing and parametric amplification

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