Three Methods to Lock the Second Harmonic Generation for 461 nm

Yu, 彭瑜 Peng; Yang, 赵阳 Zhao; Ye, 李烨 Li; Jianping, 曹建平 Cao; Zhanjun, 方占军 Fang; Erjun, 臧二军 Zang

doi:10.3788/cjl20103702.0345

Cited by 4 publications

(2 citation statements)

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“…However, due to its low power, a single laser setup is inadequate for fulfilling the demand of trapping and detecting strontium atoms. Therefore, a strontium atomic blue magneto-optical trap optical system requires an external cavity diode 461 nm seed laser to injection lock multiple slave lasers [17][18][19]. Although this scheme is widely used, the structure is complicated and the maintenance process is tedious.…”

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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show abstract

“…We were able to lock the cavity with a stable output power for 4 h, using internal modulation or Hansch-Couillaud locking. [5,12] In Fig. 3(b), the fringe asymmetry is observed on the cavity mode when scanning the PZT of the enhancement cavity.…”

mentioning

confidence: 98%

A Tunable Blue Light Source with Narrow Linewidth for Cold Atom Experiments

Zhai¹,

Fan²,

Yang³

et al. 2013

Chinese Phys. Lett.

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We present a 397-nm frequency-doubling system with a quasi-phase-matched KTP crystal (PPKTP) which features tunable, narrow linewidth, high power, and excellent mechanical stability. Using 20-mm and 30-mm-long PPKTP crystals, we establish two experimental setups based on different external cavity parameters. By testing the beat signal of these two lasers, the linewidth for the system is measured to be less than 2.5 MHz. The maximum power of blue light can be achieved up to 40 mW. With these performance characteristics, the constructed blue laser system is useful for applications in cold atom physics and precision measurements.

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High-peak-power nanosecond pulse laser at 915 nm based on all-fiber structure

Zhang,

Hou,

et al. 2025

Optics & Laser Technology

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Three Methods to Lock the Second Harmonic Generation for 461 nm

Cited by 4 publications

References 0 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

A Tunable Blue Light Source with Narrow Linewidth for Cold Atom Experiments

High-peak-power nanosecond pulse laser at 915 nm based on all-fiber structure

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