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

Zhai, Yueyang; Fan, Bo; Yang, Su; Zhang, Yin; Qi, Xianghui; Zhou, Xiaoji; Chen, Xuzong

doi:10.1088/0256-307x/30/4/044209

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…However, as the SHG wavelength is approaching the limit of the transparency window of KTP (350 nm), the linear absorption becomes an important issue. Earlier reports [19][20][21] have shown considerable absorption in the violet wavelength with KTP, leading to large thermal effects. Based on this, we deliberately avoid optimal focusing to circumvent these thermal effects.…”

Section: Shg Setupmentioning

confidence: 97%

“…Although many papers [8,9,19,20] mentioned the generation of 397.5 nm violet lasers by external-cavity SHG with PPKTP crystals, none of them presented a detailed study. In 2013, Zhai et al [21] solely discussed the frequency doubling to 397 nm with PPKTP crystals in a ring cavity. However, they employed a tight focusing of the waist size to 25 μm in a 30 mm PPKTP crystal, resulting in severe thermal effects and low SHG power output (40 mW).…”

Section: Introductionmentioning

confidence: 99%

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Generation of 130 mW of 3975 nm tunable laser via ring-cavity-enhanced frequency doubling

Han

Bai

et al. 2014

J. Opt. Soc. Am. B

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We report on the frequency doubling of a tapered amplifier-boosted distributed-Bragg-reflector continuous-wave laser system at 795 nm, using a PPKTP crystal placed in an external ring cavity. A tunable 397.5 nm violet laser power of 130 mW with a mode-matched input 795 nm laser power of 416 mW is obtained (conversion efficiency η 31%), limited by thermally induced bistability. However, when the violet laser is at the maximum output, a stable operation more than 30 min is hard to reach due to thermal effects. With a scanning cavity, the peak violet laser power rises up to 180 mW, corresponding to an overall efficiency of η 43%. The generated 397.5 nm laser with good beam quality and satisfying power has huge potential use in quantum optics and cold-atom physics.

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Section: Shg Setupmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Generation of 130 mW of 3975 nm tunable laser via ring-cavity-enhanced frequency doubling

Han

Bai

et al. 2014

J. Opt. Soc. Am. B

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“…Experimental generations of the UV radiation by frequency doubling have been demonstrated in recent years. Periodically polled KTiOPO 4 (PPKTP) crystal is widely utilized [6][7][8][9]. Our group frequency doubled the 795 nm laser with PPKTP crystals in a bow-tie type four-mirror ring cavity [10] and a semi-monolithic cavity [11], the corresponding conversion efficiency is 31% and 41% respectively in the low power regime.…”

Section: Introductionmentioning

confidence: 99%

Comparison and characterization of efficient frequency doubling at 397.5 nm with PPKTP, LBO and BiBO crystals

Han

Wang

2016

Laser Phys.

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A continuous-wave Ti:sapphire laser at 795 nm is frequency doubled in a bow-tie type enhancement four-mirror ring cavity with LiB3O5 (LBO), BiB3O6 (BiBO), and periodically polled KTiOPO4 (PPKTP) crystals, respectively. The properties of 397.5 nm ultra-violet (UV) output power, beam quality, stability for these different nonlinear crystals are investigated and compared. For PPKTP crystal, the highest doubling efficiency of 58.1% is achieved from 191 mW of 795 nm mode-matched fundamental power to 111 mW of 397.5 nm UV output. For LBO crystal, with 1.34 W of mode-matched 795 nm power, 770 mW of 397.5 nm UV output is achieved, implying a doubling efficiency of 57.4%. For BiBO crystal, with 323 mW of mode-matched 795 nm power, 116 mW of 397.5 nm UV output is achieved, leading to a doubling efficiency of 35.9%. The generated UV radiation has potential applications in the fields of quantum physics.

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“…[53] The quasi-phase-matched (QPM) technique was first proposed by Bloembergen in 1962 and, currently, it has been developed into a more mature technique. [51][52][53][54][55][56][57] In the QPM technique, the phase difference between different wavelengths was compensated for by periodically modulating the nonlinear polarizabilities of nonlinear photonic crystals, [58][59][60][61][62][63] thus improving the conversion efficiency of nonlinear optical frequencies. [64][65][66][67] Inspired by this report, [53] we introduce a QPM technique for 1D dipole soliton transmission in 𝜒 (2) nonlinear photonic crystals, which realizes the stable transmission of a 1D dipole soliton in the second harmonic case.…”

mentioning

confidence: 99%

Three-Wave Mixing of Dipole Solitons in One-Dimensional Quasi-Phase-Matched Nonlinear Crystals

Guo 郭,

Xu 徐,

Chen 陈

et al. 2024

Chinese Phys. Lett.

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In this paper, a quasi-phase-matched (QPM) technique is introduced for soliton transmission in a quadratic (x (2)) nonlinear crystal to realize stable transmission of dipole solitons in one-dimensional (1D) space under three-wave mixing. We report four types of solitons as dipole solitons with distances between their bimodal peaks that can be laid out in different stripes. We study three cases of these solitons: spaced three stripes apart, one stripe apart, and confined to the same stripe. For the case of three stripes apart, all four types have stable results, but for the case of one stripe apart, stable solutions can only be found at w 1 = w 2, and for the condition of dipole solitons confined to one stripe, stable solutions exist only for Type1 and Type3 at w 1 = w 2. The stability of the soliton solution is solved and verified using the imaginary time propagation (ITP) method and real-time transfer propagation (RTP), and soliton solutions are shown to exist in the multistability case. In addition, the relations of the transportation characteristics of the dipole soliton and the modulation parameters are numerically investigated. Finally, possible approaches for experimental realization of the solitons are outlined.

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

Cited by 6 publications

References 12 publications

Generation of 130 mW of 3975 nm tunable laser via ring-cavity-enhanced frequency doubling

Generation of 130 mW of 3975 nm tunable laser via ring-cavity-enhanced frequency doubling

Comparison and characterization of efficient frequency doubling at 397.5 nm with PPKTP, LBO and BiBO crystals

Three-Wave Mixing of Dipole Solitons in One-Dimensional Quasi-Phase-Matched Nonlinear Crystals

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