Observation of 99% pump depletion in single-pass second-harmonic generation in a periodically poled lithium niobate waveguide

Parameswaran, K.R.; Kurz, J.R.; Roussev, Rostislav V.; Fejer, M. M.

doi:10.1364/ol.27.000043

Cited by 119 publications

(80 citation statements)

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“…Simpler setups for efficient second harmonic generation can be realized with quasi-phase matched materials, i.e. periodically poled crystals [26] or waveguide structures [27]. While waveguide structures have higher conversion efficiencies, periodically poled crystals are less expensive and easier to handle in terms of temperature management and pump light coupling.…”

Section: Introductionmentioning

confidence: 99%

Two-color photoionization of calcium using SHG and LED light

et al. 2010

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We present a photoionization method to load single 40 Ca ions in a linear Paul trap from an atomic beam. Neutral Ca I atoms are resonantly excited from the ground state to the intermediate 4s4p 1 P 1 -level using coherent 423nm radiation produced by single-pass second harmonic generation in a periodically poled KTiOPO 4 crystal pumped with an 120mW extended cavity diode laser. Ionization is then attained with a high-power light emitting diode imaged to the trap center, using an appropriately designed optical system composed of standard achromatic doublet lenses. The setup simplifies previous implementations at similar efficiency, and it hardly requires any maintenance at all.

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Section: Introductionmentioning

confidence: 99%

Two-color photoionization of calcium using SHG and LED light

et al. 2010

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“…In past years a lot of progress in highefficiency frequency upconversion has been achieved. In [9], a pump depletion of 99% was reported for 50 ns pulses. In [10], a single-photon conversion efficiency of 96% was observed.…”

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confidence: 98%

High-efficiency frequency doubling of continuous-wave laser light

et al. 2011

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We report on the observation of high-efficiency frequency doubling of 1550 nm continuous-wave laser light in a nonlinear cavity containing a periodically poled potassium titanyl phosphate crystal (PPKTP). The fundamental field had a power of 1:10 W and was converted into 1:05 W at 775 nm, yielding a total external conversion efficiency of 95 AE 1%. The latter value is based on the measured depletion of the fundamental field being consistent with the absolute values derived from numerical simulations. According to our model, the conversion efficiency achieved was limited by the nonperfect mode matching into the nonlinear cavity and by the nonperfect impedance matching for the maximum input power available. Our result shows that cavity-assisted frequency conversion based on PPKTP is well suited for low-decoherence frequency conversion of quantum states of light. © 2011 Optical Society of America OCIS codes: 060.5565, 190.2620. In quantum information science, low-decoherence interfaces are required in order to map quantum information from one system to another. Light at near-infrared frequencies, i.e., around 1550 nm, is well suited to distribute information over standard telecommunication fiber networks with low optical loss [1,2]. For quantum storage devices atomic transitions at around 800 nm are actively researched, in the pulsed as well as in the continuouswave regime [3][4][5]. In order to link these frequency regimes, light at telecommunication wavelengths might be upconverted, e.g., by second harmonic generation (SHG) [6][7][8]. In past years a lot of progress in highefficiency frequency upconversion has been achieved. In [9], a pump depletion of 99% was reported for 50 ns pulses. In [10], a single-photon conversion efficiency of 96% was observed. Here, however, the efficiency of the quantum state transfer was lower than this value due to a 25% background (dark) count rate. For secondharmonic generation of continuous-wave (cw) light [11,12], the highest external conversion efficiency reported so far is 90% [13]. This value also reflects the efficiency of the quantum state transfer since loss due to imperfect matching between input mode and cavity mode of the frequency converter was included and background and dark noise of the detection scheme was negligible.In this Letter, we experimentally investigate the efficiency of cavity-assisted SHG of cw light at 1550 nm in PPKTP. This material is a promising candidate for reaching high quantum state transfer efficiencies, since the optical absorption of the material is low enough to observe up to 12:7 dB of quantum noise squeezing [14]. We are particularly interested in maximizing the external conversion efficiency, as given by the power ratio of the 775 nm cavity output beam and the 1550 nm input beam, i.e., our conversion efficiency value is not artificially increased by inferring to a situation with perfect mode matching into the cavity. In the case of intracavity frequency doubling inside a laser resonator, a value of nearly 100% was recently observed [15]...

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“…However, several problems, such as non-uniformity and nonlinear drive, among others have affected the achievement of highly efficient SHG in single-pass bulk interactions. SHG waveguide devices can circumvent these problems [1] . Tight confinement of the interacting waves in the transverse direction provided by a waveguide considerably increases the optical intensity in a small area.…”

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confidence: 99%

“…Thus, normalized efficiency in a waveguide can be increased significantly. Highly efficient SHG has been demonstrated in the periodically poled lithium niobate (PPLN) waveguide [1,2] . However, the high power SHG in the PPLN waveguide is limited by such effects as photorefractive damage and green-induced infrared absorption (GRIIRA).…”

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confidence: 99%

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Thermally induced dephasing of high power second harmonic generation in MgO:LiNbO3 waveguides

Li¹,

Xu²

2011

中国光学快报

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High power second harmonic generation (SHG) in MgO-doped LiNbO 3 waveguides is investigated using a three-dimensional (3D) coupled thermo-optical model. Simulations performed for a 1 111.6-nm fundamental laser show the influence of the absorptions and the thermally induced dephasing on the conversion efficiencies of the different waveguides. The onset of the thermally induced dephasing effect for each waveguide is also indicated. As a result of high light intensity in the waveguide, nonlinear absorptions are identified as the possible main factors in efficiency losses in specific cases.

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Observation of 99% pump depletion in single-pass second-harmonic generation in a periodically poled lithium niobate waveguide

Cited by 119 publications

References 10 publications

Two-color photoionization of calcium using SHG and LED light

Two-color photoionization of calcium using SHG and LED light

High-efficiency frequency doubling of continuous-wave laser light

Thermally induced dephasing of high power second harmonic generation in MgO:LiNbO3 waveguides

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