Frequency-tunable 500-mW continuous-wave all-solid-state single-frequency source in the blue spectral region

Bode, M.; Freitag, I.; Tünnermann, Andreas; Welling, H.

doi:10.1364/ol.22.001220

Cited by 42 publications

(25 citation statements)

References 15 publications

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“…For genuine CW stable operation, an active electronic servo based on an FM-to-AM fringe modulation technique was preferred to the optically phasesensitive Hänsch-Couillaud method that was reported to fail when thermal effects arise [8,19].…”

Section: Resonant Enhancement Efficiencymentioning

confidence: 99%

“…• C) [8]. As an additional drawback, KNbO 3 is subject to blue-induced photo-chromic damage known as BLIIRA (Blue-Induced Infrared Absorption [10]).…”

Section: Introductionmentioning

confidence: 99%

“…As an additional drawback, KNbO 3 is subject to blue-induced photo-chromic damage known as BLIIRA (Blue-Induced Infrared Absorption [10]). This nonlinear loss mechanism, together with the associated thermal lensing, has limited the highest reported conversion efficiency to η ∼ 80%, yielding 500 mW of blue power at 473 nm from a Nd:YAG laser power P in ω ∼ 800 mW [8].…”

Section: Introductionmentioning

confidence: 99%

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75%-Efficiency blue generation from an intracavity PPKTP frequency doubler

Targat

Zondy

Lemonde

2005

Optics Communications

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We report on a high-efficiency 461 nm blue light conversion from an external cavityenhanced second-harmonic generation of a 922 nm diode laser with a quasi-phasematched KTP crystal (PPKTP). By choosing a long crystal (L C = 20 mm) and twice looser focusing (w 0 = 43 µm) than the "optimal" one, thermal lensing effects due to the blue power absorption are minimized while still maintaining near-optimal conversion efficiency. A stable blue power of 234 mW with a net conversion efficiency of η = 75% at an input mode-matched power of 310 mW is obtained. The intracavity measurements of the conversion efficiency and temperature tuning bandwidth yield an accurate value d 33 (461 nm) = 15 (±5%) pm/V for KTP and provide a stringent validation of some recently published linear and thermo-optic dispersion data of KTP.

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Section: Resonant Enhancement Efficiencymentioning

confidence: 99%

“…• C) [8]. As an additional drawback, KNbO 3 is subject to blue-induced photo-chromic damage known as BLIIRA (Blue-Induced Infrared Absorption [10]).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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75%-Efficiency blue generation from an intracavity PPKTP frequency doubler

Targat

Zondy

Lemonde

2005

Optics Communications

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“…PAS light is generated from an extended cavity diode laser at 922 nm using second-harmonic generation in a linear enhancement cavity [28]. The laser linewidth is 80 MHz FWHM in the blue on a millisecond time scale, which contributes significantly to the observed PAS resonance linewidths.…”

mentioning

confidence: 99%

Spectroscopic Determination of thes-Wave Scattering Lengths ofSr86andSr

et al. 2005

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We report the use of photoassociative spectroscopy to determine the ground-state s-wave scattering lengths for the main bosonic isotopes of strontium, 86 Sr and 88 Sr. Photoassociative transitions are driven with a laser red detuned by up to 1400 GHz from the 1 S 0 -1 P 1 atomic resonance at 461 nm. A minimum in the transition amplitude for 86 Sr at ÿ494 5 GHz allows us to determine the scattering lengths 610a 0 < a 86 < 2300a 0 for 86 Sr and a much smaller value of ÿ1a 0 < a 88 < 13a 0 for 88 Sr. DOI: 10.1103/PhysRevLett.95.223002 PACS numbers: 32.80.Pj Photoassociative spectroscopy (PAS) of ultracold gases, in which a laser field resonantly excites colliding atoms to rovibrational states of excited molecular potentials, is a powerful probe of atomic cold collisions [1]. Transition frequencies have been used to obtain dispersion coefficients of molecular potentials, which yield the most accurate value of the atomic excited-state lifetime [2 -5]. Transition amplitudes are related to the wave function for colliding ground-state atoms [6,7] and can be used to determine the ground-state s-wave scattering length [8][9][10][11][12][13].The s-wave scattering length is a crucial parameter for determining the efficiency of evaporative cooling and the stability of a Bose-Einstein condensate (BEC). It also sets the scale for collisional frequency shifts, which can limit the accuracy and stability of atomic frequency standards.The cold collision properties of alkaline-earth atoms such as strontium, calcium, and magnesium, and atoms with similar electronic structure, such as ytterbium, are currently the focus of intense study. These atoms possess narrow optical resonances that have great potential for optical frequency standards [14 -18]. Laser cooling on narrow transitions [19] is an efficient route to high phasespace density [20,21], and a BEC was recently produced with ytterbium [22]. Fundamental interest in alkaline-earth atoms is also high because their simple molecular potentials allow accurate tests of cold collision theory [23][24][25].PAS of calcium [12] and ytterbium [13] was recently used to determine s-wave scattering lengths of these atoms. This Letter reports the use of PAS to determine the groundstate s-wave scattering lengths for the main bosonic isotopes of strontium, 86 Sr and 88 Sr, which have relative abundances of 10% and 83%, respectively. We find a huge scattering length for 86 Sr of 610a 0 < a 86 < 2300a 0 . Appreciable uncertainty comes from the value of C 6 for the ground-state potential. In contrast, for 88 Sr we find ÿ1a 0 < a 88 < 13a 0 . Recently posted [5] PAS results for 88 Sr yielded an improved measurement of the 5s5p 1 P 1 atomic lifetime ( 5:263 0:004 ns), which we use in our analysis. Disagreement between our reported value of a 88 and results of Ref.[5] will be discussed below.For PAS of strontium, atoms are initially trapped in a magneto-optical trap (MOT) operating on the 461 nm 1 S 0 -1 P 1 transition, as described in Refs. [4,26]. We are able to produce pure samples of each iso...

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“…A commonly used approach in reaching the blue part of the spectrum is second harmonic generation of near-infrared solid-state lasers or diode lasers. The second harmonic generation can be performed internal to the laser resonator 1,2 or in external enhancement resonators 3,4 . Using common diode-pumped solid-state lasers it is only possible to reach blue wavelengths above 440 nm 5 although the use of Ti:Sapphire lasers extend the spectral coverage of solid-state lasers to shorter wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Generation of more than 300 mW diffraction-limited light at 405 nm by second-harmonic generation of a tapered diode laser with external cavity feedback

Jensen

Holm

Sumpf

et al. 2007

Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI

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, P. M. (2007). Generation of more than 300 mW diffraction-limited light at 405 nm by second-harmonic generation of a tapered diode laser with external cavity feedback. In P. E. Powers (Ed.), Proceedings of SPIE (Vol. 6455 ABSTRACTWe have constructed a blue laser source consisting of a single-frequency tapered diode laser with external cavity feedback that is frequency doubled by a quasi-phase matched KTP (PPKTP) in a bowtie ring cavity and extract more than 360 mW of power at 405 nm. The conversion efficiency from fundamental laser power to second harmonic power is 35 %, while it is 64 % from coupled fundamental power to extracted blue light. Thermal effects and gray tracking set an upper limit on the amount of generated blue light.

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Frequency-tunable 500-mW continuous-wave all-solid-state single-frequency source in the blue spectral region

Cited by 42 publications

References 15 publications

75%-Efficiency blue generation from an intracavity PPKTP frequency doubler

75%-Efficiency blue generation from an intracavity PPKTP frequency doubler

Spectroscopic Determination of thes-Wave Scattering Lengths ofSr86andSr

Generation of more than 300 mW diffraction-limited light at 405 nm by second-harmonic generation of a tapered diode laser with external cavity feedback

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