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

Targat, Rodolphe Le; Zondy, J.‐J.; Lemonde, P.

doi:10.1016/j.optcom.2004.11.081

Cited by 93 publications

(98 citation statements)

References 35 publications

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“…Several authors have reported on self-locking in different materials [1,2,10]. This effect can be seen when scanning the resonator, as asymmetrical peaks depending on the scan direction of the piezo.…”

Section: 2self-lockingmentioning

confidence: 95%

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Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

et al. 2009

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We present a measurements series of the efficiency of periodically poled KTP used for second harmonic generation in an external phase locked cavity. Due to the high absorption (0.01cm -1 ) in the PPKTP crystal at the pump wavelength a strong thermal dephasing of the periodically poled grating is observed for high pump powers. For four different resonator setups, it was experimentally found that a threshold parameter could be defined as the ratio between the focal intensity in the crystal and the single pass conversion efficiency. The value of this threshold for the onset of strong thermal dephasing was found to be 1.41·10 10 W 2 m -2 in our 30 mm long PPKTP sample. This threshold parameter marks the onset of thermally induced instability that leads to a degradation of the SHG conversion efficiency. Above the threshold the shape of the resonance peaks of the resonator changed from symmetrical into triangular making phase locking difficult.

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Section: 2self-lockingmentioning

confidence: 95%

“…The latter was determined in our crystal by both a direct transmission experiment and from finesse measurements of the external resonator. Several authors [1][2][3][4] have reported on thermal issues with high input powers in periodically poled crystals, due to absorption, but to our knowledge not for wavelengths lower than 423 nm.…”

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confidence: 91%

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

et al. 2009

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“…b System conversion efficiency (ratio of total input and output powers) as a function of input power. The efficiency saturates at ∼50 % [22,25]. Although more SFG input power is available, we choose to remain below 4 W input power to prevent (UVinduced) damage to the cavity optics at these powers [26].…”

Section: Second Harmonic Generationmentioning

confidence: 99%

A simple 2 W continuous-wave laser system for trapping ultracold metastable helium atoms at the 319.8 nm magic wavelength

2016

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extracted. This method was employed to determine charge radii of the halo nuclei 6 He and 8 He [8] but also to measure the 4 He − 3 He differential nuclear charge radius [9,10]. These measurements are relevant to current investigations into the so-called proton radius puzzle which arose when a similar measurement of the proton radius in µH found a 7σ discrepancy with the 2010 CODATA value [11]. Current efforts investigating the nuclear charge radii of µ 3 He + and µ 4 He + are projected to reach an experimental uncertainty at the sub-attometer (am) level [12]. Determinations of the 4 He − 3 He differential nuclear charge radius with comparable accuracy in electronic systems provide a valuable cross-check for these measurements.Currently, the two most accurate measurements of the 4 He − 3 He differential nuclear charge radius have achieved accuracies of 3 [9] and 11 am 2 [10], roughly an order of magnitude less precise than the projection of the µHe experiment, but disagree by 4σ. The former experiment resolved the 2 3 S → 2 3 P transition to within one thousandth of the 1.6-MHz natural linewidth and is not expected to be improved upon in the near future. The latter experiment was performed on the doubly forbidden 2 3 S → 2 1 S transition whose 8 Hz natural linewidth is not a limiting factor but has a very low excitation rate and thus requires a long interaction time. To achieve this He * atoms were cooled to quantum degeneracy (a BoseEinstein condensate (BEC) of 4 He * , and in a degenerate Fermi gas of 3 He * ) and trapped in an optical dipole trap (ODT). The accuracy of this experiment was limited by experimental effects, mainly the ac-Stark shift induced by the ODT.This problem is also encountered in optical lattice clocks where it is solved by employing so-called magic wavelength traps [13]. In a magic wavelength trap, the wavelength of the trapping laser is chosen such that AbstractHigh-precision spectroscopy on the 2 3 S → 2 1 S transition is possible in ultracold optically trapped helium, but the accuracy is limited by the ac-Stark shift induced by the optical dipole trap. To overcome this problem, we have built a trapping laser system at the predicted magic wavelength of 319.8 nm. Our system is based on frequency conversion using commercially available components and produces over 2 W of power at this wavelength. With this system, we show trapping of ultracold atoms, both thermal (~0.2 μk) and in a Bose-Einstein condensate, with a trap lifetime of several seconds, mainly limited by off-resonant scattering .

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“…Defocusing decreases the heating of the illuminated part of the crystal and consequentially decreases the thermal e ects in the cavity too. This approach was presented and experimentally con rmed in [42].…”

Section: Optimal Focusing In the Crystal And Thermal Lensingmentioning

confidence: 99%

“…Since the PP-KTP transparency range has an edge close to 400 nm depending on the sample, for the wavelength of 397 nm absorption can be considerably larger than for 423 nm. Applying the same treatment of the thermal lensing as presented in [42] we calculated the strength of the thermal lensing assuming the input power of the pump beam to be 100 mW. The temperature change induced by the pump beam to the central of the crystal is according to [42] equal to If we normalize the re ected power when the cavity is on the resonance P a to the power re ected when the light is not resonant to the cavity P b , we can calculate the intracavity losses from the following equation:…”

Section: Optimal Focusing In the Crystal And Thermal Lensingmentioning

confidence: 99%

Rubidium resonant squeezed light from a diode-pumped optical-parametric oscillator

et al. 2008

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

Cited by 93 publications

References 35 publications

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

Threshold for strong thermal dephasing in periodically poled KTP in external cavity frequency doubling

A simple 2 W continuous-wave laser system for trapping ultracold metastable helium atoms at the 319.8 nm magic wavelength

Rubidium resonant squeezed light from a diode-pumped optical-parametric oscillator

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