Tailored pulse sequences from an 880 nm pumped Nd:YVO_4 bounce amplifier

Morgenweg, J.; Eikema, K.S.E.

doi:10.1364/ol.37.000208

Cited by 20 publications

(16 citation statements)

References 16 publications

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“…In the new system both the pump laser and the FC operate at the same repetition rate, so that selection of the appropriate pump laser pulses automatically amplifies FC pulses with the same delay. The pump laser system under development [13] consists of a Nd:YVO 4 modelocked laser (operating near 125 MHz) followed by a combination of a fast AOM and EOM. With these modulators, two pulses can be selected with a time delay that is a multiple of 8 ns.…”

Section: Resultsmentioning

confidence: 99%

Direct frequency metrology Up To PHz frequencies

Pinkert¹,

Morgenweg²,

Barmes³

et al. 2012

2012 European Frequency and Time Forum

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The capability of frequency-comb (FC) lasers to precisely measure optical frequencies has been extended to the to the extreme ultraviolet (XUV, wavelengths shorter than 100 nm), corresponding to frequencies of multiple PHz. We demonstrate "broad frequency comb generation" for a wavelength range of 51-85 nm. Our method is based on amplification and coherent up-conversion of a pair of pulses originating from a near-infrared femtosecond FC laser. Excitation of argon, neon, and helium with these upconverted laser pulses in the XUV lead to Ramsey-like signals with up to 61% contrast. From these signals an accuracy of 6 MHz has been achieved in the determination of the ground state ionization energy of helium at 51 nm. Further improvement to a kHz-level accuracy is expected based on a new pump laser for the employed parametric amplification system.

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Section: Resultsmentioning

confidence: 99%

Direct frequency metrology Up To PHz frequencies

Pinkert¹,

Morgenweg²,

Barmes³

et al. 2012

2012 European Frequency and Time Forum

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“…Further power scaling of the system will be possible by utilizing a tandem bounce amplifier geometry. Finally, further improvement of the optical efficiency in the system will be possible with 880 nm laser diode pumping [39]. …”

Section: Discussionmentioning

confidence: 99%

High average power, diffraction-limited picosecond output from a sapphire face-cooled Nd:YVO_4 slab amplifier

et al. 2015

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“…The pulse length is increased to 75 picoseconds by spectral clipping; two of them are then selected using fast modulators. Both pulses are then amplified to the 1-mJ level in a grazing-incidence side-pumped Nd:YVO 4 bounce amplifier (detailed in [32,33]). …”

Section: Laser Systemmentioning

confidence: 99%

High-accuracy deep-UV Ramsey-comb spectroscopy in krypton

Galtier¹,

Altmann²,

Dreissen³

et al. 2016

Appl. Phys. B

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and bound-state QED tests based on precision spectroscopy in atoms, molecules and highly charged ions (see, e.g., [5][6][7][8][9][10]). Moreover, in the pursuit of testing QED ever better, substantial efforts have been made to extract fundamental quantities such as the Rydberg constant R ∞ and the proton charge radius. Both can be obtained from spectroscopy of atomic hydrogen, assuming that QED is sufficiently precise. However, when the CREMA collaboration determined the proton charge radius from spectroscopy in muonic hydrogen (consisting of a proton and a muon), it leads to a considerable (7σ) mismatch with the value extracted from normal (electronic) hydrogen [11][12][13]. This mismatch, known as the proton radius puzzle, remains to be explained and requires more spectroscopic measurements, e.g., in systems other than (muonic) hydrogen. Recent results on muonic deuterium [14] reveal that also the deuteron radius is significantly smaller (7.5 σ) than the radius based on normal deuterium spectroscopy.Interesting candidates for precision spectroscopy to solve this puzzle need to be sufficiently simple for precise theoretical treatment. One example is molecular hydrogen, made possible by recent improvements in theory [15]. Another is He + [16], which can be compared to muonic-He + spectroscopy [13]. The experimental challenge is the short wavelengths required for excitation, which ranges from the deep UV (≈ 200 nm) for H 2 to extreme ultraviolet (XUV, < 60 nm) for He + .Such short wavelengths are typically obtained by frequency upconversion of near-infrared lasers in nonlinear crystals or noble gases. One can use a frequency-comb (FC) laser as the fundamental laser and take advantage of its excellent spectral resolution and pulse peak power, to perform direct frequency-comb spectroscopy (DFCS) [17][18][19]. To achieve sufficient upconversion to the UV or XUV range, several approaches have been investigated. AbstractIn this paper, we present a detailed account of the first precision Ramsey-comb spectroscopy in the deep UV. We excite krypton in an atomic beam using pairs of frequency-comb laser pulses that have been amplified to the millijoule level and upconverted through frequency doubling in BBO crystals. The resulting phase-coherent deep-UV pulses at 212.55 nm are used in the Ramseycomb method to excite the two-photon 4p 6 → 4p 5 5p[1/2] 0 transition. For the 84 Kr isotope, we find a transition frequency of 2829833101679(103) kHz. The fractional accuracy of 3.7 × 10 −11 is 34 times better than previous measurements, and also the isotope shifts are measured with improved accuracy. This demonstration shows the potential of Ramsey-comb excitation for precision spectroscopy at short wavelengths.

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Tailored pulse sequences from an 880 nm pumped Nd:YVO_4 bounce amplifier

Cited by 20 publications

References 16 publications

Direct frequency metrology Up To PHz frequencies

Direct frequency metrology Up To PHz frequencies

High average power, diffraction-limited picosecond output from a sapphire face-cooled Nd:YVO_4 slab amplifier

High-accuracy deep-UV Ramsey-comb spectroscopy in krypton

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