Ultrafast double pulse parametric amplification for precision Ramsey metrology

Kandula, D. Z.; Renault, A.; Gohle, Christoph; Wolf, A.; Witte, Stefan; Hogervorst, W.; Ubachs, Wim; Eikema, K.S.E.

doi:10.1007/978-3-540-95946-5_274

Cited by 3 publications

(7 citation statements)

References 19 publications

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“…In order to measure additional phase shifts induced by the OPCPA, the phases of the two amplified FC pulses were compared with the technique of linear spectral interferometry, using 25% of the FC seed power split off before the OPCPA as a reference [18,19]. By comparing the spectral interference patterns of the two FC pulses, the differential spectral phase induced by the OPCPA can then be determined via a Fourier-transform method [20].…”

Section: Post-amplifiermentioning

confidence: 99%

Multi-delay, phase coherent pulse pair generation for precision Ramsey-frequency comb spectroscopy

Morgenweg¹,

Eikema²

2013

Opt. Express

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Abstract:We demonstrate the generation of phase-stable mJ-pulse pairs at programmable inter-pulse delays up to hundreds of nanoseconds. A detailed investigation of potential sources for phase shifts during the parametric amplification of the selected pulses from a Ti:Sapphire frequency comb is presented, both numerically and experimentally. It is shown that within the statistical error of the phase measurement of 10 mrad, there is no dependence of the differential phase shift over the investigated inter-pulse delay range of more than 300 ns. In combination with nonlinear upconversion of the amplified pulses, the presented system will potentially enable short wavelength (<100 nm), multi-transition Ramsey-frequency comb spectroscopy at the kHz-level. high-harmonic generation inside a femtosecond enhancement cavity," Phys. Rev. Lett. 94, 193201 (2005).

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Section: Post-amplifiermentioning

confidence: 99%

Multi-delay, phase coherent pulse pair generation for precision Ramsey-frequency comb spectroscopy

Morgenweg¹,

Eikema²

2013

Opt. Express

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“…This still leads to rather narrowly spaced modes. A solution was demonstrated, making use of the amplification of only a few subsequent pulses from a comb laser to microjoules (Witte et al 2005, Zinkstok et al 2006) and even milli-joules level (Kandula et al 2008). With pulse lengths in the 100 fs-1 ps range, this is sufficient to generate HHG.…”

Section: Two-pulse Frequency Comb Amplification and Excitationmentioning

confidence: 99%

“…Geometrical and real phase shifts could be distinguished in this manner with an accuracy of 25 mrad (Witte et al 2005). An improved version at a level of 5 mrad was demonstrated by Kandula et al (2008) for characterizing the beam from an optical parametric amplifier. One should bear in mind though that the phase shifts can vary spatially across the beam on a level of 30-100 mrad for such an amplifier (Kandula et al 2008).…”

Section: Figure 40mentioning

confidence: 99%

“…An improved version at a level of 5 mrad was demonstrated by Kandula et al (2008) for characterizing the beam from an optical parametric amplifier. One should bear in mind though that the phase shifts can vary spatially across the beam on a level of 30-100 mrad for such an amplifier (Kandula et al 2008). However, it seems feasible to determine the average effective phase shift at a level of 10 mrad or better.…”

Section: Figure 40mentioning

confidence: 99%

“…One idea pursued in our lab is to excite the 1s 2 1 S 0 → 1s5p 1 P 1 transition at 51.6 nm of He with two phase-coherent XUV pulses about 10 ns apart, aiming for an accuracy of 15 MHz or better. The pulses will be generated by a combination of a doublepulse parametric amplifier (Kandula et al 2008) and 15th harmonic generation in krypton.…”

Section: Frequency Comb Excitation In the Vuvmentioning

confidence: 99%

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Precision Laser Spectroscopy in the Extreme Ultraviolet

Eikema

Ubachs

2011

Handbook of High‐resolution Spectroscopy

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Techniques for the production of short wavelengths in the extreme ultraviolet wavelength range are described, spanning low‐order harmonic generation in the perturbative regime for narrow bandwidth XUV production to the plateau‐regime with the three‐step collisional model for the generation of high harmonics with broadband ultrafast pulses. In addition, the intermediate regime is discussed for pulses of 300 ps duration, as well as the regime of harmonic conversion based on continuous wave lasers aiming at the production of coherent Lyman‐α radiation. Applications of XUV sources in the frequency domain typically rely on the production of XUV‐light from narrowband Fourier‐transform‐limited pulses for recording high‐resolution spectra. Alternatively, harmonically upconverted pulses of ultrashort duration (with inter‐pulse coherence) can be used for spectroscopic studies in the time and frequency domain (such as direct frequency comb spectroscopy techniques). Examples of both approaches for atomic and molecular spectroscopy are discussed at some length. For precision metrology on atomic systems, a focus is put on the Lamb shift determination in the He ground state. In the realm of molecular spectroscopy, predissociation phenomena in the nitrogen molecule are highlighted, with relevance for dissociation processes occurring in the upper layers of the Earth atmosphere. Similar predissociation phenomena in carbon monoxide are also treated in some detail, in this case with relevance for the chemistry in interstellar clouds. Precision XUV spectroscopy of molecular hydrogen is discussed as well, as it relates to the possibility of detecting a variation of the proton–electron mass ratio on a cosmological time scale. In the last section, applications of direct frequency comb spectroscopic techniques at short wavelengths are explained and prospects are given for using these techniques at extreme ultraviolet wavelengths.

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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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Ultrafast double pulse parametric amplification for precision Ramsey metrology

Cited by 3 publications

References 19 publications

Multi-delay, phase coherent pulse pair generation for precision Ramsey-frequency comb spectroscopy

Multi-delay, phase coherent pulse pair generation for precision Ramsey-frequency comb spectroscopy

Precision Laser Spectroscopy in the Extreme Ultraviolet

Direct frequency metrology Up To PHz frequencies

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