Phase distortions in sum- and difference-frequency mixing in crystals

Smith, Arlee V.; Bowers, Mark S.

doi:10.1364/josab.12.000049

Cited by 63 publications

(32 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…͑i͒ A possible frequency shift arising in the doubling crystal as a result of the Kerr effect 20 and/or a phase-mismatch in the crystal. 17,21 The shift resulting from these two effects under our experimental conditions ͑pulse length of ϳ70 ns, crystal length of 5 mm, and peak intensity in the NIR of 2.4 ϫ 10 7 W / cm 2 ͒ is Ϫ1 kHz for the Kerr effect and less than Ϯ350 kHz for the frequency shift caused by phasemismatch, assuming the phase-mismatch ⌬k Ͻ 0.3 mm −1 , which corresponds to a 20% decrease in the conversion efficiency from its maximum value. ͑ii͒ The ac Stark shift induced by the 397 nm laser was determined by varying the laser pulse energies and extrapolating the transition frequencies.…”

Section: Fig 2 Field Ionization Spectra Of H 2 In the Region Of Tramentioning

confidence: 99%

Determination of the ionization and dissociation energies of the hydrogen molecule

Liu

Salumbides²,

Hollenstein³

et al. 2009

The Journal of Chemical Physics

185

193

View full text Add to dashboard Cite

The transition wave number from the EF 1 ⌺ g + ͑v =0,N =1͒ energy level of ortho-H 2 to the 54p1 1 ͑0͒ Rydberg state below the X + 2 ⌺ g + ͑v + =0,N + =1͒ ground state of ortho-H 2 + has been measured to be 25 209.997 56Ϯ ͑0.000 22͒ statistical Ϯ ͑0.000 07͒ systematic cm −1 . Combining this result with previous experimental and theoretical results for other energy level intervals, the ionization and dissociation energies of the hydrogen molecule have been determined to be 124 417.491 13͑37͒ and 36 118.069 62͑37͒ cm −1 , respectively, which represents a precision improvement over previous experimental and theoretical results by more than one order of magnitude. The new value of the ionization energy can be regarded as the most precise and accurate experimental result of this quantity, whereas the dissociation energy is a hybrid experimental-theoretical determination.

show abstract

Section: Fig 2 Field Ionization Spectra Of H 2 In the Region Of Tramentioning

confidence: 99%

Determination of the ionization and dissociation energies of the hydrogen molecule

Liu

Salumbides²,

Hollenstein³

et al. 2009

The Journal of Chemical Physics

185

193

View full text Add to dashboard Cite

show abstract

“…We minimized c t (dashed line) using an electro-optic modulator (EOM) to apply a frequency shift of opposite sign to the seed laser, which canceled the chirp induced in the dye cells [6,9,10]. Theoretical calculations [11] show that any further shift in exp caused by chirps induced in the BBO or LBO crystals is <1-2 MHz.…”

mentioning

confidence: 99%

Determination of the Antiproton-to-Electron Mass Ratio by Precision Laser Spectroscopy ofp¯He+

et al. 2006

View full text Add to dashboard Cite

A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of 9-16 10 ÿ9 . One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of M p =m e 1836:152 6745. DOI: 10.1103/PhysRevLett.96.243401 PACS numbers: 36.10.ÿk, 06.20.Dk, 14.20.Dh, 32.70.Jz We report here new measurements on the transition frequencies of antiprotonic helium atoms ( pHe e ÿ ÿ p ÿ 4 He 2 ) [1] using a femtosecond optical frequency comb [2,3] in conjunction with a continuous-wave (cw) pulse-amplified laser (Fig. 1). Their experimental precision is a factor 6 -20 better than our previous best ones [4], and now approaches those of, e.g., the 1 1 s-2 1 s [5] and 1 1 s-2 1 p [6] transitions in ordinary helium. From the frequencies of 12 transitions measured to the Doppler-broadened limit at a cryogenic temperature of 10 K, we have deduced the mass and charge of the antiproton relative to both the proton and the electron with a precision of the order of the known proton-to-electron mass ratio [7].Reference [4] describes how a radio-frequency quadrupole decelerator was used to slow down the antiprotons emerging from the CERN Antiproton Decelerator to 100-keV energies. They were then stopped in a helium target of low atomic density 10 18 cm ÿ3 to produce pHe atoms which filled a volume V 100 cm 3 . Antiprotons in pHe states with high principal (n 38) and angular momentum (') quantum numbers reach the helium nucleus over a period of several microseconds. The resulting delayed annihilation time spectra (DATS), i.e., the annihilation rate versus time elapsed since pHe formation, was measured by Cherenkov counters [ Fig. 2(a)]. In all but one of the present experiments, linearly polarized laser pulses of energy density " 0:04-1 mJ=cm 2 (e.g., applied here at t 1 s) stimulated transitions with dipole moments 0.02 -0.3 D from these pHe states, to states with nanosecond-scale lifetimes against Auger emission [1] and annihilation. The resulting peak in the DATS signaled the resonant frequency.Only pulsed lasers can provide the megawatt-scale intensities needed here to induce the pHe transitions. However, fluctuations in their frequency and linewidth and the difficulty of calibrating the wide range of pHe wavelengths 264:7-726:1 nm have so far limited our experimental precision [4]. We have now circumvented these problems by basing our experiments on a cw laser whose frequency cw could be stabilized with a precision <4 10 ÿ10 against an optical comb. Its intensity was then amplified [6,8,9] by a factor 10 6 to produce a pulsed laser beam of frequency pl cw with an accuracy and resolution 1-2 orders of magnitude higher than before [4].This was done as follows: First, a Nd:YVO 4 laser (Coherent Verdi, B in Fig. 1

show abstract

“…Furthermore, because the wave-front direction of the generated pulse is determined primarily by the seed beam, an injection-seeded pulsed coherent source has minimal sensitivity to any apparent phase shift that may result from tilt variations between the cw reference and pulsed beams. 15 In the simplest case, the cw and pulsed radiation fields (with electric vectors E cw and E p , respectively) are assumed to be linearly polarized plane waves 2 :…”

mentioning

confidence: 99%

Control of frequency chirp in nanosecond-pulsed laser spectroscopy 1 Optical-heterodyne chirp analysis techniques

White

Orr

et al. 2004

J. Opt. Soc. Am. B

View full text Add to dashboard Cite

Phase distortions in sum- and difference-frequency mixing in crystals

Cited by 63 publications

References 13 publications

Determination of the ionization and dissociation energies of the hydrogen molecule

Determination of the ionization and dissociation energies of the hydrogen molecule

Determination of the Antiproton-to-Electron Mass Ratio by Precision Laser Spectroscopy ofp¯He+

Control of frequency chirp in nanosecond-pulsed laser spectroscopy 1 Optical-heterodyne chirp analysis techniques

Contact Info

Product

Resources

About