Doppler-free two-photon absorption spectrum of cesium

Doppler-free two-photon spectroscopy has been used to investigate the transitions n2S ← 62S (n = 9 to 54) and n2D3/2.5/2 ← 62S (n = 7 to 53), and saturated absorption for the quadrupole transitions 52D3/2.5/2 ← 62S. Wavelengths of these transitions have been measured to an accuracy of 1 part in 107, and term values, quantum defects, and fine structure splittings evaluated. Series formulae have been used with the term values to obtain the ionization limit 31406.6376 ± 0.0016 cm−1.

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Doppler-free two-photon absorption spectrum of potassium

Canadian Journal of Physics ◽

10.1139/p83-117 ◽

1983 ◽

Vol 61 (6) ◽

pp. 949-955 ◽

Cited By ~ 25

Author(s):

D. C. Thompson ◽

M. S. O'Sullivan ◽

B. P. Stoicheff ◽

Gen-Xing Xu

Keyword(s):

Absorption Spectrum ◽

Fine Structure ◽

Photon Absorption ◽

Isotope Shifts ◽

Two Photon Absorption ◽

Two Photon ◽

Quantum Defects ◽

Ionization Limit

Doppler-free two-photon spectroscopy has been used to investigate the transitions n2S ← 42S (n = 6 to 55) and n2D3/2.5/2 ← 42S (n = 5 to 50) of 39K. Wavelengths of these transitions have been measured to an accuracy of 1 part in 107, and term values, quantum defects, fine structure splittings, and isotope shifts have been evaluated. The value of the ionization limit determined from these measurements is 35 009.8232 ± 0.0010 cm−1.

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Doppler-free two-photon absorption spectrum of rubidium

Canadian Journal of Physics ◽

10.1139/p79-293 ◽

1979 ◽

Vol 57 (12) ◽

pp. 2143-2154 ◽

Cited By ~ 75

Author(s):

B. P. Stoicheff ◽

E. Weinberger

Keyword(s):

Absorption Spectrum ◽

Hyperfine Structure ◽

Photon Absorption ◽

Two Photon Absorption ◽

Two Photon ◽

Quantum Defects ◽

Ionization Limit

Doppler-free, two-photon spectroscopy has been used to investigate the transitions n2S ← 52S and n2D ← 52S of atomic rubidium, from n = 9 to 116 and n = 7 to 124, respectively, only 7.3 cm−1 from the ionization limit. Wavelengths of these transitions have been measured to an accuracy of 1 part in 107, and series formulae computed for term values and quantum defects. Hyperfine structure splittings in the 92S to 132S levels have also been measured.

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Nonlinear Absorption and Ultrafast Dynamics of Ag Nanoparticle

Photonics ◽

10.3390/photonics8070233 ◽

2021 ◽

Vol 8 (7) ◽

pp. 233

Author(s):

Jijuan Jiang ◽

Jun Wang ◽

Tong Wu ◽

Yachen Gao

Keyword(s):

Silver Nanoparticles ◽

Time Constant ◽

Laser Intensity ◽

Photon Absorption ◽

Saturable Absorption ◽

Phonon Coupling ◽

Saturated Absorption ◽

Coupling Process ◽

Two Photon Absorption ◽

Two Photon

Resonant nonlinear optical absorption of silver nanoparticles was studied experimentally via open aperture Z-scan using 130 fs, 400 nm laser pulses. Experimental results show that, at low laser intensity, silver nanoparticles can exhibit saturated absorption. While at high laser intensity, it shows reverse saturated absorption. The saturable absorption is explained in terms of ground state plasmon bleaching, while the reverse saturable absorption is believed to be from two-photon absorption. Saturable optical intensity and two-photon absorption coefficient were obtained to be 1.3×1010 W/m2 and 3.3×10−10 m/W, respectively. The energy relaxation process of Ag nanoparticles after laser excitation was studied via pump-probe technique at 400 nm. Experimental results demonstrated that energy relaxation included electron-phonon coupling process with time constant τ1=(713±50) fs, and phonon-phonon coupling process with time constant τ2=(25.2±3) ps, respectively.

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