Optically detected nuclear resonance of excited and ground states of YPO4:Pr3+ (original) (raw)
Related papers
2001
Abstract Excited state absorption spectra from the 4f2 levels of Pr3+ in YPO4 to 4f5d were measured at 293 and 77 K using a pulsed pump–probe technique. The spectra from the 1D2 manifold were recorded by employing a continuous wave probe, whilst those from the 3PJ–1I6 states were recorded by using for the first time a pulsed probe. These experimental results are compared with the numerical predictions of a full calculation of the 4f5d levels and the agreement is found to be good.
Optical spectra and Zeeman effect for Pr3+ and Nd3+ in LuPO4 and YPO4
The Journal of Chemical Physics, 1982
tals have been measured from 4,000 to 30000 em , at liquid He and N 2 temperatures. 3+ 3+. Fluorescence was observed for Pr and Nd ~n YP0 4 , and Zeeman spectra were obtained in the visible region. The transitions were assigned and fit to a semi-empirical Hamiltonian with adjustable parameters via a least squares procedure. Satisfactory fits and reasonable agreement between calculated and measured g values were obtained.
Crystal field analysis of Tm3+ and Yb3+ in YPO4 and LuPO4
The Journal of Chemical Physics, 1984
The optical and near infrared absorption of dilute Tm 3 + and Yb 3 + impurities in YP0 4 and LuP0 4 single crystals have been measured at 1 iquid helium and nitrogen temperatures. For Tm 3 +, the spectral region from 5000 to 38,000 cm-1 was examined and Zeeman spectra were obtained in the visible region. The observed transitions were assigned and fit to a semiempirical Hamiltonian with adjustable parameters via a leastsquares procedure. Satisfactory fits and gooa agreement between the calculated and measured g values were obtained. For Yb 3 +, there are more parameters than experimental levels, so s, B6, B6, and B~ were adjusted, while Bg and B~ were fixed at the values found. for Tm 3 +. Energy levels and Zeeman splittings calculated with these parameters are in good agreement with the measured quantities.
Excited-state absorption inPr3+:Y3Al5O12
Physical Review B, 1994
The optical-absorption transitions originating from the lowest 4fSd excited state of Pr'+ in Y,A1,0,z have been studied. The experimental arrangement uses a 7-ns 266-nm light pulse to populate the lowest 4fSd state, and a spatially overlapped, time-sequenced pulse from a frequency-tunable dye laser to induce transitions from that excited state. The excited-state-absorption (ESA) spectrum covering the 900-300-nm probe wavelength range is characterized by two broad peaks centered at 700 and 350 nm on a slowly rising background. The peak ESA cross section at 355 nm is (1+0.1)X10 ' cm'. The position, shape, and strength of the spectrum suggest that the terminal states of the ESA transitions are the second 4f5d state of Pr3+ and the conduction band of the host lattice. The ESA measurements have been extended to transitions from the Po and 'Di excited states of the 4f configuration of Pr + as well. The ESA cross sections at a probe wavelength of 532 nm are (8+1)X 10 ' cm' and (5.7+0.6) X 10 cm for transitions from the Po and 'D& excited states, respectively. The terminal state of ESA transitions from these two levels is the lowest 4f5d state. The strong ESA completely inhibits the potential laser action based on emission from these states in this crystal. 10 '-10 ' cm. More recently, strong ESA at a probe wavelength of 224 nm has been reported in four Pr +doped fluoride crystals: CaF2, SrF2, LiYF4, and BaY2FS. ' In Pr +LiYF4, these authors measured an ESA cross section of 2.6+0.5X10 ' cm at 224 nm which corresponds to a local emission peak characterized by an emission cross section of 2.0+0.2X10 ' cm .
Homogeneous broadening and hyperfine structure of optical transitions inPr3+:Y2SiO5
Physical Review B, 1995
Contributions to the homogeneous linewidth of the H&(1)~'Dz(1) transition for the two crystallographic sites of Pr in Y2SiO, have been investigated using photon echoes. The effects of excitationintensity-dependent dephasing or instantaneous diffusion were systematically studied to allow accurate determination of the optical resonance widths. Homogeneous linewidths of 2.8 kHz (site 1) and 1 kHz (site 2) were measured with no applied magnetic field and with sufficiently low laser intensity to minimize the effects of instantaneous diffusion. Using the same excitation intensity, widths of 2.1 kHz (site 1) and 0.85 kHz (site 2) were obtained with an applied magnetic field of 77 G, demonstrating a significant contribution of Y nuclear-spin fluctuations to the zero-field homogeneous linewidth. Extrapolation to zero excitation intensity yielded optical resonance widths that were only slightly narrower than the measured values. Optically detected nuclear magnetic resonance measurements determined the hyperfine structure of the H& ground state for each site; the hyperfine levels of the lowest component of the 'D2 manifold for each site were determined using photon echo nuclear double resonance. The relatively large oscillator strength of 3 X 10 for a rare-earth ion, in conjunction with long dephasing times makes this material a useful candidate for demonstration of time-domain signal processing and optical data storage.
Resonant enhancement of two-photon transitions to the second excited 4f5d state in Pr3+:Y3Al5O12
Phys. Rev. B, 1993
The two-photon absorption cross section for transitions from the 'H4 ground-state manifold to the second excited state of the 4f5d configuration of Pr'+ in Y&A1,0,2 is observed to be enhanced by about two orders of magnitude when the excitation frequency happens to be resonant with the PJ (J =0, 1,2) and 'I6 intermediate states of the 4f configuration. The structure and line shape of the two-photon excitation spectrum spanning the 39600-46950 cm transition-energy range are entirely dominated by these resonantly enhanced transitions, while the contributions from nonresonant transitions appear as a slowly varying background beneath the strong resonance peaks. A two-photon absorption cross section as high as 4X 10 cm s is measured at the peak of the resonantly enhanced transition at 44246 cm which involves a level of the I'2 manifold as the intermediate state. The spectrally integrated cross section over that manifold is 3.3 X 10 cm .
Excited state dynamics of Pr[sup 3+] in YVO[sub 4] crystals
Journal of Applied Physics, 2004
The quenching mechanism of the emission from the 3 P 0 level of Pr 3+ doped into YVO 4 has been investigated by means of optical spectroscopy techniques. Continuous wave and time-resolved emission and excitation measurements have been carried out as a function of the temperature and of the dopant concentration in order to obtain information on the energy-transfer processes involved in the host sensitization of the red luminescence and in the depopulation of the emitting states. The experiments have also been extended to LaVO 4 :Pr 3+ and YPO 4 :Pr 3+ , i.e., two crystals for which the 3 P 0 emission is stronger than for YVO 4 :Pr 3+ , with the aim of studying the relationship between of the host properties and the optical behavior of the Pr 3+ ion.