Photon echo in ruby doped only by⁵³Cr isotope ions

Abstract

The signals of photon echo (PE) are investigated firstly in a ruby crystal doped only by the 53Cr isotope ions in a concentration of 0.03 – 0,05 wt%. The optical experiments were performed in backward regime at the wavelength of 693.4 nm both with a low magnetic field (200 G) and without it. Since the 53Cr isotope ions have hyperfine structure of levels the special attention was paid to the study of the stimulated photon echo and primarily to the investigation of its decay kinetics. It is established that this decay has a form which is typical to the signals of long-lived PE. But in contrast to the long-lived PE the decay time in our case is less than the lifetime of the excited 2E(Ē) state. The signals of primary photon echo and stimulated photon echo at a low longitudinal magnetic field and their decay curves are investigated. We observed the beats of temporal shape of these signals with a period of several tens of nanoseconds. Theoretical analysis shows that they are due to the hyperfine interaction of valence electrons of 53Cr isotope ions with their own nuclei. The obtained decay curves allow us to estimate the phase relaxation time at the presence of a magnetic field. It proves to be equal to 98 ns. The spectrum of stimulated photon echo signal in the doped ruby exposed to a magnetic field is measured.

Femtosecond photon echo and four-wave mixing studies on GaAs/AlGaAs heterostructure at room temperature

“…The coherent excitation of a semiconductor structure leads to a nonlinear polarization, which later decays on a subpicosecond timescale because of phase-breaking scattering processes affecting photoexcited carriers and phonons. The way to study their interactions involve the transient coherent spectroscopy using ultrashort laser pulses [1][2][3][4][5]. While the optical dephasing and relaxation experiments can be used to investigate the fundamental static and dynamic properties of condensed matter, they also favor the progress in electronic components and pure optical computing devices [6,7].…”

Collision relaxation in 13CH3F with buffers

“…Investigation of relaxation processes is one of the most traditional applications for any optical transients and in particular coherent transient processes. In this respect a photon echo represents one of the most powerful techniques applied today both in condensed media [3,4] and in gases [1,5]. Technique of primary photon echo proved extremely useful for discovery of new coherent phenomenon -collision induced echo [6], its polarization properties [7], their dependence on experimental conditions in combination with "usual" photon echo [8,9].…”

Optical echo-spectroscopy of highly doped Tm:YAG

“…Photon echo has been widely used in optical coherent spectroscopy for investigation of various resonant media [1][2][3][4][5][6][7][8][9], among which rare-earth doped solids are of special interest [10]. In particular, Tm 3+ :Y 3 Al 5 O 12 crystal (Tm:YAG) is currently considered as one of the most promising materials suited for coherent transient-based all-optical signal processing [11][12][13][14].…”