Abstract
The dynamics of photoinduced absorption and holographic-grating recording in photorefractive crystals of bismuth silicate is studied. It is shown that, with the use of nanosecond laser pulses and of the intensity on the order of 1 MW/cm2 or higher, the induced absorption due to population of the short-lived trapping levels, with characteristic relaxation times about several milliseconds or tens of milliseconds, is the case. Recording of dynamic holograms has been realized in these conditions in bismuth silicate crystals. Two mechanisms of holographic-grating recording, with the lifetimes differing by three orders of magnitude, are established. At relatively low intensities, about 1 MW/cm2 or lower, the medium response is determined by a photorefractive mechanism of nonlinearity, with relaxation times of several seconds. At the intensities exceeding 5 MW/cm2, one can observe a fast (ms relaxation times) component that may be associated with population of the short-lived traps. It is shown that the contribution of each mechanism is greatly dependent on the intensity of laser radiation and, for the intensities above 10–15 MW/cm2, the short-lived traps having millisecond lifetimes play the decisive role.
Highlights
Holograms in Bismuth Silicate CrystalsAbstract—The dynamics of photoinduced absorption and holographic-grating recording in photorefractive crystals of bismuth silicate is studied
One of the significant advantages of cubic photorefractive crystals from the sillenites family (Bi12SiO20, Bi12TiO20, Bi12GeO20) is the real-time formation of dynamic holograms
This paper presents the results obtained during a study of the processes of photoinduced absorption and of the short- or long-lived holographic grating formation in photorefractive crystals of bismuth silicate (BSO), characterized by a complex structure of the defect centers, in conditions of pulsed laser excitation
Summary
Abstract—The dynamics of photoinduced absorption and holographic-grating recording in photorefractive crystals of bismuth silicate is studied. With the use of nanosecond laser pulses and of the intensity on the order of 1 MW/cm or higher, the induced absorption due to population of the short-lived trapping levels, with characteristic relaxation times about several milliseconds or tens of milliseconds, is the case. Two mechanisms of holographic-grating recording, with the lifetimes differing by three orders of magnitude, are established. At the intensities exceeding 5 MW/cm, one can observe a fast (ms relaxation times) component that may be associated with population of the short-lived traps. It is shown that the contribution of each mechanism is greatly dependent on the intensity of laser radiation and, for the intensities above 10–15 MW/cm, the short-lived traps having millisecond lifetimes play the decisive role
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