Excited-state absorption spectroscopy of crystals doped with Cr3+, Ti3+, and Nd3+ ions. Review

Sevast'yanov, B. K.

doi:10.1134/1.1627442

Cited by 12 publications

(6 citation statements)

References 59 publications

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“…In the cases where a data fitting of band A became possible, it was observed that an increase of thermal annealing time leads to decrease of Cr 3+ in Al 1 sites and thus, an increase in the occupation of Al 2 sites. Besides, there is an increase of the Gaussian curves area, which [23]. As expected from the absorption coefficient data, the area under band B also increases until 2 h of annealing time, however band B vanishes for longer times, as already mentioned.…”

Section: Resultssupporting

confidence: 61%

Cr+3 Distribution in Al1 and Al2 Sites of Alexandrite (BeAl2O4: Cr3+) Induced by Annealing, Investigated by Optical Spectroscopy

Trindade¹,

Scalvi

Scalvi³

2010

EPE

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Abstract:In order to investigate optical properties of alexandrite, the present work deals with the influence of thermal annealing on optical absorption and luminescence spectra of natural samples. The exposure time to heat treatment at 1000 o C is taken into account. Possible migration of Cr 3+ ions from Al 1 (inversion site) to Al 2 (reflection site) is detected. Sample composition is obtained through Scanning Electron Microscopy (SEM) measurements and points to a rearrangement of Cr +3 and Fe 3+ ions in the alexandrite crystalline structure, under thermal annealing influence. This feature may be used to control the optical properties of natural alexandrite, which can be associated to the observed laser emission effect.

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Section: Resultssupporting

confidence: 61%

Cr+3 Distribution in Al1 and Al2 Sites of Alexandrite (BeAl2O4: Cr3+) Induced by Annealing, Investigated by Optical Spectroscopy

Trindade¹,

Scalvi

Scalvi³

2010

EPE

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“…It is worth noting that the average error on the determination of the FWHM of a resonance is slightly higher than 1 pm, which translates into sensitivities to optical losses changes of about 0.1 cm −1 . Therefore, we believe that this technique may also be of use for performing excited-state absorption (ESA) spectroscopy among excited levels, since the optical pumping powers required for achieving measurable excited-state populations would be very much reduced in comparison with those used in standard ESA spectroscopy on bulk materials [20,21]. Figure 5 represents the results obtained for the same sphere when collecting light from two different physical regions (two different specific normal vector angles of the optical trajectory).…”

Section: B μ-Pl Characterizationmentioning

confidence: 99%

Local characterization of rare-earth-doped single microspheres by combined microtransmission and microphotoluminescence techniques

et al. 2012

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We present the optical characterization of single light emitting glass microspheres by means of an experimental setup that combines μ-transmission and μ-photoluminescence measurements without the need of optical fibers for excitation or detection purposes. We demonstrate that the results provided by both techniques are consistent among them and can provide complementary information regarding the active material properties (material losses and cross sections) and the passive resonator ones (radiative quality factors, group refractive indices, sphere radius, and pump power threshold for mode spectral shifting). This work addresses Nd 3 doped borate glass microspheres, but the reported studies could be realized in other rare-earth-doped glass microspheres as well.

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“…Alexandrite (chromium-doped chrysoberyl, Cr 3+ :BeAl 2 O 4 ) laser crystals possess a broad emission band centered around 750 nm that enables tunable laser operation in the 700-860 nm wavelength range [1][2][3][4][5]. Moreover, it has extensive absorption bands in the visible region of the optical spectrum, which facilitate efficient pumping either by flahslamps or by red laser diodes.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

Demırbas¹,

Sennaroğlu²,

Kärtner³

2019

Opt. Mater. Express

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We present detailed measurements of effective emission cross section spectra of the Alexandrite gain medium in the 25-450°C temperature range and provide analytic formulas that can be used to match the measured spectra. The measurement results have been used to investigate the wavelength and temperature dependence of small signal gain, as well as gain bandwidth relevant for ultrafast pulse generation/amplification. We show that the estimated laser performance based on the measured spectroscopic data provides a good fit to the results in the literature. We further discuss the need for a detailed measurement of excited-state absorption cross section in future studies.

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Excited-state absorption spectroscopy of crystals doped with Cr3+, Ti3+, and Nd3+ ions. Review

Cited by 12 publications

References 59 publications

Cr+3 Distribution in Al1 and Al2 Sites of Alexandrite (BeAl2O4: Cr3+) Induced by Annealing, Investigated by Optical Spectroscopy

Cr+3 Distribution in Al1 and Al2 Sites of Alexandrite (BeAl2O4: Cr3+) Induced by Annealing, Investigated by Optical Spectroscopy

Local characterization of rare-earth-doped single microspheres by combined microtransmission and microphotoluminescence techniques

Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 °C range

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