Determination of the stimulated emission cross section of neodymium glasses by measurement of the absorption from the thermally populated4I11/2levels

Ageeva, L.E.; Brachovskaya, N B; Lunter, S. G.; Przhevuskii, A. K.; Tolstoi, M. N.

doi:10.1070/qe1977v007n11abeh004130

Cited by 9 publications

(4 citation statements)

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“…Moreover, there is significant variation in the cross section values reported in the literature (2.0-4.8 x 10 -20 cm 2 for phosphate glass). [7][8][9][10][13][14][15]21,22]. Consequently, simulation of the energy extraction for multitransition, inhomogeneously broadened lines is difficult and uncertain because the positions, widths, strengths, and correlations of the individual transitions are not accurately known.…”

Section: Gain Saturation Studies In Lg-750 Andmentioning

confidence: 99%

Gain saturation studies in LG-750 and LG-770 amplifier glass

M¹,

Milam²,

Eimerl³

1997

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Experiments were performed on the 100-J class Optical Sciences Laser (OSL) at LLNL to characterize the saturation fluence and small-signal gain of a solid-state Nd:glass amplifier utilizing LG-750 and LG-770, an amplifier glass developed for the National Ignition Facility (NIF). These high quality measurements of gain saturation at NIF level fluences, i.e., 10-15 J/cm 2 , provide essential parameters for the amplifier performance codes used to design NIF and future high power laser systems. The small-signal gain, saturation fluence and square-pulse distortion were measured as a function of input fluence and pulse length in platinum-free LG-750 and LG-770. The input fluence, output fluence, small-signal gain and passive losses were measured to allow calculation of the saturation fluence. Least squares fits of the output vs. input fluence data using a Frantz-Nodvik[1] model was used to obtain an average saturation fluence for each data set. Overall, gain saturation in LG-750 and LG-770 is comparable at long pulse lengths. For shorter pulse lengths, < 5 ns, LG-770 exhibits a stronger pulse length dependence than LG-750, possibly due to a longer terminal level lifetime. LG-770 also has a higher cross-section, which is reflected by its slightly higher extraction efficiency.

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Section: Gain Saturation Studies In Lg-750 Andmentioning

confidence: 99%

Gain saturation studies in LG-750 and LG-770 amplifier glass

M¹,

Milam²,

Eimerl³

1997

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“…Measurements of the absorption spectra of glasses, of their fluorescence spectra and of their fluorescence decay time provide the basic spectroscopic information needed to assess the important laser-related characteristics, absorption of pump radiation, stimulated emission cross section and energy storage time. Many authors have discussed the analysis of these spectra (see, for example, the bibliography cited by Stokoswki et a1 (1978) and papers by Ageeva et al(1977), Dianov et a1 (1976) and Krupke (1974)).…”

Section: Spectroscopic Characteristics Of Neodymium Glasses and Crystalsmentioning

confidence: 99%

High-power lasers

Gibson

Key

1980

Rep. Prog. Phys.

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“…Ageeva et al . [3] calculated and experimentally determined the absorption coefficient of the dopant (Nd 3+ ions) for a number of phosphate and silicate glasses produced on an industrial scale and demonstrated that the absorption coefficient at the lasing wavelength due to the presence of neodymium depends linearly on the neodymium concentration. Therefore, the absorption coefficient a 1.053 of the KGSS 0180/35 glass in which the neodymium ion concentration is of the order of 3.5 × 10 20 cm -3 is close to 0.00017 cm -1 .…”

Section: Introductionmentioning

confidence: 99%

Effect of coloring impurities on the absorption in neodymium phosphate laser glass at a lasing wavelength

et al. 2006

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This paper reports on the results of the investigation of KGSS 0180/35 neodymium phosphate glasses produced on an industrial scale under oxidizing conditions and glasses prepared under experimental conditions in which iron and copper in small amounts rather than neodymium are introduced into the glass composition. The experimental glasses are synthesized by varying the redox conditions of melting. The oxidation states of transition metal impurities (Cu, Fe, V, Ni, Co) and the nonactive absorption coefficients of glasses at the lasing wavelength are determined. It is revealed that the main contribution to the nonactive absorption coefficient of the KGSS 0180/35 glass produced on an industrial scale is made by Cu 2+ ions at a concentration higher than 0.5 ppm. At a lower copper concentrations, the total contribution of Fe 2+ , V 4+ , Ni 2+ , and Co 2+ impurity ions to the nonactive absorption coefficient is comparable to that of Cu 2+ ions. It is demonstrated that a decrease in the concentration of coloring impurities in glasses and the optimization of redox conditions of melting make it possible to prepare phosphate laser glasses with a nonactive absorption coefficient of the order of 0.001 cm -1 . In terms of the nonactive absorption coefficient, these glasses are on a par with similar glasses of foreign manufacture and satisfy the requirements imposed on glasses by developers of high-power high-energy laser facilities.

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Determination of the stimulated emission cross section of neodymium glasses by measurement of the absorption from the thermally populated⁴I_11/2levels

Cited by 9 publications

References 1 publication

Gain saturation studies in LG-750 and LG-770 amplifier glass

Gain saturation studies in LG-750 and LG-770 amplifier glass

High-power lasers

Effect of coloring impurities on the absorption in neodymium phosphate laser glass at a lasing wavelength

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