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Tarkovskii, V. V.; Kurstak, V.Yu.; Ануфрик, С. С.

doi:10.1023/a:1022410420296

Journal of Applied Spectroscopy

2002

DOI: 10.1023/a:1022410420296

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V. V. Tarkovskii

V.Yu. Kurstak

С. С. Ануфрик

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“…These compounds were selected for purely technical reasons related to the fact that the position of the absorption bands in them is most favorably located within the existing set of pumping wavelengths for establishing the desired function. Figure 3 shows plots that confirm the previously obtained results from a study of the lasing efficiency of several known dyes as functions of the spectral composition of the pumping radiation upon excitation by microsecond pulses [17,18]. Excitation was carried out within the limits of the principal absorption band.…”

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3-(2-Benzimidazolyl)coumarin derivatives —highly effective laser media

Ануфрик

Tarkovsky

2010

J Appl Spectrosc

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New laser dyes based on derivatives of 3-(2-benzimidazolyl)coumarin are proposed that lase under lamp and coherent (nanosecond and microsecond) pumping in the spectral range 420-700 nm and feature a high generation efficiency reaching 40% under coherent pumping (1% when lamp-pumped) and an increased operational life that surpasses that for most popular laser dyes. The nature of the substituents in the 6-and 7-positions of the coumarin ring and the ionic structure of the dyes are found to influence their spectral and lasing characteristics. Introduction.Organic dyes and related compounds that lase upon pumping by nanosecond laser pulses are currently very common. However, the number of lasing dyes is much smaller for non-monochromatic pumping by lamp pulses. This is due to photophysical and photochemical processes occurring in the cavity under the influence of the pumping radiation. Furthermore, the spectral range in which lasing occurs is overlapped unevenly by effectively lasing and photostable dyes [1]. For this reason, the search for new effectively lasing dyes with increased photochemical stability is a critical problem.The use of coumarin derivatives as lasing media in dye lasers is very interesting [2]. This is due to the fact that this class of compounds has the best energy characteristics and photostability in the blue-green spectral region [3]. The clearly pronounced polarization of their molecular structure enables the range of laser spectral tuning to be expanded using solvation effects [4][5][6][7].New compounds of this class, derivatives of 3-(2-benzimidazolyl)coumarin, were previously reported [8]. They were investigated with powerful non-coherent pumping. As a result, the studies found that the new coumarin dyes lasing upon lamp pumping in the spectral range 503-580 nm had high lasing efficiency (up to 1%) and photochemical stability (3-5 times greater than rhodamine 6G). However, the spectral-luminescent characteristics of the new compounds and the lasing parameters under coherent pumping conditions were not studied.Herein the spectral-luminescent characteristics and lasing parameters of 3-(2-benzimidazolyl)coumarin derivatives are studied under coherent pumping by radiation from an excimer XeCl-laser.Experimental Setup and Measurement Method. Figure 1 shows a diagram of the setup on which the lasing parameters of EtOH solutions of the coumarin dyes were studied. The pumping source was an electrical-discharge excimer XeCl-laser with emission energy 180-200 mJ and wavelength 308 nm. The excitation pulse duration was 60 ns. Radiation from the XeCl-laser was focused by a cylindrical lens (f = 10 cm) onto a cuvette with the dye. The dye laser cavity with base L = 15 cm was formed by a mirror (reflection coefficient R = 100%) and stack (R = 20%). The dye laser pulse energy and pumping control energy were measured using IMO-2N meters. The broad-band laser spectrum was recorded using an STE ′ -1 spectrograph. The dye laser emission was directed into the spectrograph using an optical fiber with inner dia...

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confidence: 81%

3-(2-Benzimidazolyl)coumarin derivatives —highly effective laser media

Ануфрик

Tarkovsky

2010

J Appl Spectrosc

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“…3b). It was shown earlier [20] that the same characteristic behavior is observed for an ethanol solution of rhodamine 6G. The shift in the lasing spectra toward shorter wavelengths suggests an increase in harmful losses [23].…”

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confidence: 59%

“…For the studied form of excitation, the optimal concentration is 1.25-2.5 millimoles/L. The dependences obtained for the lasing efficiency of NPG-P with incorporated dyes vs. the spectral composition of the pump are like those for ethanol solutions of different classes of dyes described in [20,21]. They have pump radiation conversion efficiencies at the same level.…”

mentioning

confidence: 71%

“…As the pump wavelength varies, the lasing band expands 10-12 nm toward shorter wavelengths, and in the "dip" region generally two-band lasing is observed. The anomalous behavior of the lasing efficiency of dye solutions when excited by microsecond laser pulses is explained by re-absorption of the pump radiation in the system of excited singlet levels, which leads to formation of reversible photoproducts having strong absorption in a certain spectral gain region [20,21].…”

mentioning

confidence: 99%

“…First of all, they ideally fall within the contour of the main absorption line of DCM; secondly, the wavelength 408 corresponds to the maximum of the lasing efficiency for DCM, while 500 nm falls precisely within the "dip" region on the spectral dependence of the efficiency. Since the observed anomalous dependences of the lasing efficiency on the pump wavelength are typical of different classes of dyes [21], the choice of dye for the picosecond experiments is purely arbitrary.…”

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Lasing efficiency of dyes incorporated into a nanoporous glass-polymer composite

et al. 2008

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We have used microsecond coherent pumping to study the lasing efficiency of active elements based on a nanoporous glass-polymer composite activated by organic dyes, as a function of the spectral composition of the pump within the main absorption band of the dye. We have shown that under the indicated excitation conditions, the lasing efficiency can exceed 40% and can be comparable with the lasing of liquid elements.Introduction. One disadvantage of lasers based on dye solutions is some inconvenience in operation associated with the fact that the active medium for this type of laser is a liquid. At the end of the 1960s, it was attempted to overcome this disadvantage using solid-state elements based on poly(methyl methacrylate) [1]. A disadvantage of these elements is their very low radiation resistance. Progress in this area began to be made in the 1980s after creation of solid-state matrices with high radiation resistance [2][3][4], and to date significant advances have been made in the field of solid-state dye lasers [5][6][7][8][9][10][11][12][13][14][15]. This is connected first of all with synthesis of new dyes and secondly with improvement of methods for introducing the dye into solid-state matrices [6]. Many authors use various approaches to composite solid-state systems. In [7], the lasing efficiency was determined as a function of the intensity of excitation and the laser photostability of gel systems with dyes. It was shown that the efficiency of conversion of the pump radiation and laser photostability of the dyes in composite gel systems is higher than in simple gel matrices. In [8], the lasing properties of rhodamine 6G (the chloride and the perchlorate) were studied in synthesized hybrid polymers based on an organic polymer (methyl methacrylate with hydroxyethyl methacrylate) and an inorganic precursor (tetraethoxysilane). It was shown that active media based on hybrid polymers have significantly higher operating life compared with active media based on organic polymers, which is associated with formation of an inorganic nanostructural network in them and consequently with an improvement in the thermooptical properties of the material and weakening of the thermally initiated process of decomposition of the active molecules. In [9], a technology was developed for obtaining active polymeric optical fibers doped with organic dyes. It was shown that the lasing efficiency of rhodamine 11B in a polymeric optical fiber with cw pumping may be as high as 36%. In [10][11][12], the spectral luminescence and lasing characteristics were studied for solid-state active media based on laser dyes of different classes (coumarins, rhodamines, paraterphenyl) emitting in the visible and UV regions and incorporated into silicate bulk matrices, gel matrices, and thin films. It was concluded that use of such elements was promising in fast conducting devices and in design of microlasers.In [13][14][15][16], new active elements are proposed that are based on a dye-activated nanoporous glass-polymer composite (NPG-P). In [13,1...

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Cited by 2 publications

References 1 publication

3-(2-Benzimidazolyl)coumarin derivatives —highly effective laser media

3-(2-Benzimidazolyl)coumarin derivatives —highly effective laser media

Lasing efficiency of dyes incorporated into a nanoporous glass-polymer composite

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