Wide-band microsecond dye laser with two-stage excitation

Батище, С. А.; Mostovnikov, V. A.; Tarkovsky, V. V.

doi:10.1070/qe1995v025n07abeh000429

Quantum Electron.

1995

DOI: 10.1070/qe1995v025n07abeh000429

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Wide-band microsecond dye laser with two-stage excitation

С. А. Батище

V. A. Mostovnikov

V. V. Tarkovsky

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“…The lasing characteristics of the new coumarins that were obtained with pumping by radiation from the electrical discharge excimer laser were compared with the generation parameters for microsecond pumping in a coaxial lamp-cuvette and coherent pumping by microsecond pulses in the dye laser converter in order to determine the optimum excitation conditions [11]. Figure 2 shows a diagram of the dye laser converter.…”

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“…Diagram of dye laser with excimer XeCl-laser pumping: excimer electrical discharge XeCl-laser (1), cylindrical lens (2), dye laser end mirror (3), cuvette with dye solution (4), dye laser exit mirror (stack) (5), glass turning mirror (6), IMO-2N meter (7), STE-1 diffraction spectrograph (8). (1), coaxial lamp-cuvette (2), stack (dye laser with lamp pumping exit mirror) (3), focusing lens (4), laserconverter exit mirror (R = 60%) (5), cuvette with standard rhodamine 6G solution (6), turning mirror (7), laser-converter end mirror (8), S8-14 dual-beam storage oscillograph (9), FK-22 meter (10), IMO-2N meter (11), DFS-8 diffraction spectrograph (12), glass turning plates (13)(14)(15).…”

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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: 99%

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

Ануфрик

Tarkovsky

2010

J Appl Spectrosc

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Effect of pump-induced loss on the spectral dependence of Rhodamine 6G laser efficiency under microsecond coherent pumping

Tarkovsky¹,

Ануфрик²,

Kurstak³

2021

Quantum Electron.

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We examine the effect of the pump-induced loss in the gain medium of a Rhodamine 6G laser on the spectral dependence of the laser efficiency under microsecond coherent pumping. It is shown theoretically and experimentally that the pump-induced loss is mainly due to nonlinear refraction and thermo-optic inhomogeneities of the gain medium, which produce a negative thermal lens, whose defocusing effect reduces the laser efficiency. The induced absorption by excited-state singlet and triplet levels of dye molecules is shown to make no significant contribution to changes in laser efficiency. The pump-induced thermal loss at the peak absorption wavelength of Rhodamine 6G plays a more important role well above the threshold pump power density (γ ⩾ 5). We demonstrate that the maximum dye laser efficiency under microsecond coherent pumping can only be achieved at an optimal pump wavelength.

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Structure, Lasing Characteristics, and Photostability of New Heteroarylcoumarins

2021

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Wide-band microsecond dye laser with two-stage excitation

Cited by 3 publications

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

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

Effect of pump-induced loss on the spectral dependence of Rhodamine 6G laser efficiency under microsecond coherent pumping

Structure, Lasing Characteristics, and Photostability of New Heteroarylcoumarins

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