Optimal fill factor for laser diode arrays applied to transversally pumped erbium laser

Bezyazychnaya, T. V.; Bogdanovich, M. V.; Grigor’ev, A. V.; Kabanov, V. V.; Lebiadok, Y. V.; Ryabtsev, A. N.; Ryabtsev, G. I.; Щемелев, М. А.; Mehta, S. K.

doi:10.1016/j.optcom.2011.12.099

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…Based on the data obtained during theoretical and experimental investigations [2][3][4][5][6][7] of the ytterbium-erbium glass AE and InGaAs/AlGaAs LDA properties the series of 1.54 μm eye-safe portable laser sources (see Fig.1) with the output energy for the range of (3 -12) mJ. They emit the light pulses with the duration of 20-25 ns or less (pulse repetition rate up to 5 Hz).…”

Section: Eye-safe Ld-pumped Erbium Glass Lasers and Opo Systemsmentioning

confidence: 99%

“…In our previous works [1][2][3] it was ascertained that amplified spontaneous emission fluxes arisen in the LDA active layers are the parasitic process which increases the LDA threshold current and decreases the LDA output radiation power. Because of this fact it is necessary to investigate the ASE characteristics and the ways to suppress ASE fluxes in LDA active layer.…”

Section: Peculiarities Of the Lda Output Directional Radiation Patternmentioning

confidence: 99%

“…We have undertaken several attempts directed to the realization of similar approaches for the LD-pumped ytterbiumerbium glass and Nd:YAG lasers [1][2][3][4][5][6]. For example, the critical relation between the near field fill factor of the laser diode arrays (LDAs) intended for pumping the Yb,Er-glass laser (the lasing wavelength of 1.54 μm) and the laser threshold pump power was reviled theoretically and experimentally [3].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the critical relation between the near field fill factor of the laser diode arrays (LDAs) intended for pumping the Yb,Er-glass laser (the lasing wavelength of 1.54 μm) and the laser threshold pump power was reviled theoretically and experimentally [3]. As a result, a condition for the optimal adoption of the InGaAs/AlGaAs laser diode array heterostructure parameters to the LDA-transversally pumped Yb,Er-glass laser has been proposed.…”

Section: Introductionmentioning

confidence: 99%

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Physical and fabrication peculiarities which provide the high output energy and beam quality for the diode pumped erbium glass and Nd:YAG lasers are considered. Developed design approach allow to make passively Q-switched erbium glass eye-safe portable laser sources with output energy 8 -12 mJ (output pulse duration is less than 25 ns, pulse repetition rate up to 5 Hz) and beam quality M 2 less than 1.3. To reach these values the erbium laser pump unit parameters were optimized also. Namely, for the powerful laser diode arrays the optimal near-field fill-factor, output mirror reflectivity and heterostructure properties were determined. Construction of advanced diode and solid-state lasers as well as the optical properties of the active element and the pump unit make possible the lasing within a rather wide temperature interval (e.g. from minus forty till plus sixty Celsius degree) without application of water-based chillers. The transversally pumped Nd:YAG laser output beam uniformity was investigated depending on the active element (AE) pump conditions. In particular, to enhance the pump uniformity within AE volume, a special layer which practically doesn't absorb the pump radiation but effectively scatters the pump and lasing beams, was used. Application of such layer results in amplified spontaneous emission suppression and improvement of the laser output beam uniformity. The carried out investigations allow us to fabricate the solid-state Nd:YAG lasers (1064 nm) with the output energy up to 420 mJ at the pulse repetition rate up to 30 Hz and the output energy up to 100 mJ at the pulse repetition rate of of 100 Hz. Also the laser sources with following characteristics: 35 mJ, 30 Hz (266 nm); 60 mJ, 30 Hz (355 nm); 100 mJ, 30 Hz (532 nm) were manufactured on the base of the developed Nd:YAG quantrons.

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