Linear and nonlinear optical properties of cobalt-doped zinc aluminum glass ceramics

Denisov, I. A.; Volk, Yu.V.; Malyarevich, A. M.; Yumashev, K. V.; Дымшиц, О. С.; Жилин, А. А.; Kang, Ung Gu; Lee, Kyeong-Hee

doi:10.1063/1.1555699

Cited by 49 publications

(34 citation statements)

References 9 publications

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“…Thus, increasing the CoO content in the charge of MAS sitalls from 0.1 to 0.3 mass% (by three times) produces an almost four-fold decrease of time τ from ≈450 to 120 nsec [43]. Time τ for Co 2+ :ZAS sitalls decreases by ~1.5 times (from 900 to 650 nsec) if the CoO concentration is doubled (from 0.5 to 1.0 mass%) [44]. It is possible that this explains the large difference in τ that is reported for Co 2+ :ZAS sitalls by various researchers (Table 3).…”

Section: Crmentioning

confidence: 90%

“…The quantities σ a at λ = 1. 34 :ZAS [44]. It is noteworthy that the optical characteristics of sitalls with Co ions, like crystals with dopant ions, are dependent on the dopant concentration.…”

Section: Crmentioning

confidence: 98%

“…It was shown in 1987 that sitalls can be doped with Cr 3+ ions and that such material is interesting as a luminescing convertor of solar radiation [36,37]. Later, optical properties of sitalls with Cr 4+ [38,39], Ni 2+ [38,40,41], Co 2+ [32,34,[42][43][44][45][46] ions and then with rare-earth ions [47][48][49][50] began to be investigated. Sitalls based on silicate glasses with equimolar contents of Mg and Al oxides (MgO, Al 2 O 3 ) or Zn and Al oxides (ZnO, Al 2 O 3 ) were used as the SA.…”

Section: Crystalline and Glassy-crystalline Matrices For Tc Transitiomentioning

confidence: 99%

“…Gain modulation pulses of duration 50 nsec with energy 24 μJ were obtained with diode pumping of a 1. 44 [177]. The duration of single pulses with lamp pumping of the LM was ≈60 nsec with energy 2.5-7 mJ [177].…”

Section: Ndmentioning

confidence: 99%

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Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Malyarevich

Yumashev

2009

J Appl Spectrosc

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Published data on spectroscopic characteristics of saturable absorbers based on crystals doped with tetrahedrally coordinated transition-metal ions (Cr 2+ , Cr 4+ , Cr 5+ , V 3+ , Cr 2+ , Fe 2+ ) in addition to their use as passive Q-switches for solid-state lasers emitting in the visible and near-infrared regions are reviewed.Introduction. The use of saturable absorbers (SA) as passive Q-switches (PS) in solid-state lasers is an effective method for generating nanosecond and subnanosecond light pulses. This method differs favorably from active control of laser cavity gain by the lack of mechanical perturbations of the optical devices, additional sources of power supply, and external electrical control circuits. This simplifies the construction and operation of the laser and reduces its cost. Compact solid-state mini-lasers and ultra-small lasers (so-called microchip lasers) can be fabricated if PS are used.A SA is an optical material for which the transmission increases with increasing power density of the incident radiation. The SA should satisfy several requirements in order to be used as a PS. First of all this applies to SA characteristics at the laser operating wavelength such as absorption saturation energy density, coefficient of residual absorption in the fully bleached state, bleaching rise and fall time, and optical destruction threshold. The requirements for their absolute values depend on the spectroscopic properties of the lasing medium (LM) and the laser cavity parameters.In most instances with certain exceptions, SA based on tetrahedrally coordinated (TC) transition-metal ions of the iron group have bleaching relaxation times that are longer than the generation time of the laser pulses obtained using them. Such SA are usually called slowly relaxing. Relaxation processes leading to a restoration of their initial absorption can be ignored in analyzing their operation in a laser. In the simplest instance (if a four-level diagram is used for the spectroscopic model of the SA), the criterion for SA functioning as a PS is written [1-8]:

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Section: Crmentioning

confidence: 90%

Section: Crmentioning

confidence: 98%

Section: Crystalline and Glassy-crystalline Matrices For Tc Transitiomentioning

confidence: 99%

Section: Ndmentioning

confidence: 99%

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Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Malyarevich

Yumashev

2009

J Appl Spectrosc

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“…It has been established that during synthesis of aluminosilicate sitall, a microcrystalline spinel phase is formed in it where the Co 2+ ions are found in tetrahedral coordination. This provides it with the optical characteristics needed for laser applications [8][9][10]. In particular, in the 1.5 µm region, sitalls with Co 2+ ions have ground state absorption and excited state absorption (GSA and ESA) cross sec-…”

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confidence: 98%

Passive Q-switching of erbium glass laser by magnesium aluminosilicate sitall with cobalt ions

et al. 2007

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We have studied the radiation output parameters for an erbium glass laser, lasing at a wavelength of 1.54 µm, with passive Q-switching by means of a cobalt-containing magnesium aluminosilicate sitall compared with a saturable absorber based on a magnesium aluminum spinel crystal with cobalt ions. We have shown that the output characteristics of the laser emission when using sitall are not inferior to the analogous characteristics of a laser based on a spinel crystal, and are practically independent of the temperature of the saturable absorber in the range 0 o C-80 o C. The duration (energy) of the output pulses was 70 nsec (~4 mJ), the energy dispersion of the radiation pulse relative to the average value was no greater than 3%, the beam divergence was 2.8 mrad, the laser beam quality factor was M 2 = 1.2.Key words: Q-switching, erbium glass laser, Co 2+ ion, magnesium aluminum spinel, aluminosilicate sitall.Introduction. In recent years, considerable attention has been focused on designing laser radiation sources in the 1.5 µm region. Radiation with this wavelength falls within the transparency range of the atmosphere and is eyesafe, which means that the prospects are good for using these lasers in range finders, target acquisition systems, systems for remote probing of the atmosphere, data transmission and processing. This is why it is important to develop a stable and efficient source of laser radiation that lases in this spectral range.For the applications indicated above, we need nanosecond radiation pulses with high peak power. Such pulses can be obtained by operating the laser in passively Q-switched mode. Today the most efficient passive gate for erbium glass lasers, lasing at a wavelength of 1.54 µm, is a magnesium aluminum spinel containing divalent cobalt ions (Co 2+ :MgAl 2 O 4 ) [1][2][3][4]. In this material, the Co 2+ ions occupy positions with tetrahedral coordination and have a large ground state absorption (GSA) cross section (σ GSA ≈ (3-5)⋅10 -19 cm 2 ), a rather long bleaching relaxation time (τ = 300-400 nsec), and low excited state absorption (ESA) (σ ESA /σ GSA < 0.05) [1,4]. At the same time, it has been demonstrated [5][6][7] that materials in the form of transparent glassceramic (sitall) containing divalent cobalt ions can be used as passive gates for lasers in the spectral range 1.3-1.6 µm. It has been established that during synthesis of aluminosilicate sitall, a microcrystalline spinel phase is formed in it where the Co 2+ ions are found in tetrahedral coordination. This provides it with the optical characteristics needed for laser applications [8][9][10]. In particular, in the 1.5 µm region, sitalls with Co 2+ ions have ground state absorption and excited state absorption (GSA and ESA) cross sec-

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Thermally induced cation ordering in $$\hbox {ZnAl}_{2}\hbox {O}_{4}{:}\hbox {Mg}^{2+}$$, $$\hbox {Fe}^{3+}$$ for sensing thermal history through photoluminescence

et al. 2021

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Linear and nonlinear optical properties of cobalt-doped zinc aluminum glass ceramics

Cited by 49 publications

References 9 publications

Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Saturable absorbers based on tetrahedrally coordinated transition-metal ions in crystals (Review)

Passive Q-switching of erbium glass laser by magnesium aluminosilicate sitall with cobalt ions

Thermally induced cation ordering in $$\hbox {ZnAl}_{2}\hbox {O}_{4}{:}\hbox {Mg}^{2+}$$, $$\hbox {Fe}^{3+}$$ for sensing thermal history through photoluminescence

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