Anisotropy of nonlinear absorption in Co2+:MgAl2O4 crystal

Volk, Yu.V.; Malyarevich, A. M.; Yumashev, K. V.; Matrosov, V. N.; Matrosova, T. A.; Kupchenko, M. I.

doi:10.1007/s00340-007-2716-5

Cited by 26 publications

(11 citation statements)

References 6 publications

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“…Cobalt‐doped magnesium aluminate (Co:MgAl 2 O 4 ) is of great interest as a medium for Q‐switching solid‐state lasers operating in the near‐infrared region, for example, 1.32 and 1.44 μm Nd:YAG lasers, 1.32‐μm iodine lasers, and 1.54‐μm erbium glass lasers . In the majority of cases, Co:MgAl 2 O 4 used as a saturable absorber is produced as single crystals, for instance by the Verneuil method or Czochralski method . Glass‐ceramics with cobalt‐doped spinel nanocrystals embedded in the glass matrix were proposed as an alternative .…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Absorption of Submicrometer Grain‐Size Cobalt‐Doped Magnesium Aluminate Transparent Ceramics

et al. 2014

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Transparent cobalt‐doped magnesium aluminate spinel (Co:MgAl2O4) ceramics with a submicrometer grain size were prepared by spark plasma sintering. For the first time, the nonlinear absorption of Co:MgAl2O4 transparent ceramics was experimentally demonstrated. Both ground state absorption (σGSA) and excited state absorption (σESA) were estimated using the solid‐state slow saturable absorber model based on absorption saturation measurements performed at 1.535 μm. σGSA and σESA for 0.03 at.% Co:MgAl2O4 were found to be 4.1 × 10−19 cm2 and 4.0 × 10−20 cm2, respectively. In the case of 0.06 at.% Co:MgAl2O4 ceramics, σGSA = 2.6 × 10−19 cm2 and σESA= 5.3 × 10−20 cm2 were determined.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Absorption of Submicrometer Grain‐Size Cobalt‐Doped Magnesium Aluminate Transparent Ceramics

et al. 2014

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“…Active medium ytterbium and erbium doping concentrations were selected to be 4·10 27 and 5·10 25 m −3 , respectively. Yb, Er:glass and Co:MgAl 2 O 4 passive Q-switch parameters were taken from [12] and [16] respectively. Two-side transverse pumping of the cylindrical glass active element was assumed.…”

Section: Resultsmentioning

confidence: 99%

Amplified spontaneous emission induced peculiarities of the passively Q-switched diode pumped erbium laser dynamics

Bogdanovich¹,

Grigor’ev²,

Kabanov³

et al. 2010

Lithuanian J. Phys.

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The influence of amplified spontaneous emission (ASE) on the dynamic characteristics of transversely diode pumped erbium-ytterbium glass laser with Co:spinel Q-switch has been investigated. ASE cavity loss coefficient for passively Q-switched laser has been determined. The dependences of ASE cavity loss coefficient on the active element length, output mirror reflection coefficient, and initial transmission of the passive Q-switch have been defined. Laser dynamics has been modelled on the basis of the rate equation set for ion population densities and photon numbers, taking into account the amplified spontaneous emission. It has been shown that ASE accounting does not influence significantly the energy and duration of the output laser pulse. Variations of the laser turn-on time and pulse repetition rate of about 5-10% have been revealed in the case of ASE taken into consideration.

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“…17d). [57]. Figure 18 shows the corresponding functions of the nonlinear transmission at λ = 1.35 and 1.54 μm [57].…”

Section: Crmentioning

confidence: 96%

“…This reduces the point group symmetry of the dopant environment without changing the tetrahedral symmetry of the closest anions. It must also be pointed out that nonlinear (depending on the light intensity) absorption in isotropic crystals activated by transition-metal ions, the linear optical properties of which are not dependent on the polarization, is anisotropic, i.e., depends on the polarization and direction of propagation of radiation in the crystal [53][54][55][56][57].…”

Section: Crystalline and Glassy-crystalline Matrices For Tc Transitiomentioning

confidence: 99%

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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Anisotropy of nonlinear absorption in Co2+:MgAl2O4 crystal

Cited by 26 publications

References 6 publications

Nonlinear Absorption of Submicrometer Grain‐Size Cobalt‐Doped Magnesium Aluminate Transparent Ceramics

Nonlinear Absorption of Submicrometer Grain‐Size Cobalt‐Doped Magnesium Aluminate Transparent Ceramics

Amplified spontaneous emission induced peculiarities of the passively Q-switched diode pumped erbium laser dynamics

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

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