Absorption and oscillation characteristics of a pulsed Cr/sup 4+/:YAG laser investigated by a double-pulse pumping technique

Suda, Akira; Kadoi, A.; Nagasaka, Kenshiro; Tashiro, Hatsuzo; Midorikawa, Katsumi

doi:10.1109/3.792592

Cited by 18 publications

(8 citation statements)

References 14 publications

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“…The realization of the double pulse pumping process is reported in details in [11,12]. The realization of the double pulse pumping process is reported in detail in [11,12].…”

Section: Crmentioning

confidence: 99%

“…It has been reported in [3,5,11,12] that the models of similar problems describing the absorption and oscillation processes by single and double pumping pulse have been achieved by different considerations for the pumping process. In fact, these models did not consider the influence of the variation of the source's pumping polarized laser power from one operation to another.…”

Section: Crmentioning

confidence: 99%

“…The suggested mathematical model, presented in this work, is built on some basic ideas from different models reported in [10][11][12][13]. This developed model describes the Nd-polarized laser pumping source, the partial polarizer and the isotropic Cr 4+ :YAG polarized solid-state saturable absorber.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The time evolution of the population density of the first excited-state of polarized solid-state saturable absorber (Cr 4+ :YAG) is given by the following relation (taking into account that the orientation of the dipole moments of Cr 4+ active centers in this state at each moment is perpendicular on the dipole moments orientation in the ground state) [11,12]: dN…”

Section: Polarized Solid-state Saturable Absorber Mediummentioning

confidence: 99%

“…The double pulse pumping is expressed mathematically through the existence of the assumed intermediate level [11]. Suppose that N The time evolution of population density of the lower laser level of isotropic Cr 4+ :YAG polarized crystal of the polarization ellipse is given by the following relation [11][12][13]: dN…”

Section: Polarized Solid-state Saturable Absorber Mediummentioning

confidence: 99%

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Modeling the Dynamic Emission of a Polarized Cr⁴⁺:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

Ghani

Hammadi

2009

Acta Phys. Pol. A

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A mathematical model describing the dynamic emission of intracavity polarized isotropic Cr 4+ :YAG solid--state saturable absorber was developed. This model considers double pumping laser pulses to simulate the actions of Cr 4+ :YAG as a dual Q-switched crystal (1.06 µm) and lasing medium (1.4 µm). The model describes the time evolution of interaction between the pumping laser pulse, partial polarizer and the polarized saturable absorber. The analysis of the polarization process is based on the assumption that at each moment of lasing evolution, the state of polarization represented by an eigenstate corresponds to the lowest radiation losses state. The model offers a simple mechanism for studying the kinetics of the pulsed lasers and the influence of the variations of the pumping laser power and nonlinear anisotropy parameter on the characteristics of the output laser pulses 1.06 µm and 1.4 µm. The angular rotation of the passive switch Cr 4+ :YAG reveals that the transmission of the polarized 1.06 µm laser radiation is strongly anisotropic in the saturation regime. The suggested model estimates the transmission of pumping laser density of the polarized light 1.06 µm radiation as a function of nonlinear anisotropy parameter, temporal behavior of the relative population inversion of Nd-laser, population inversion of the different polarized levels of Cr 4+ :YAG pulsed laser and the output laser pulse densities under impact of different values of the nonlinear anisotropy which is due to the self-induced anisotropy of its saturated absorption.

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“…The realization of the double pulse pumping process is reported in details in [11,12]. The realization of the double pulse pumping process is reported in detail in [11,12].…”

Section: Crmentioning

confidence: 99%

Section: Crmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Polarized Solid-state Saturable Absorber Mediummentioning

confidence: 99%

Section: Polarized Solid-state Saturable Absorber Mediummentioning

confidence: 99%

See 3 more Smart Citations

Modeling the Dynamic Emission of a Polarized Cr⁴⁺:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

Ghani

Hammadi

2009

Acta Phys. Pol. A

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High-power passively Q-switched Nd:YVO4 UV laser at 355 nm

et al. 2011

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We report on an efficient high-power passively Q-switched UV laser at 355 nm. We take into account the second threshold criterion and the thermal-lensing effect to design and realize a compact reliable passively Q-switched Nd:YVO 4 laser with Cr 4+ :YAG as a saturable absorber. At an incident pump power of 16.3 W, the average output power at 1064 nm reaches 6.2 W with a pulse width of 7 ns and a pulse repetition rate of 56 kHz. Employing the developed passively Q-switched laser to perform the extra-cavity harmonic generations, the maximum average output powers at 532 nm and 355 nm are up to 2.2 W and 1.62 W, respectively.

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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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Absorption and oscillation characteristics of a pulsed Cr/sup 4+/:YAG laser investigated by a double-pulse pumping technique

Cited by 18 publications

References 14 publications

Modeling the Dynamic Emission of a Polarized Cr⁴⁺:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

Modeling the Dynamic Emission of a Polarized Cr⁴⁺:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

High-power passively Q-switched Nd:YVO4 UV laser at 355 nm

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

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Absorption and oscillation characteristics of a pulsed Cr/sup 4+/:YAG laser investigated by a double-pulse pumping technique

Cited by 18 publications

References 14 publications

Modeling the Dynamic Emission of a Polarized Cr4+:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

Modeling the Dynamic Emission of a Polarized Cr4+:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

High-power passively Q-switched Nd:YVO4 UV laser at 355 nm

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

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Product

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Modeling the Dynamic Emission of a Polarized Cr⁴⁺:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser

Modeling the Dynamic Emission of a Polarized Cr⁴⁺:YAG Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser