Rate Equations Model to Simulate the Performance of Passive Q-Switched Laser with Raman Medium Optical System

,; Saad, Dunya; Hussein, Hussein; Salih, Abdulkareem Mahdi

doi:10.17485/ijst/v16i39.1744

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…A mathematical rate equations model (14) , as shown in the Equations ( 1), ( 2), ( 3), ( 4), ( 5) and (6) has been used to study the effect of active medium length on the characteristic of PQS, Stokes, and anti-Stokes pulses where generates by optical system.…”

Section: Methodsmentioning

confidence: 99%

Study of Active Medium Length Effect on Characteristics of Passive QSwitching and Stokes with Anti-Stokes Pulse

Hussein,

Salih

2024

IJST

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Objective: To study the effect of active medium length on the characteristics of passive Q-switching pulses, Stokes pulses, and anti-Stokes pulses generated by laser-Raman medium interaction in optical systems, theoretically. Methods: The optical system consists of Nd+3:YVO4, PbWO4, and Cr+4:YAG as active mediums, Raman medium, and saturable absorber materials, respectively. The rate equations model has been used in the study, and the Rung-Kutta-Fehelberg numerical method was used to solve the rate equations. Finding: The result shows that, decreasing of the active medium length leads to emit high power pulses at advanced time. It also leads to increase in initial value and the maximum value of population inversion density, and leads to increase in the energy of passive Q-switching pulses, Stokes pulses, and anti-Stokes pulses. So the decreasing of the active medium length leads to decrease in the pulses duration and the final population inversion density. To increase the power of the three generated pulses, the length of the active medium used in the system must be decreased. Novelty: The characteristics of two pulses generated by Laser-Raman interaction (passive Q-switching pulse and Stokes pulse) have been of interest in some studies. This study investigates the effect of the active medium length on the characteristics of three pulses generated (anti-Stokes pulse with Stokes pulse as well as the passive Q-switching pulses) by the optical system rather than two pulses. Keywords: Laser; Nd+3 :YVO4; passive Q-switching pulse; Stokes and anti-Stokes pulses 1

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Section: Methodsmentioning

confidence: 99%

Study of Active Medium Length Effect on Characteristics of Passive QSwitching and Stokes with Anti-Stokes Pulse

Hussein,

Salih

2024

IJST

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“…A mathematical rate equations model [15], as shown in Equations (1)(2)(3)(4)(5)(6) has been used to study the effective of the SA length on characteristic of PQS, Stokes and anti-Stokes pulses where generated simultaneously in optical laser system. Figure 2A : Absorption spectrum of Cr 4+ :YAG [7] shift , is Raman medium length, is the anti-Stoke photon frequency, , is the life time of laser photon in the cavity…”

Section: Theorymentioning

confidence: 99%

Investigation of Saturable Absorber Length Effect on Characteristics of Passive Q-Switching and Stokes with Anti-Stokes Pulses Generated in Laser System of Nd:YVO4

Saad,

Abdul-Kareem Mahdi Salih,

Asal

2024

UTJsci

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The effect of the saturable absorbent material on the characteristics of a single laser pulse results from the passive Q-switching method, or two pulses. The first pulse is resulted from the passive Q-switching method and the other is resulted from Stokes pulse generated by the laser ray reaction with the Raman medium in the optical system. This study simulated this effect on the characteristics of three pulses (passive Q-switching pulse, Stokes pulse, and anti-Stokes pulse) simultaneously generated from one optical system . The optical system consists of Nd: YVO4, PbWO4, and Cr + 4: YAG as an effective medium, Raman medium, and saturable absorbent material, respectively. The modeling of the rate equations was used, and the Rung-Kutta-Fehelberg numerical method was used to solve the rate equations. The results show increased power of the pulses generated, requiring an increased length of the saturable absorber material used in the system. The results showed that at the shortest length used for the saturated absorbent material, the pulse duration and energy of the three generated pulses were PQS pulse (16.44ns, 1.39mJ), Stokes pulse (12.59ns, 1.148mJ) and anti-Stokes pulse (13.53ns, 1.59mJ), while at the longest length of the saturated absorbent material, the pulse duration and energy were PQS pulse (14.68ns, 1.50mJ), the Stokes pulse (11.41ns, 1.36mJ) and the anti-Stokes pulse (12.38ns, 1.86mJ).

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“…The energy level scheme of Cr +4 :YAG as shown in Figure 1 (8) . The absorption of the pump wavelength occurs at the 1-3 transition.…”

Section: Introductionmentioning

confidence: 99%

Absorption Activity Investigation of Saturable Absorber for Dual Wavelengths in Laser Passive Q-Switching System

Hussien,

Salih

2024

IJST

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Objective: The absorption activity of saturable absorber material (Cr+4: YAG) for dual wavelengths (1.064 μm and 0.946 μm), simultaneously generated in same passive Q-switching system, has been investigated. Methods: This study utilized the mathematical model that was used in our previous study. Rung-Kutta—Fehelberge numerical method has been used to solve this mathematical model. Nd+3: YAG used as an effective medium and Cr+4: YAG used as a saturable absorber in the laser passive Q-switching optical system. Finding: When the population density of saturable absorber increases, the steady state of photons losses occurs at advancement time and the absorption activity reaches to optical bleaching state at advancement time also (it is occurring approximately at time 35 ns from the beginning of the time of pulse construction when the , while at , approximately at time 47 ns). Novelty: The absorption activity of saturable absorber material for a single wavelength of photons oscillating inside the passive Q-switch laser system received attention by some studies. This study verifies or investigates from the behavior of absorption activity of saturable absorber material when encounters photons with two wavelengths oscillating simultaneously inside the laser cavity in order to obtain high power of the pulses. Keywords: Laser, Passive Qswitching, laser, Dual wavelengths laser, Solid state lasers

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Rate Equations Model to Simulate the Performance of Passive Q-Switched Laser with Raman Medium Optical System

Cited by 3 publications

References 13 publications

Study of Active Medium Length Effect on Characteristics of Passive QSwitching and Stokes with Anti-Stokes Pulse

Study of Active Medium Length Effect on Characteristics of Passive QSwitching and Stokes with Anti-Stokes Pulse

Investigation of Saturable Absorber Length Effect on Characteristics of Passive Q-Switching and Stokes with Anti-Stokes Pulses Generated in Laser System of Nd:YVO4

Absorption Activity Investigation of Saturable Absorber for Dual Wavelengths in Laser Passive Q-Switching System

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