A passively Q-switched dual-wavelength laser with pulsed LD coaxial end-pumped configuration

Zhang, Xianzhong; Zhong, Kai; Qiao, Hongzhan; Zheng, Yi; Li, Fangjie; Xu, Degang; Yao, Jianquan

doi:10.1117/12.2641747

Cited by 3 publications

(5 citation statements)

References 20 publications

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“…The model was tested by using it in numerical simulation of a laser system consist of Nd +3 : YAG used as AM and Cr +4 : YAG as a SA. The temporal behavior of each photons density of passive Q-switching pulse and population inversion density of AM ions resulting from the simulation showed good agreement with studies which dealt the theory of passive Q-switching (15)(16)(17) . This benchmark enhances reliability using the model.…”

Section: Methodssupporting

confidence: 75%

Rate Equations Model to Simulate the Dual Generation of Nd+3: YAG Passive Q-Switched Laser Pulses

Abdulhussain,

Salih

2023

IJST

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Objective: Rate equations model has been formulated to simulate the simultaneous generation of two passive Q-switching pulses using one active medium. It is possible to separate them and employ each pulse in practical applications. Methods: The model was solved numerically by used Rungkutta-Fahelberg method. This model was tested in the study of the effect of saturable absorber ( Cr +4 : YAG ) ions concentration on the duration, energy, and power of the dual pulses which are generation by passive Q-switching of Nd +3 : YAG. Finding: The results of the numerical solution showed that the temporal behavior of photons density of passive Q-switching pulses and the population inversion density of active medium is good agreement with studies which dealt the theory of passive Q-switching, which enhances reliability using this model. Novelty: The mathematical model included six rate equations instead of three or four rate equations. It is based to simulate the 4 F 3/2 , 4 I 11/2 , 4 I 9/2 spectrum lines as a 4-level and 3-level energy schemes of Nd +3 : YAG active medium to get two passive Q-switching laser pulses at the same time (instantaneously) instead of one pulse. Can be separated into two pulses to employ each of them in applications.

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Section: Methodssupporting

confidence: 75%

Rate Equations Model to Simulate the Dual Generation of Nd+3: YAG Passive Q-Switched Laser Pulses

Abdulhussain,

Salih

2023

IJST

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“…Passive Q-switched is one type of Q-switched techniques that were used to compress the laser energy to a narrow pulse to improve the power of the output laser pulses [1,2] . It relies on optical element called saturable absorber material (SA).…”

Section: Introductionmentioning

confidence: 99%

“…There are many practical applications of the pulses generated by this technique such as biomedicine, precision measurement, spectroscopy, medical treatment, lidars, material processing, nonlinear optics, and range finders [3][4]. The development of lasers has always been conditioned by the availability of suitable materials for their uses Cr +4 :YAG saturable absorber material is very suitable for working with Nd +3 :YAG as active medium (AM) in passive Q-switched optical system [2,4]. The optical system that was simulated in this study included Cr +4 :YAG and Nd +3 :YAG as a SA and AM, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Saturable Absorber Length on Characteristics of Dual Laser Pulses of Passive Q-Switched

A.Shadood,

Abdul-Kareem Mahdi Salih,

Asal

2024

UTJsci

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The effect of saturable absorber material length on the characteristics of the dual passive Q-switching pulses generated from two wavelengths ( and ) instead of single wavelength was simulated. Numerical solution of our previous rate equations model using Rung-Kutta-Fahelberg method has been utilized in simulation. Nd+3 :YAG using as an active medium, and Cr+4:YAG as a saturable absorber material. The results showed that the Nd+3:YAG dual passive Q-switching generated or released at an advanced(earlier) time and characterized by short duration times, high energy and high power with the increasing in the value of . The passive Q-switching for , are released respectively at time 58ns, 60 ns approximately at , while released at time 34 ns, 36 ns respectively approximately at . The duration time of , pulses approximate to 16.8ns, 14.6 ns respectively at , while approximate to 10.8 ns ,9.2 ns respectively at .

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“…Dual-wavelength lasers are great interest in wide applications such as terahertz generation, biomedicine, precision measurement spectroscopy, range-finding, spectroscopy, free space communication and laser surgery (1,2) . The generation of high-power pulses by subjecting these wavelengths to optical techniques it has received the attention of researches, the passive Q-switching technique (PQS) is one of these techniques, it is depends on the presence intracavity saturable absorber material (SA) (3,4) .…”

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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A passively Q-switched dual-wavelength laser with pulsed LD coaxial end-pumped configuration

Cited by 3 publications

References 20 publications

Rate Equations Model to Simulate the Dual Generation of Nd+3: YAG Passive Q-Switched Laser Pulses

Rate Equations Model to Simulate the Dual Generation of Nd+3: YAG Passive Q-Switched Laser Pulses

Effect of Saturable Absorber Length on Characteristics of Dual Laser Pulses of Passive Q-Switched

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

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