An experimental and theoretical study of high repetition rate Q-switched Nd: YA1G lasers

Chesler, R. B.; Karr, M. A.; Geusic, J. E.

doi:10.1109/proc.1970.8062

Cited by 94 publications

(11 citation statements)

References 13 publications

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“…The power of laser radiation and also the pulse energy can vary in a very wide range depending on a mode of laser operation [6][7][8]. Here, we do not deal with the changes of radiation power generated by the real laser.…”

Section: Selected Results Of Numerical Calculationsmentioning

confidence: 99%

Numerical Modelling of Laser Cleaning and Conservation of Artworks

Marczak

Jach

Sarzyński

2005

Springer Proceedings in Physics

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Abstract. Laser radiation is often used in cleaning and conservation of artworks. Interaction of laser radiation with matter is so sophisticated process that analytical solutions rarely bring the valuable formulas. Even numerical methods seldom give quantitative insight into the physics of processes. Chemical and physical properties of surface impurity layers may change from point to point within the same sample. In spite of this, theoretical description of laser cleaning is necessary, as it allows to explain some characteristic features of processes under investigation. In this work we present a model for laser pulse interaction with graphite layer placed on aluminium substrate. The model is limited to one dimensional hydrodynamic equation. Numerical calculations and experimental results give a qualitative agreement.

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Section: Selected Results Of Numerical Calculationsmentioning

confidence: 99%

Numerical Modelling of Laser Cleaning and Conservation of Artworks

Marczak

Jach

Sarzyński

2005

Springer Proceedings in Physics

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“…An explanation of damped oscillations was previously derived from the rate equations given by Statz and De Mars 7 and observed by several authors.s For a cavity with H.R. mirrors it has been shown that 2 cp=2(Xd/X) (2) where X= decay constant of the laser transition~4.5X loa sec-I, Xd= damping constant of the relaxation oscillations, w r = angular relaxation oscillation frequency.…”

Section: Cavity Dumpingmentioning

confidence: 89%

“…The build-up time is a function of the various cavity parameters and the population inversion. 2 The coupling pulse, shown in Fig. 3 reaches its maximum.…”

Section: A Apparatusmentioning

confidence: 95%

“…These systems were based on rotating mirrors l or acoustic diffraction cells. 2 The finite build-up time of the field inside the laser cavity and the time required to repump the inversion set an upper limit to the repetition rate available from Qswitched lasers. It has been shown 2 that this maximum value of repetition rate for Q-switched Nd:YAIG lasers is of the order of 50 kHz.…”

Section: Introductionmentioning

confidence: 99%

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Q-Switching and Cavity Dumping of Nd:YAlG Lasers

Maydan¹,

Chesler²

1971

Journal of Applied Physics

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Experiments in Q-switching and cavity dumping of a Nd:YAIG laser have been carried out. The system in either case is composed of a Nd:YAIG folded cavity laser and an intracavity acousto-optic modulator made of fused silica and Brewster cut. Q-switching is achieved by first feeding the modulator with an acoustic pulse of sufficient duration and intensity to keep the laser below threshold (hold off pulse). Termination of the acoustic pulse allows the power inside the laser cavity to build up. A second short acoustic pulse, introduced to the modulator at the time when the internal energy reaches its maximum, couples the energy out of the cavity. This pulse may also be the beginning of the hold off pulse. Cavity dumping is accomplished by feeding the modulator with short acoustic pulses at fixed intervals. In the Q switching mode the system can operate with a maximum repetition rate of about 30 kHz. In the cavity dumping mode of operation the repetition rate of the light pulses can be controlled from 125 kHz to several MHz. The minimum pulse duration obtained in both modes of operation was about 80 nsec. The average power can reach 2 W, which is the maximum cw power capability of the laser used.

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“…12 . Additional pumping along axis 3 produced 1.6 W, comparable to the power reported above for pumping along axes 1 and 2 with two polarization-combined 1 W diodes and the 3 W diode, respectively.…”

Section: Internally Folded Penta-prismmentioning

confidence: 99%

<title>Scalable, internally folded Nd:YAG laser end-pumped by laser diodes</title>

Scheps

Myers

1993

SPIE Proceedings

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Two internally folded, scalable laser resonator designs have been demonstrated. One, based on an isosceles right angle prism, was pumped along three axes simultaneously with 3.73 W at 808 nm. It produced 1.3 W at 1.06 i with no evidence of thermal saturation. In addition, good second harmonic conversion efficiency was achieved and 128 mW of low noise output was obtained. The second design is based on a penta-prism. Using five single stripe laser diodes to pump along three separate axes, 4.16 W of absorbed power produced 2.3 W in the TEMØ0 mode. The slope efficiency was 56%, the optical conversion efficiency was 55%, and the output was linearly polarized. No evidence of thermal saturation was observed up to the maximum pump power used and high conversion efficiency was maintained over the entire range of pump power. The pump threshold power was 48 mW. With an intracavity KTP crystal, 341 mW of cw amplitude-stable output at 532 nm was generated.

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An experimental and theoretical study of high repetition rate Q-switched Nd: YA1G lasers

Cited by 94 publications

References 13 publications

Numerical Modelling of Laser Cleaning and Conservation of Artworks

Numerical Modelling of Laser Cleaning and Conservation of Artworks

Q-Switching and Cavity Dumping of Nd:YAlG Lasers

<title>Scalable, internally folded Nd:YAG laser end-pumped by laser diodes</title>

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