Algorithm of RF-excited slab-waveguide laser design

Pliński, Edward F.; Witkowski, Jerzy S.; Abramski, Krzysztof M.

doi:10.1088/0022-3727/33/15/311

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…The gas mixture is typical for this kind of laser: it contains gases CO 2 The first experimental arrangement contains three-mirror resonator, see Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

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Acoustic measurement method in investigation of optical phenomena in a modulated CO 2 laser plasma

et al. 2007

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The paper describes the results of investigations of optical phenomena on an RF excited slab-waveguide CO 2 laser. The experiments are performed in two optical arrangements: two-mirror resonator and three-mirror one. The main purpose of the experiments is to check possibilities to observe the optical phenomena using a microphone. The laser plasma is modulated with a self-mixing signal in the three-mirror resonator. The response of the microphone is observed and analyzed. Detection of the laser signature phenomenon with the microphone is experimentally considered. The experiments are done at cw regime of the laser. The investigations are performed at pulse operation of the laser, as well. The response of the microphone is analyzed. It is checked how the laser pulse is reconstructed at a profile of the microphone signal. The output laser pulse with a mapped laser signature in the laser pulse profile is compared to the microphone signal shape. The presence of the laser signature at the acoustic signal is investigated.

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“…The gas mixture is typical for this kind of laser: it contains gases CO 2 The first experimental arrangement contains three-mirror resonator, see Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

“…One of the more sophisticated optical phenomenon is a "line hoppings" effect when an optical length of resonator is being changed. It leads to some very specific for CO 2 laser parameter called the "laser signature" [1,2,3]. Laser signature is a picture of the laser output power changes when the laser is tuned of a half-wavelength.…”

Section: Introductionmentioning

confidence: 99%

Acoustic measurement method in investigation of optical phenomena in a modulated CO 2 laser plasma

et al. 2007

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“…It is especially visible in slab-waveguide laser heads, where the plasma sheaths appearing along the surface of the electrodes introduce some additional capacity to the laser head. As known, the resonant frequency of the cold laser head should be higher than the frequency of the power generator to obtain a perfect match when the laser plasma is on [5]. The laser worked at the optimum 70 Torr pressure with a typical He:N 2 :CO 2 = 3:1:1 gas mixture.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic processes in an RF pulsed excited CO 2 slab-waveguide laser

et al. 2004

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A pulsed excitation of the laser plasma in gas lasers creates an acoustic wave in the laser reservoir. It changes thermodynamic parameters of the laser plasma in the laser cavity like pressure, and temperature, as well, and consequently it changes the density of the laser plasma, or, in other words, the refractive index of the laser medium. Tuning laser frequency during the pulse developing is observed as a result. The measurements of the pressure, temperature, and refractive index changes in an RF pulsed excited CO 2 slab-waveguide laser are purposes of the work. The pressure changes are measured with calibrated microphones situated close to the laser plasma. The temperature changes are calculated via measured refractive index characteristics, and simple formulas linking the refractive index with the gas density. The picture of the acoustic wave propagation in the laser cavity is presented. The obtained results give the picture of the laser plasma behavior during the pulsed excitation. It leads to a single frequency pulsed laser operation design.

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“…As checked, the 40 Torr pressure of the gas laser mixture is enough to detect the acoustic signal with a microphone (the signal disapears at the pressure of 10 Torr). The laser plasma is excited by radio frequnecy RF current of 125 MHz delivered by a 2 kW generator via a matching circuit 5 . The power generator can be remote controlled with a square signal from a function generator to get a laser pulse operation.…”

Section: Experimental Arrangementmentioning

confidence: 99%

Acoustics of the RF pulsed excited CO 2 laser discharge

et al. 2005

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The paper presents studies on influence of the gas laser cavity shape on an acoustic wave created in the cavity. Results of investigations on an RF excited CO 2 slab-waveguide laser are shown. As is demonstrated, rapid changes of a laser plasma pressure appear in the laser gas mixture as a consequence of the pulsed RF discharge in the laser. The pressure variations create an acoustic wave propagated in the laser chamber, and involve changes of the refractive index of an excited plasma. As a result, the frequency of the optical wave emitted by the laser changes -a "line hoppings" effect appears. In the case of the slab-waveguide laser an acoustic wave propagates in a closed space -the laser reservoir, that is a special kind of an acoustic resonator. As known, a material from which cavity is made, a shape of the walls and their mutual position are significant for a wave propagation. In the experiment, the walls of the chamber are made of aluminum, so it is a very reflecting area. More, the walls are parallel that is an advantageous condition for creating standing waves. The aluminum wedges were used in the experiment to change the geometry of the reservoir. The influence of pulse duration time on the acoustic signal is investigated.

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Algorithm of RF-excited slab-waveguide laser design

Abstract: Basic mechanisms influencing the resonant frequency of the RF-discharged slab-waveguide CO2 laser head are described. An algorithm of calculations to design a laser head resonant frequency is given. The algorithm is experimentally confirmed.

Cited by 9 publications

References 10 publications

Acoustic measurement method in investigation of optical phenomena in a modulated CO 2 laser plasma

Acoustic measurement method in investigation of optical phenomena in a modulated CO 2 laser plasma

Thermodynamic processes in an RF pulsed excited CO 2 slab-waveguide laser

Acoustics of the RF pulsed excited CO 2 laser discharge

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