Journal of Nuclear Science, Engineering and Technology (JONSAT)
In cooperation with the Iranian Nuclear Society

Experimental study of the effects of gas pressure and resonator length on the CO2 laser pulse shape

Document Type : Scientific Note

Authors

S. Jelvani 1
K. Silakhori 1
S. Zare 2
M. Mollabashi 2
M. Ilchi 1
Z. Pourhasannejad 1
D. Ahadpour 1

1 Photonic and Quantum Technologies Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 14395-836, Tehran - Iran

2 Physics Department, Iran University of Science and Technology, Postal Code: 1684613114, Tehran - Iran

https://doi.org/10.24200/nst.2023.1373
Abstract
In this paper, the effect of various parameters on the pulse shape of the CO2 laser has been investigated. For this purpose, various parameters such as gas pressure and the length of the resonator were changed and the laser pulses shapes in each case along with their energy have been recorded. The results show that the output energy increases sharply with increasing gas pressure, so that when the pressure increases by factors of 2 and 3, the output energy increases by factors of 3 and 5 while the pulses duration reaches 0.5 and 0.3 and their buildup time reaches 0.9 and 0.7 of the initial values. In addition, by increasing the oscillator length, the width of the spike and especially of the tail parts of the pulses decease. To perform this series of experiments, a home-made laser with 1-3 atm operational pressure has been used

Highlights

1. M. Endo, R.F. Walter, Gas Lasers, CRC Press, )2007(.
 
2. S. Marchetti, R. Simili, Continuously Tunable Multi-Atmosphere Small Size CO2 TEA Laser, Optics & Laser Technology, 23, (1991).
 
3. G.A. Baranov, A.A. Kuchinsky, High-Power, High-Pressure Pulsed CO2 Lasers and their Applications, Quantum Electronics, 35(3), (2005).
 
4. O. Svelto, Principles of Lasers, 2nd edition, Springer, New York, (1982).
 
5. S. Beheshtipour, et al., Investigating the performance of plasma cutters of 2TEA CO lasers with nitrogen and argon gases, Iran Physics Conference, Yazd, (2016).
 
6. S. Beheshtipour, et al., The Effects of Focusing Power on TEA CO2 Laser-Induced Gas Breakdown and the Consequent Pulse Shaping Effects, Physics of Plasmas, 25, (2018).
 
7. C. Rolland, P.B. Korkum, Generation of 130-fsec Midinfrared Pulses, JOSA B, 3, (1986).
 
8. K. Silakhori, et al., A Small Size 1–3 atm Pulsed CO2 Laser with Series-Connected Spark Gaps Ultraviolet Preionization, Review of Scientific Instruments, 85(1), (2014).
 
9. K. Silakhori, et al., High Repetition Rate Pin-Array UV Pre-ionized CO2 Laser, Proc. SPIE, Vol. 6263, Tomsk, Russia, (2005).
 
10. K. Silakhori, et al., A Compact Injection Locked Single Longitudinal Mode TEA CO2 Laser, Proc. SPIE, Vol. 5777, Prague, Czech, (2004).

Keywords

Pulsed CO2 Laser
Pulse width
Gas pressure
Resonator length
1. M. Endo, R.F. Walter, Gas Lasers, CRC Press, )2007(.
 
2. S. Marchetti, R. Simili, Continuously Tunable Multi-Atmosphere Small Size CO2 TEA Laser, Optics & Laser Technology, 23, (1991).
 
3. G.A. Baranov, A.A. Kuchinsky, High-Power, High-Pressure Pulsed CO2 Lasers and their Applications, Quantum Electronics, 35(3), (2005).
 
4. O. Svelto, Principles of Lasers, 2nd edition, Springer, New York, (1982).
 
5. S. Beheshtipour, et al., Investigating the performance of plasma cutters of 2TEA CO lasers with nitrogen and argon gases, Iran Physics Conference, Yazd, (2016).
 
6. S. Beheshtipour, et al., The Effects of Focusing Power on TEA CO2 Laser-Induced Gas Breakdown and the Consequent Pulse Shaping Effects, Physics of Plasmas, 25, (2018).
 
7. C. Rolland, P.B. Korkum, Generation of 130-fsec Midinfrared Pulses, JOSA B, 3, (1986).
 
8. K. Silakhori, et al., A Small Size 1–3 atm Pulsed CO2 Laser with Series-Connected Spark Gaps Ultraviolet Preionization, Review of Scientific Instruments, 85(1), (2014).
 
9. K. Silakhori, et al., High Repetition Rate Pin-Array UV Pre-ionized CO2 Laser, Proc. SPIE, Vol. 6263, Tomsk, Russia, (2005).
 
10. K. Silakhori, et al., A Compact Injection Locked Single Longitudinal Mode TEA CO2 Laser, Proc. SPIE, Vol. 5777, Prague, Czech, (2004).

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