Spectroscopic Properties of Nd:YAG Laser and Its Performance

Seyed Ebrahim Pourmand
Estahban Branch, Islamic Azad University, Estahban, Iran

Iraj Sadegh Amiri
Ton Duc Thang University, Ho Chi Minh City, Vietnam

Abdolkarim Afroozeh
Fasa University, Fasa, Iran.

Volker J. Sorger
The George Washington University, Washington, D.C., USA

Xi Ling
Boston University, Boston, MA, USA

Series: Materials Science and Technologies
BISAC: TEC021000

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The purpose of this book was to investigate the temperature and input energy dependency of Nd:YAG laser performance pumped by flashlamp. A commercial laser rod Nd:YAG laser crystal was utilized as a gain medium. The laser rod was placed parallel to a linear flashlamp filled by xenon gas at 450 Torr. The Nd:YAG crystal together with the flashlamp was flooded with a coolant comprising of a mixture with 60% ethylene glycol and 40% distilled water, which covers a range of temperature from -30C to +60C. Spectroscopic properties of the Nd:YAG rod under pulsed flashlamp pumping was investigated from the output fluorescence spectrum of the flashlamp radiation and the Nd:YAG rod. The linewidth of each fluorescence line was measured for an estimation of an effective emission cross section and saturation intensity.

The influence of temperature and input energy on a fluorescence emission cross section of Nd3+:YAG crystal was studied. The cross-section was found to decrease as the temperature and the input energy was increased. The inter-stark emission showed a Lorentzian line shape indicating homogeneous broadening. This was attributed to the thermal broadening mechanism of the emission line. The spectral widths and shifts of the emission lines for the three and four level inter-Stark transitions within the respective intermanifold transitions of 4F3/2→4I9/2 and 4F3/2→4I11/2 were investigated over the range of 0 to 75 J.

The emission lines for the 4F3/2→4I9/2 transitions shifted towards a longer wavelength and broadened, while the positions and linewidths for the 4F3/2→4I11/2 transitions remained unchanged with the increase of input energy. Finally, the temperature dependence of quasi-three-level laser transitions for long pulse Nd:YAG laser was also investigated. The laser performances at both 938.5 nm and 946.0 nm were also found to be inversely proportional to temperature, and the slope efficiency was unchanged with temperature. The reduction was due to the mechanism of phonon scattering as well as a broadening effect while the temperature increased.

Preface

Chapter 1. Introduction of Flashlamp Pumped Nd:YAG Laser (pp. 1-10)

Chapter 2. Concepts and Principle Working of Nd:YAG Laser (pp. 11-64)

Chapter 3. Research Methodology of Nd3+:YAG Laser Pumped by Flashlamp (pp. 65-76)

Chapter 4. Spectroscopic Results and Discussion on the Fluorescence Spectrum of the Pump Source to Excite Nd:YAG Laser Rod as Flashlamp (pp. 77-116)

Chapter 5. Conclusion and Future Work of Nd:YAG Laser (pp. 117-122)

About the Authors (pp. 123-124)

Index (pp. 125)

Total Pages: 128

Chapter 1

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Chapter 2

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Chapter 3

[1] Zainal, R. (2011). Design and construction of free running and variable repetitive rate of flashlamp pumped Nd:YAG Laser. PhD thesis, Universiti Teknologi Malaysia.

Chapter 4

[1] Rui, Z., Zhiqiang, C., Wuqi, W., Xin, D., Peng, W. & Jianquan, Y. (2005). “High-power continuous-wave Nd:YAG laser at 946 nm and intracavity frequency-doubling with a compact three-element cavity”, Opt. Commu., 255, 304-308.

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