Evaluation of population densities of a rubidium laser pumped with a narrow-linewidth Ti:Sapphire laser

In the recent years, alkali vapor lasers have become the most promising candidates for realization of a light source with both good beam quality and high output power because of their excellent performances. A rubidium laser is a typical kind of alkali vapor lasers. In this study, we developed a theoretical mode to evaluate the population densities of three levels as well as mode-matching efficiency of a rubidium laser pumped by a narrow-linewidth Ti:Sapphire laser under two different focal conditions. In the evaluation, at least two values of the output power of a rubidium laser must be known, which are usually obtained from the experiment. We performed a series of experiments by using two pump lenses with two focal lengths of 150 and 200 mm, and acquired two corresponding values of the laser output power. Then, we applied the experimental results in the theoretical calculation and then obtained the population densities of three levels and mode-matching efficiency of the rubidium laser. The study demonstrates that the outputted pump power can be used for evaluation of the population densities of three levels and mode-matching efficiency of an alkali laser under the different experimental conditions. The study might be valuable to better understand the physical features of an alkali vapor laser and to optimize the configuration of a high-powered alkali laser in the future.

[1]  Boris V. Zhdanov,et al.  Optically pumped potassium laser , 2007 .

[2]  Raymond J. Beach,et al.  DPAL: A new class of lasers for cw power beaming at ideal photovoltaic cell wavelengths , 2004 .

[3]  Glen P. Perram,et al.  Limitations of an optically pumped rubidium laser imposed by atom recycle rate , 2011 .

[4]  V. K. Kanz,et al.  End-pumped continuous-wave alkali vapor lasers: experiment, model, and power scaling , 2004 .

[5]  V Keith Kanz,et al.  Resonance transition 795-nm rubidium laser. , 2003, Optics letters.

[6]  G. Perram,et al.  A three-level analytic model for alkali metal vapor lasers: part I. Narrowband optical pumping , 2010 .

[7]  D. Steck.  Rubidium 87 D Line Data , 2003 .

[8]  Xiaojun Xu,et al.  Modeling, numerical approach, and power scaling of alkali vapor lasers in side-pumped configuration with flowing medium , 2011 .

[9]  G. Perram,et al.  A pulsed, optically-pumped rubidium laser at high pump intensity , 2010 .

[10]  Xiaojun Xu,et al.  Modeling of an optically side-pumped alkali vapor amplifier with consideration of amplified spontaneous emission. , 2011, Optics express.

[11]  B. Barmashenko,et al.  Modeling of flowing gas diode pumped alkali lasers: dependence of the operation on the gas velocity and on the nature of the buffer gas. , 2012, Optics letters.

[12]  Randall J. Knize.  Diode Pumped Alkali Laser for Defense , 2016 .

[13]  Ralph H Page,et al.  Multimode-diode-pumped gas (alkali-vapor) laser. , 2006, Optics letters.

[14]  Weihong Hua,et al.  Theoretical model and novel numerical approach of a broadband optically pumped three-level alkali vapour laser , 2011 .

[15]  Glen P. Perram,et al.  Pressure broadening of the D1 and D2 lines in diode pumped alkali lasers , 2008, High-Power Laser Ablation.

[16]  Bailiang Pan,et al.  Thermal Effects in High-Power Double Diode-End-Pumped Cs Vapor Lasers , 2012, IEEE Journal of Quantum Electronics.

[17]  A Gourevitch,et al.  Efficient pumping of Rb vapor by high-power volume Bragg diode laser. , 2007, Optics letters.

[18]  Jason Zweiback,et al.  Modeling laser performance of scalable side pumped alkali laser , 2010, LASE.

[19]  R. Knize,et al.  Diode-pumped 10 W continuous wave cesium laser. , 2007, Optics letters.

[20]  V. A. Eroshenko,et al.  Diode-pumped caesium vapour laser with closed-cycle laser-active medium circulation , 2012 .

[21]  Jason Zweiback,et al.  High-energy transversely pumped alkali vapor laser , 2011, LASE.

[22]  Boris V Zhdanov,et al.  Rubidium vapor laser pumped by two laser diode arrays. , 2008, Optics letters.