Advancements in flowing diode pumped alkali lasers

Pitz, Greg A.; Stalnaker, Donald M.; Guild, Eric M.; Oliker, Benjamin Q.; Moran, Paul J.; Townsend, Steven W.; Hostutler, David A.

doi:10.1117/12.2217078

Cited by 43 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Until recently the consensus was that K DPAL can work efficiently with hydrocarbon free He buffer. However, recent experiments performed in Air force Research Laboratory (AFRL), 6 US Air Force Academy (USAFA) 14,15 and Air Force Institute of Technology (AFIT) 16 showed that addition of a few percents of methane to He buffer gas results in substantial improvement of K DPAL operation. The DPAL 3D computational fluid dynamics (CFD) model developed in our previous works 17,18 was used to study the effect of the buffer gas composition on the performance of static K DPAL.…”

Section: Static K Dpal: Dependence Of the Performance On Addition Of ...mentioning

confidence: 99%

See 1 more Smart Citation

Advanced DPAL modeling

Barmashenko¹,

Waichman²,

Eliyahu-Caspi³

et al. 2022

XXIII International Symposium on High Power Laser Systems and Applications

View full text Add to dashboard Cite

Modeling of static K and Rb diode pumped alkali lasers (DPAL) and ion-electron recombination processes in these lasers is reported. The cases of He/CH4 and pure He buffer gases are investigated and the output power and optical efficiency calculated for various pump powers, mole fractions of methane, buffer gas pressures and flow velocities. The model considers the processes of excitation of high levels of K and Rb, ionization, ion-electron recombination and heating of electrons which affect the diffusion coefficient of K and Rb ions. It explains the experimentally observed sharp increase in power in static K DPAL caused by the addition of a few percent of methane to He buffer gas and its decrease with further increase in the methane percentage [B.V. Zhdanov et al, Opt. Exp. 25, 30793 (2017)]. The predictions of the model for different He/CH4 mixtures are presented and verified by comparing them with experimental results for K flowing-gas DPAL [A. J. Wallerstein, Ph.D. dissertation (Air Force Institute of Technology, 2018)] and with the calculated results obtained using a simplified three-level model based on one-dimensional gas dynamics approach reported by A. Gavrielides et al [J. Opt. Soc. Am. B 35, 2202 (2018)]. Calculations of potential energy curves of the 2 K + and 2 Rb + molecular ions and of the diabatic 1+, 3+, 1Δ, 3Δ, 1Π 3Π, 1Φ and 3Φ valence states of 2 K + and 2 Rb + that provide the routes for dissociative recombination (DR of the ions are performed. These curves are required for subsequent calculations of DR rate constants. The excited states of K atoms produced by DR are 42P and 52P. Most of the Rb atoms produced by DR are in the 62P excited state. This conclusion contradicts the kinetic scheme for K and Rb DPAL proposed elsewhere, and thus the kinetic schemes of these DPALs should be modified according to the present results.

show abstract

Section: Static K Dpal: Dependence Of the Performance On Addition Of ...mentioning

confidence: 99%

“…Consequently, due to the larger Boltzmann exponent, the population inversion density and, hence, the gain in Rb DPAL is much higher, and the threshold pump power is much lower than in the K laser. 3,5 There is only scarce information on experiments with high power Rb lasers, 6,7 but detailed theoretical studies are available.…”

Section: Introductionmentioning

confidence: 99%

Advanced DPAL modeling

Barmashenko¹,

Waichman²,

Eliyahu-Caspi³

et al. 2022

XXIII International Symposium on High Power Laser Systems and Applications

View full text Add to dashboard Cite

show abstract

“…Generally, the DPAL is a typical three-level laser using atomic alkali (K, or Rb, or Cs) vapor as the gain medium, whose quantum defect is much smaller than those of most of the conventional lasers [6][7][8]. Furthermore, the output linewidth of a DPAL is extremely narrow, the laser medium is nontoxic, and the DPAL system is generally compact [9][10][11]. Because of these excellent features, a DPAL can produce a high quality and high output power beam [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Bogachev firstly reported a 1 kW level DPAL by using a tubular gas flowing vapor cell [15]. Then, the team from Lawrence Livermore National Laboratory and US Air Force Academy [16,17], launched their experimental study of a tubular gas flowing DPAL system in succession. Until now, the output power of ~120 kW can be generated by adopting a tubular gas flowing alkali vapor cell [18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a new kind of gas-flowing diode pumped cesium laser

An¹,

Yang²,

Guo³

et al. 2022

Sixth International Symposium on Laser Interaction With Matter

View full text Add to dashboard Cite

A diode pumped alkali laser (DPAL) provides a significant potential for construction of high-powered lasers. To realize the scaling of a DPAL, heat management should be optimized. In this paper, a new kind of gas-flowing DPAL was proposed, in which a small cross-flow fan with diameter of 80 mm was set in the center of a cylindrical vapor cell whose diameter is 125 mm. The gain medium of cesium and the buffer gas of ethane were filled in the vapor cell with the total pressure is about 1 atmosphere. A mathematical model was constructed to systematically study the influence of the rotate speed, the heating temperature on the internal temperature distribution, and the output features of the laser.

show abstract

“…Besides, DPALs have presented considerable high amplification ability [19], for example, even a high amplification factor of 145 has been realized in a short 2 cm long alkali cell [20]. Recently, Pitz et.al have demonstrated a 571 W Rb based MOPA with a gain of 0.48 cm −1 [21]. And the gas phase medium in DPALs is more likely to preserve mode purity and stability of the seed laser.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of diode pumped rubidium amplifier for single higher-order Laguerre-Gaussian modes

Luo¹,

Li²,

Cui³

et al. 2016

Opt. Express

View full text Add to dashboard Cite

In this paper, we have set up a diode laser pumped rubidium amplifier for higher-order Laguerre-Gauss (LG) modes. We experimentally realized amplification of higher-order LG modes including helical and sinusoidal LG₀₃, LG₁₃, LG₂₃, and LG₃₃ modes with their high purity held. This novel scheme of generating high-purity higher-order LG beams at high laser power is preferred to the second-generation gravitational wave interferometers. To the best of our knowledge, it is the first time this scheme is formulated.

show abstract

Advancements in flowing diode pumped alkali lasers

Cited by 43 publications

References 10 publications

Advanced DPAL modeling

Advanced DPAL modeling

Investigation of a new kind of gas-flowing diode pumped cesium laser

Experimental study of diode pumped rubidium amplifier for single higher-order Laguerre-Gaussian modes

Contact Info

Product

Resources

About