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Conference on Lasers and Electro-Optics

Developments toward a reliable diode-pumped hydrocarbon-free 795-nm Rubidium laser

Sheldon S. Q. Wu, Thomas F. Soules, Ralph H. Page, Scott C. Mitchell, V. Keith Kanz, Raymond John Beach

Published May 1, 2008• 0 citations
Publisher

Abstract

We report a 795-nm diode-pumpable Rb laser using a buffer gas of pure3He.3He gas enhances mixing of the Rb fine-structure levels. This enables efficient lasing at reduced He pressures and improved thermal management.
DOI
10.1109/cleo.2008.4551080

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Resonance transition rubidium laser (52P1/2→52S1/2) is demonstrated with a hydrocarbon-free buffer gas. Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing. However, our experience suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products. This degrades long term laser reliability. Our recent experimental results with a "clean" helium-only buffer gas system pumped by a Ti:sapphire laser demonstrate all the advantages of the original alkali laser system, but without the reliability issues associated with the use of ethane. We further report a demonstration of a rubidium laser using a buffer gas consisting of pure 3He. Using isotopically enriched 3He gas yields enhanced mixing of the Rb fine-structure levels. This enables efficient lasing at reduced He buffer gas pressure, improved thermal management in high average power Rb lasers and enhanced power scaling potential of such systems.
Resonance transition rubidium laser (5 2 P 1/2 →5 2 S 1/2 ) is demonstrated with a hydrocarbon-free buffer gas.Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing.However, our experience suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products.This degrades long term laser reliability.Our recent experimental results with a "clean" helium-only buffer gas system pumped by a Ti:sapphire laser demonstrate all the advantages of the original alkali laser system, but without the reliability issues associated with the use of ethane.We further report a demonstration of a rubidium laser using a buffer gas consisting of pure 3 He.Using isotopically enriched 3 He gas yields enhanced mixing of the Rb fine-structure levels.This enables efficient lasing at reduced He buffer gas pressure, improved thermal management in high average power Rb lasers and enhanced power scaling potential of such systems.
An optical resonance transition rubidium laser (52P1/2 → 52S1/2) is demonstrated with a hydrocarbon-free buffer gas. Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing. However, our experience suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products. This degrades long term laser reliability. Our recent experimental results with a "clean" helium-only buffer gas system pumped by a Ti:sapphire laser demonstrate all the advantages of the original alkali laser system, but without the reliability issues associated with the use of ethane.
For what we believe to be the first time, an optical resonance transition rubidium laser (5(2)P(1/2)-->5(2)S(1/2)) has been demonstrated with a hydrocarbon-free buffer gas. Prior demonstrations of alkali resonance transition lasers have used ethane as either the buffer gas or a buffer gas component to promote rapid fine-structure mixing. However, our experience suggests that the alkali vapor reacts with the ethane producing carbon as one of the reaction products. This degrades long term laser reliability. Our recent experimental results with a "clean" helium-only buffer gas system demonstrate all the advantages of the original alkali laser system, but without the reliability issues associated with the use of ethane.
A continuous-wave, three-level rubidium atom laser, operating on the 795 nm first (D1) resonance transition, has been demonstrated for the first time. Using a Titanium Sapphire laser as a pump source, a slope power efficiency of 54% was obtained, consistent with homogeneous broadening of the rubidium pump and laser transitions. The end-pumped rubidium laser performance was well described using literature spectroscopic and kinetic data in a model that takes into account ground level depletion and pump spectral bandwidth that is substantially larger than the collisionally broadened pump transition spectral width.