We present a solid-state laser system that generates 750 mW of continuous-wave single-frequency output at 313 nm. Sum-frequency generation with fiber lasers at 1550 nm and 1051 nm produces up to 2 W at 626 nm. This visible light is then converted to UV by cavity-enhanced second-harmonic generation. The laser output can be tuned over a 495 GHz range, which includes the 9Be+ laser cooling and repumping transitions. This is the first report of a narrow-linewidth laser system with sufficient power to perform fault-tolerant quantum-gate operations with trapped 9Be+ ions by use of stimulated Raman transitions.

A 750 mW, continuous-wave, solid-state laser source at 313 nm for cooling and manipulating trapped 9Be+ ions

We present a solid-state laser system that generates 750 mW of continuous-wave, single-frequency output at 313 nm. Sum-frequency generation with fiber lasers at 1550 and 1051 nm produces up to 2 W at 626 nm. This visible light is then converted to ultraviolet by cavity-enhanced second-harmonic generation. The laser output can be tuned over a 495-GHz range, which includes the 9Be+ laser cooling and repumping transitions. This is the first report of a narrow-linewidth laser system with sufficient power to perform fault-tolerant quantum-gate operations with trapped 9Be+ ions by use of stimulated Raman transitions.

/pdf/a-750-mw-continuous-wave-solid-state-laser-source-at-313-nm-3m6o8mmv34.pdf

A 750-mW, continuous-wave, solid-state laser source at 313 nm for cooling and manipulating trapped 9 Be + ions

One can enhance second-harmonic generation in angle-tuned crystals by focusing the fundamental to an elliptical waist in the crystal. We present a general analysis for type I phase-matched uniaxial and biaxial crystals that will find particular application in the generation of harmonics from diode lasers.

/pdf/general-analysis-of-type-i-second-harmonic-generation-with-2uwssz01jr.pdf

General analysis of type I second-harmonic generation with elliptical Gaussian beams

Optimum conditions for elliptical focusing are derived for singly resonant optical parametric oscillators with hemispherical resonator in dependence on double refraction. By elliptical focusing it is possible to focus more tightly in the non-walk-off plane. In a LiNbO3 oscillator pumped with 1,06 μm radiation the threshold pump power can be lowered about a factor 6 by elliptical focusing in comparison with circular focusing.



Optimale Bedingungen fur elliptische Fokussierung bei einfachresonanten optisch-parametrischen Oszillatoren mit hemispharischem Resonator



Es werden optimale Bedingungen fur elliptische Fokussierung bei einfach resonanten optisch-parametrischen Oszillatoren mit hemispharischem Resonator bei Berucksichtigung der Doppelbrechung abgeleitet. Bei elliptischer Fokussierung ist es moglich, in der zum Hauptschnitt senkrechten Ebene starker zu fokussieren. Es ergibt sich, das fur einen LiNbO3-Oszillator bei einer Pumpwellenlange von 1,06 μm die Schwellenleistung fur die Pumpwelle im Vergleich zum Fall der kreisformigen Fokussierung durch elliptische Fokussierung um einen Faktor 6 erniedrigt werden kann.

Tran Bá Chu

Papers

Optimum Conditions for Elliptical Focusing in Singly Resonant Optical Parametric Oscillators with Hemispherical Resonator