Dr. Dieter H. Jundt Profile

Dr. Dieter H. Jundt

at Jundt Consulting

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Author

Publications (4)

Proceedings Article | 20 February 2015 Paper

Lithium niobate Q-switch to prevent pre-lasing of high gain lasers operating over a wide temperature range

Dieter Jundt, Peter MacKay

Proceedings Volume 9346, 93460M (2015) https://doi.org/10.1117/12.2079915

KEYWORDS: Q switching, Absorption, Crystals, Q switched lasers, Diffusion, Lithium niobate, Polishing, Surface finishing, Polarons, Temperature metrology

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Proceedings Article | 7 October 2014 Paper

Temperature-stable lithium niobate electro-optic Q-switch for improved cold performance

Dieter Jundt

Proceedings Volume 9251, 92510F (2014) https://doi.org/10.1117/12.2066667

KEYWORDS: Q switching, Absorption, Crystals, Diffusion, Polishing, Q switched lasers, Surface finishing, Electro optics, Polarons, Semiconducting wafers

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Lithium niobate (LN) is commonly used as an electro optic (EO) Q-switch material in infrared targeting lasers because of its relatively low voltage requirements and low cost compared to other crystals. A common challenge is maintaining good performance at the sub-freezing temperatures often experienced during flight. Dropping to low temperature causes a pyro-electric charge buildup on the optical faces that leads to birefringence non-uniformity and depolarization resulting in poor hold-off and premature lasing. The most common solution has been to use radioactive americium to ionize the air around the crystal and bleed off the charge, but the radioactive material requires handling and disposal procedures that can be problematic. We have developed a superior solution that is now being implemented by multiple defense system suppliers. By applying a low level thermo-chemical reduction to the LN crystal optical faces we induce a small conductivity that allows pyro-charges to dissipate. As the material gets more heavily treated, the capacity to dissipate charges improves, but the corresponding optical absorption also increases, causing insertion loss. Even though typical high gain targeting laser systems can tolerate a few percent of added loss, the thermo-chemical processing needs to be carefully optimized. We describe the results of our process optimization to minimize the insertion loss while still giving effective charge dissipation. Treatment is performed at temperatures below 500°C and a conductivity layer less than 0.5mm in depth is created that is uniform across the optical aperture. Because the conductivity is thermally activated, the charge dissipation is less effective at low temperature, and characterization needs to be performed at cold temperatures. The trade-off between optical insertion loss and potential depolarization due to low temperature operation is discussed and experimental results on the temperature dependence of the dissipation time and the optical loss are reported.

Proceedings Article | 10 February 2006 Paper

Periodically poled vapor transport equilibrated lithium niobate for visible light generation

Rostislav Roussev, Roger Route, Joseph Schaar, Karel Urbanek, Martin Fejer, Dieter Jundt, Claudia Kajiyama

Proceedings Volume 6103, 610302 (2006) https://doi.org/10.1117/12.647374

KEYWORDS: Crystals, Second-harmonic generation, Lithium niobate, Doping, Visible radiation, Electrodes, Photoresist materials, Harmonic generation, Continuous wave operation, Nonlinear crystals

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Proceedings Article | 23 March 2005 Paper

Vapor transport equilibrated lithium niobate resistant to photorefractive damage

Rostislav Roussev, Roger Route, Mordechai Katz, Dieter Jundt, Claudia Kajiyama, Martin Fejer

Proceedings Volume 5710, (2005) https://doi.org/10.1117/12.592604

KEYWORDS: Crystals, Waveguides, Absorption, Doping, Lithium, Lithium niobate, Scattering, Resistance, Second-harmonic generation, Niobium

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