Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 4: Laserentwicklung (Festkörperlaser I)

Q 4.7: Vortrag

Montag, 10. März 2008, 15:30–15:45, 3H

Frequency stabilized pulsed dual rod Nd:YAG ring-oscillator following a Pound-Drever-Hall method — •Martin Ostermeyer and Alexander Sträßer — Universität Potsdam, Am neuen Palais 10, 14469 Potsdam

An injection seeded pulsed Nd:YAG ring laser oscillator has been setup for single frequency operation. A monolith ring-laser (NPRO) serves as seed laser. It has been frequency stabilized following a radio-frequency-sideband scheme. This dual rod oscillator emits pulses with 23 ns duration and 20 mJ energy. The beam quality is almost diffraction limited (M2 = 1.2). The frequency stability was characterized with a heterodyne method to 1.0 MHz (rms) [1]. This oscillator will serve as front-end for a series of Lidar devices for spectrally sensitive measurements. The ring resonator comes up with a less critical isolation from the seed laser, a wider stability range, and a wider separation of the longitudinal modes compared to a linear standing wave resonator. The Pound-Drever-Hall-method (PDH) supplies an unambiguous error signal for the length control of the cavity. However there are time dependent length and phase changes in the resonator due to time dependent pumping and Q-switching. They pose a challenge for reaching a fast and accurate length control of the resonator.