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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 1: Laser Systems – Optical Methods (joint session K/Q)

K 1.2: Vortrag

Montag, 10. März 2025, 11:30–11:45, HS XI ITW

Electronically tunable fiber-feedback optical parametric oscillator with intracavity Echelle grating stretcher — •Florent Kadriu, Michael Harteker, Tobias Steinle, and Harald Giessen — University of Stuttgart 4th Physics Institute

Tunable light sources in the near-IR are often limited by tuning speed, stability, and reproducibility due to the physical movement of optics. Fiber-feedback optical parametric oscillators (FF-OPOs) offer broad tuning in the IR with high stability. Thus, ideally static optics are required for ultrafast and reproducible tuning. We present a gain-switched diode-based FF-OPO using an intracavity echelle grating stretcher for temporal-dispersion wavelength tuning. This approach enables four distinct tuning ranges corresponding to four grating orders, achieving a theoretical tuning rate of 500 kHz, a narrow linewidth below 1 nm, and 2 pm wavelength reproducibility. This concept can be transferred to other grating types and spectral ranges and is ideal for applications in infrared narrowband AM/FM spectroscopy.

Keywords: Grating stretcher; FFOPO; Electronically tunable; Echelle grating