2 . 2 Intra - cavity difference frequency generation in pulsed optical parametric oscillators

Observation of a cascaded process in intracavity terahertz optical parametric oscillators based on lithium niobate.

Cascaded difference frequency generation has been observed in intracavity optical parametric oscillators based on bulk lithium niobate and producing nanosecond pulses of terahertz radiation. Two idler waves are generated, namely: the primary idler wave associated with the parametric down conversion process itself; and a secondary idler wave, due to difference frequency generation. Experimental ...

Diversified pulse generation from frequency shifted feedback Tm-doped fibre lasers

Pulsed fibre lasers operating in the eye-safe 2 μm spectral region have numerous potential applications in areas such as remote sensing, medicine, mid-infrared frequency conversion, and free-space communication. Here, for the first time, we demonstrate versatile 2 μm ps-ns pulses generation from Tm-based fibre lasers based on frequency shifted feedback and provide a comprehensive report of thei...

High-power broadband femtosecond near- and mid-infrared sources based on optical parametric oscillators and difference frequency generation at 40 MHz repetition rates

Mid-Infrared Difference Frequency-Generation with Synchronized Fiber Lasers

We present results on high-average power difference frequency generation of pulsed Yb/Er fiber systems to the mid-IR (6.2 W at 3.35 μm), and use focused Gaussian beam theory to validate our experimental results. OCIS codes: (190.4970) Parametric oscillators and amplifiers; (140.3070) Infrared and far-infrared lasers; (140.3510) Lasers, fiber

High-efficiency, high-power difference-frequency generation of 0.9-1.5 μm light in BBO

An efficient method for generation of high energy pulsed ir light between 0.9 and 1.5 ltm is described. The technique uses difference frequency mixing of pulsed, visible dye and Nd:YAG laser light in a 10 mm long BBO crystal. Quantum efficiencies of up to 23% and ir pulse energies up to 4.5 mJ are demonstrated. The low shot-to-shot fluctuations of difference frequency generation in BBO make thi...