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Highly-efficient fully-fiberized mid-infrared differential frequency generation source and its application to laser spectroscopy

Krzempek K., Dudzik G., Hudzikowski A., Gluszek A., Abramski K.

Opto-Electronics Review

2017

Vol. 25, No. 4

269--274

Widely-tunable, fully-monolithic, mid-infrared (mid-IR) deference frequency generation source (DFG) is presented. By using a custom designed fiber-pigtailed periodically poled lithium niobate (PPLN) crystal module the idler beam was generated with an efficiency of 21%/W, yielding 2.6 mW of optical output power. The proposed all-fiber configuration radically simplified the optical frequency conversion setup, making it robust and easily configurable. The usefulness of the constructed source was verified by performing simultaneous wavelength modulation spectroscopy (WMS) laser trace gas detection of methane, near 2999 cm⁻¹, and ethane, near 2997 cm⁻¹, via two independently generated, tunable idler beams.

Intracavity polarization control in mode-locked Er-doped fibre lasers using liquid crystals

Nikodem M., Krzempek K., Zygadlo K., Dudzik G., Waz A., Abramski K., Komorowska K.

Opto-Electronics Review

2014

Vol. 22, No. 2

113-117

In this paper we present a novel configuration of an NPR mode-locked Er-doped laser. This new optical setup uses voltage controlled LC cells to replace standard retarders (quarter- and half-waveplates) inside the laser cavity. Using this novel, mechanical-adjustment-free setup a mode-locking was obtained with sub-500 fs pulse duration and an average power exceeding 40 mW. Presented results show that using simple LC cells, an optical layout of an NPR mode-locked laser can be greatly simplified.