Second Harmonic Generation Using an All‐Fiber Q‐Switched Yb‐Doped Fiber Laser and MgO:c‐PPLN

Abstract

We have experimentally demonstrated an efficient all-fiber passively Q-switched Yb-doped fiber laser with Samarium doped fiber as a saturable absorber. Average output power of 3.4 W at a repetition rate of 250 kHz and a pulse width of 1.1 microseconds was obtained at a pump power of 9.0 W. By using this fiber laser system and an MgO-doped congruent periodically poled lithium niobate (MgO:c-PPLN), second harmonic generation (SHG) output at 532 nm was achieved at room temperature. The conversion efficiency is around 4.2% which agrees well with the theoretical simulation.

Full-Color Laser Displays Based on Optical Second-Harmonic Generation from the Thin Film Arrays of Selenium Nanowires

“…SHG has only subfemtosecond response times compared to fluorescence in the nanosecond range; thereby, it provides a huge opportunity for newly developed technology such as optical displays that require fast response times. 31,32 Here, we present a SHG-based full-color display as a proofof-concept demonstration for the first time, motivated by the advantageous nonlinear photon transformations described above. To develop a novel laser-projection display with microscale pixel patterns for use as full-color luminescence, Se nanowires (NWs) were synthesized as an optically functional nanomaterial and precisely positioned in a highly uniform fashion on a lithographically patterned substrate.…”

“…These unique features of the emission wavelength shift enable a selection of the excitation wavelength for upconversion-luminescence with a narrow signal bandwidth through the flexibility of frequency. SHG has only subfemtosecond response times compared to fluorescence in the nanosecond range; thereby, it provides a huge opportunity for newly developed technology such as optical displays that require fast response times. , …”