Publications by authors named "Wanguo Liang"
Article Synopsis
- The paper discusses a technique for generating a 355 nm ultraviolet laser using two specially designed crystals, which allows for efficient conversion of laser light.
- In the first crystal, a 1064 nm laser is used to create 532 nm light, while the second crystal combines this with leftover 1064 nm light to produce the desired UV laser.
- The resulting UV laser achieves a maximum output of 20 mW, a high pulse rate, and boasts superior peak power compared to earlier methods, highlighting its potential for practical applications.
Yellow-orange lights, valuable in photodynamic therapies, spectroscopy, and optogenetics, are limited by the narrow bandwidth and bulky setup via the conventional Raman or optical parametric oscillation processes. Moreover, flatness in the broad-band spectrum is also important for the aforementioned applications with extended functions. In this paper, by carefully designing grating-periods of a step-chirped PPMgLN ridge waveguide for sum frequency generation (SFG), we report a compact broad-band yellow-orange light with bandwidth of 5.
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- The study showcases the use of MgO-doped periodically poled lithium niobate (MgO:PPLN) for generating multiple wavelengths through simultaneous second-harmonic generation (SHG), sum frequency generation (SFG), and Raman conversion.
- The setup utilizes a single MgO:PPLN crystal with a uniform poling period of 10.2 µm, allowing for effective phase matching and achieving significant output powers of blue (487 nm) and orange (598 nm) light from a 974 nm laser diode pump.
- Unexpected additional wavelengths were also detected, illustrating the potential of this technology for diverse applications in fields like biomedicine and fundamental scientific research.
We demonstrate bandwidth broadening in cascaded MgO-doped periodically poled lithium niobate (MgO:PPLN) crystals (Λ=10.3 μm) using the temperature-gradient technique. Up to 2.
View Article and Find Full Text PDFWe report on electro-optic beam deflection using an annealed proton exchange waveguide in lithium niobate (LN) with microstructured serrated array electrodes. Due to the electro-optic effect of the LN material, the experimental results show that the beam deflection and modulation of the LN waveguide can be realized with relatively low voltages. The total length of the serrated prism array electrodes structure is ∼5 mm.
View Article and Find Full Text PDFWe report, for what is the first time to our knowledge, widely tunable mid-IR light generation over a range of greater than 1000 nm in the 4 microm region by employing a single quasi-phase-matched periodically poled niobate waveguide at room temperature. The waveguide we used was fabricated by annealed proton exchange based on periodically poled lithium niobate. A peak conversion efficiency of 10%/W and a linewidth as small as 37 MHz were achieved.
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