کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1663784 | 1008734 | 2016 | 5 صفحه PDF | دانلود رایگان |
• Second-harmonic generation (SHG) in thermally-poled silica fiber was studied.
• Quasi-phase-matching (QPM) was performed by periodic depoling with UV exposure.
• Exposures with an excimer laser and a mercury lamp were compared.
• Optimization of the QPM was performed by stretch of the fiber.
• Increase in the SH power by a factor of up to 4 was obtained by fiber stretch.
Optimization of the quasi-phase-matching (QPM) for second-harmonic generation in thermally-poled twin-hole fiber was performed by stretch of the fiber. The periodic structure for QPM was fabricated by erasure of the second-order nonlinearity by exposure with ultraviolet light through a mask. Exposures with a KrF excimer laser and a low-pressure mercury lamp were compared. The fundamental-wave source was a Q-switched Nd:YAG laser. The dependence of the second-harmonic output on the strain induced by the stretch of the fiber was measured. For periodic depoling by excimer-laser exposure, the second-harmonic power increased by a factor of up to 4 by the stretch. For periodic depoling by mercury-lamp exposure, the maximum increase by the stretch was also by a factor of up to 4. The fiber stretch was effective for fine tuning of QPM for poled fibers.
Journal: Thin Solid Films - Volume 614, Part B, 1 September 2016, Pages 47–51