Kim Kyung-Jo, Kim Jun-Whee, Oh Min-Cheol, Noh Young-Ouk, Lee Hyung-Jong
School of Electrical Engineering, Pusan National University, Pusan (Busan), 609-735, Republic of Korea.
Opt Express. 2010 Apr 12;18(8):8392-9. doi: 10.1364/OE.18.008392.
A flexible polymeric Bragg reflector is fabricated for the purpose of demonstrating widely tunable lasers with a compact simple structure. The external feedback of the Bragg reflected light into a superluminescent laser diode produces the lasing of a certain resonance wavelength. The highly elastic polymer device enables the direct tuning of the Bragg wavelength by controlling the imposed strain and provides a much wider tuning range than silica fiber Bragg gratings or thermo-optic tuned polymer devices. Both compressive and tensile strains are applied within the range from -36000 microepsilon to 35000 microepsilon, so as to accomplish the continuous tuning of the Bragg reflection wavelength over a range of up to 100 nm. The external feedback laser with the tunable Bragg reflector exhibits a repetitive wavelength tuning range of 80 nm with a side mode suppression ratio of 35 dB.
为了演示具有紧凑简单结构的宽可调谐激光器，制造了一种柔性聚合物布拉格反射器。布拉格反射光反馈到超发光激光二极管中产生特定共振波长的激光。这种高弹性聚合物器件通过控制施加的应变实现布拉格波长的直接调谐，并且提供了比石英光纤布拉格光栅或热光调谐聚合物器件宽得多的调谐范围。在从-36000微应变到35000微应变的范围内施加压缩应变和拉伸应变，以便在高达100nm的范围内实现布拉格反射波长的连续调谐。具有可调谐布拉格反射器的外反馈激光器表现出80nm的重复波长调谐范围，边模抑制比为35dB。
