Development of a Ultra-wideband Optical Sweep Generator by Using Optical Mixing of Semiconductor Lasers

制备了一种用于二次谐波产生的有机非线性光波导。通过将YAG激光入射到波导中来观察二次谐波。为了制作用于光学参量振荡器的二维有机DFB波导，生长了宽为25 mm × 50 mm的单晶薄膜。为了实现1.56 μ m和0.78 μ m激光器之间的光学相位锁定，利用二次谐波和铷谱线构建了光频链，并验证了其工作状态。为了提高光锁相的精度，研制了宽达134 MHz的宽带锁相环，使相位误差方差减小到0. 02弧度^[2]。此外，为了用作这些系统的主光源，1.56 μ m和0.83 μ m激光的光谱线宽分别减小到250 Hz和7 Hz。为了放大这些激光器的功率，尝试了将这些激光器注入锁定到多模高功率激光器中。实验结果表明，边模抑制率和功率集中率分别高达30 dB和99%，可实现700 THz范围内的精确扫频。

An organic nonlinear optical wave-guide was fabricated for second harmonic generation. The second harmonic wave was observed by incidenting a YAG laser light into the wave-guide. To fabricate a two dimensional organic DFB wave-guide for optical parametric oscillator, a single crystal film as wide as 25mm x 50mm, was grown. Two dimensional DFB was also fabricated on the glass surface.To realize an optical phase locking between the 1.56um and 0.78um lasers, optical frequency link using a second harmonics and rubidium spectral line was constructed and its operation was confirmed. To improve the accuracy of the Optical phase locking, wideband phase locking loop, as wide as 134MHz, was made by which the phase error variance was reduced to 0.02 radian^2. Furthermore, in order to use as primary light sources for these system, spectral linewidths of 1.56um and 0.83um lasers were reduced to 250Hz and 7Hz, respectively. To amplify the powers of these laser, injection locking of these lasers to multi-mode high power laser was tried. As a result, side mode suppression ratio and power concentration ratio as high as 30dB and 99%, respectively, were achieved.By these results, it was confirmed that an accurate frequency sweep with 700THz range, was confirmed.