Opt Lett. 2014 Jan 15;39(2):287-90. doi: 10.1364/OL.39.000287.
We demonstrate narrow-linewidth-stimulated Brillouin lasers at 1064 nm from ultra-high-Q silica wedge disk resonators on silicon. Fundamental Schawlow-Townes frequency noise of the laser is on the order of 0.1 Hz2/Hz. The technical noise spectrum of the on-chip Brillouin laser is close to the thermodynamic noise limit of the resonator (thermorefractive noise) and is comparable to that of ultra-narrow-linewidth Nd:YAG lasers. The relative intensity noise of the Brillouin laser also is reduced by using an intensity-stabilized pump laser. Finally, low-noise microwave synthesis up to 32 GHz is demonstrated by heterodyne of first and third Brillouin Stokes lines from a single resonator.
我们在硅片上的超高 Q 值二氧化硅楔形盘谐振器中演示了 1064nm 的窄线宽受激布里渊激光器。激光的基本肖特-汤斯频率噪声约为 0.1 Hz2/Hz。片上布里渊激光器的技术噪声谱接近谐振器的热折射噪声（thermorefractive noise）热力学噪声极限，与超窄线宽 Nd:YAG 激光器相当。通过使用强度稳定的泵浦激光器，布里渊激光器的相对强度噪声也得到了降低。最后，通过从单个谐振器的第一和第三布里渊斯托克斯线的外差，实现了低噪声微波合成，最高可达 32GHz。
