Abstract: Systems and methods to stabilize a laser frequency include a birefringent resonator that introduces an arbitrary phase difference between two polarization components of the laser beam, a polarizing beam splitter to separate the two polarization components after the birefringent resonator, and a differential detector to monitor the separated two polarizations, based on which an error signal can be produced to control a servo to adjust the laser frequency or resonator resonance frequency accordingly. The birefringent resonator can comprise a fiber ring, a whispering gallery mode (WGM) resonator, or any other birefringent ring resonator. A servo can be included in the systems and methods to lock the laser frequency to the resonant frequency of the birefringent resonator or to lock the resonator resonant frequency to the laser frequency. One or more polarization controllers can also be employed to adjust the polarization state of the laser beam.

Abstract: Systems and methods to stabilize a laser frequency include a birefringent resonator that introduces an arbitrary phase difference between two polarization components of the laser beam, a polarizing beam splitter to separate the two polarization components after the birefringent resonator, and a differential detector to monitor the separated two polarizations, based on which an error signal can be produced to control a servo to adjust the laser frequency or resonator resonance frequency accordingly. The birefringent resonator can comprise a fiber ring, a whispering gallery mode (WGM) resonator, or any other birefringent ring resonator. A servo can be included in the systems and methods to lock the laser frequency to the resonant frequency of the birefringent resonator or to lock the resonator resonant frequency to the laser frequency. One or more polarization controllers can also be employed to adjust the polarization state of the laser beam.

Abstract: A rinse-added fabric treatment composition having a rinse aid increases the rinse capacity of an aqueous rinse bath solution for removing laundry residue from laundered fabrics. When properly diluted in water, the rinse-added fabric treatment composition provides a rinse bath solution having a rinsing capacity of greater than 1. In addition, a rinse-added fabric treatment composition reduces the surfactant residue on a fabric, and includes from about 0.05% to about 10% of a residue reduction agent, a suds suppresser, and the balance adjunct ingredients. The residue reduction agent is selected from a cationic residue reduction agent, a zwitterionic residue reduction agent, and a combination thereof. Moreover, methods for reducing surfactant residue on fabric and a method for reducing the amount of water used in a rinsing step of a laundry process are included. A kit for improving the rinsing capacity of water includes a rinse-added fabric treatment composition and an instruction set.