Abstract A photoacoustic spectrometer has been developed to measure in situ light absorption by aerosol. The measured quantity is the sound pressure produced in an acoustic resonator caused by light absorption. The current lower detection limit for light absorption is 0.4 Mm which corresponds to an elemental carbon mass density of ≈ 40 ng/m assuming an efficiency for light absorption of 10 m/g....

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-...

An amplified cholesteric liquid crystal (CLC) laser performance is demonstrated by utilizing a binary-dye mixture (with 62 wt% DCM and 38 wt% PM597) as the active medium and an external stable resonator. The measured results show that the laser efficiency is enhanced as compared to the highest efficiency of each individual dye. Furthermore, using such an active CLC in an external stable resonat...

In this Letter we use resolved sideband laser cooling to cool a mesoscopic mechanical resonator to near its quantum ground state (phonon occupancy 2.6±0.2), and observe the motional sidebands generated on a second probe laser. Asymmetry in the sideband amplitudes provides a direct measure of the displacement noise power associated with quantum zero-point fluctuations of the nanomechanical reson...

California Institute of Technology, Pasadena, California 91125. Received 28 June 1975. A simple expression for the beam divergence from a laser oscillating in a high order Gaussian mode can be derived from the properties of the mathematical expressions for these modes.' For simplicity, we first consider a symmetric confocal resonator of spacing b, which contains a laser medium of diameter 2a, a...

In order to study the interacting quantum gases of lithium atoms, we have developed a novel dipole trap based on the resonant enhancement of a far detuned standing wave in an optical resonator. Light from an ultrastable 2-W Nd:YAG laser is coupled into the resonator and enhanced 130-fold, thus creating a trap depth of ~1 mK for the lithium atoms. It enables us to trap ~10-10 laser-cooled atoms ...

We report a new technique for the rapid fabrication of microstripe cylindrical and toroidal mirrors with a high ratio (>10) of the two principal radii of curvature (RoC(1)/RoC(2)), and demonstrate their effectiveness as mode-selecting resonator mirrors for high-power planar waveguide lasers. In this process, the larger radius of curvature (RoC(1)) is determined by the planar or cylindrical shap...

The developed iteration algorithm for simulation of lasers with an open resonator was employed in the study of transverse mode formation. The simulations of an axially symmetrical resonator rely on an analytical description of radiation diffraction from a narrow ring. Reflection of an incident wave with a specified amplitude-phase distribution from the mirror is calculated by the Green-function...

The parameters of the near-confocal Fabry-Pérot resonator at the wavelengths of trap light (851 nm) and probe light (780 nm) are summarized in table A1. Both trap laser and probe laser are locked to the resonator via Pound-Drever-Hall locks of 1 MHz loop bandwidth. Another feedback loop stabilizes the resonator frequency to an atomic transition in Rb. The atoms are loaded into the standing-wave...

The output beam quality of multi transverse modes of laser, are relatively poor. In order to obtain better beam quality, one may use an aperture inside the laser resonator. In this case, various transverse modes can be selected. We have selected various transverse modes both by simulation and doing experiment. By inserting a circular aperture inside the diode end-pumped Nd:YAG pulsed laser reso...