Speckle patterns have been widely employed as a method for precisely determining the wavelength of monochromatic light. In order to achieve higher resolution, variety optical diffusing waveguides have...

Optical pumping on the 2 $$^3$$ S–2 P transition (1083 nm) of metastable He or $$^4$$ atoms is used for fundamental science and applications. We report its combination with an optical probe P–3 S (706.5 in a ladder-type double resonance scheme, CW single-frequency pump diode lasers. Theoretical expectations level structure absorption spectra were computed both isotopes. Narrow Doppler-free line...

We present our evaluation of a compact laser system made of a 795 nm VCSEL locked to the Rubidium absorption line of a micro-fabricated absorption cell. The spectrum of the VCSEL was characterised, including its RIN, FM noise and line-width. We optimised the signal-to-noise ratio and determined the frequency shifts versus the cell temperature and the incident optical power. The frequency stabil...

The middle- and upper- atmosphere wind field are important parameters that characterize the upper-atmosphere environment, respectively. detection of great significance in civil military field. Laser heterodyne spectroscopy technology is a passive remote sensing with high spectral resolution sensitivity, has developed rapidly recent years. laser spectrometer takes as its core, due to small size,...

A chirp-minimized, nanosecond-pulsed system has been developed to generate tunable coherent ultraviolet light at ∼212.5 nm by fourth-harmonic conversion of output from an amplified, injection-seeded optical parametric oscillator (OPO). Our CHAPS (coherent heterodyneassisted pulsed spectroscopy) method is used to characterize the frequency stability and optical bandwidth of the system’s output r...

A prerequisite for laser cooling a molecular anion, which has not been achieved so far, is the precise knowledge of relevant transition frequencies in scheme. To determine these we present versatile method that uses one pump and photodetachment light beam. We apply this approach to C$_{2}^{-}$ study transitions between electronic ground state second excited their respective vibrational levels, ...

We report the development of a differential absorption lidar instrument (DIAL) designed and built specifically for the measurement of anthropogenic greenhouse gases in the atmosphere. The DIAL is integrated into a commercial astronomical telescope to provide high-quality receiver optics and enable automated scanning for three-dimensional lidar acquisition. The instrument is portable and can be ...

We describe a compact laser wavelength measuring instrument based on a small diffraction grating and a consumer-grade webcam. With just 1 pW of optical power, the instrument achieves absolute accuracy of 0.7 pm, sufficient to resolve individual hyperfine transitions of the rubidium absorption spectrum. Unlike interferometric wavemeters, the instrument clearly reveals multimode laser operation,...

Following a number of initial experiments using tunable diode laser selective excitation of lithium isotopes, published in the 1998-2003 period, there has been renewed and increased activity in the field. Here, a brief review of the selective laser excitation of Li isotopes is given. Emphasis is on the spectroscopy and requirements for laser isotope separation in Li. Also, the recent literature...