These bulk optical parameters (plus the absorption coefficient μa) were determined at the 890 nm laser excitation wavelength using the titanium sapphire laser (see below) and the approximate SHG (457 nm Argon ion line) wavelengths using a dual integrating sphere approach and angular resolved scattering measurements as previously reported[ 19].
In the past decade, the FPS has become a popular instrument for measuring atmospheric winds through the measurement of Doppler shifts of emission-line wavelength, but it is also used at low resolution, as a kind of tunable filter.
The dual-wavelength laser lines separation is ~13.6 nm with laser lines wavelength at 1540.4 and 1554 nm.
However, the use of a single SMS structure in these investigations, limits the laser lines wavelength separation and make difficult the wavelength selection and the cavity losses adjustment.
Fig. 6 Dual-wavelength laser emission as a function of the pump power, a Output laser spectrum for different pump powers, b Laser lines wavelength displacement versus pump power.
Janssen noticed that the yellow line's wavelength was slightly shorter than that of the well-known line of sodium, and he reported his result to the British astronomer Joseph Norman Lockyer, who had missed the eclipse.
It is generally more significant, however, to compare the dispersion with the mean refractive index of the material for some intermediate colour such as the sodium "D" Fraunhofer line of wavelength 5893 angstroms.
These spectra were taken using a laser line of wavelength of 240 nm as an excitation source from a PTI-Fluorescence system.
In summary, liquid atomization and subsequent laser pyrolysis were carried out using a CO2 laser tuned at its 10P20 line of wavelength 10.6 μm.
Besides, as applied field is increased, full width at half maximum (FWHM) of emitted light decreases to 56.5 nm from 62 nm, evolving into higher selective emission line in wavelength.
