Advanced industrial fluorescence metrology used for qualification of high quality optical materials

Investigations on the photoluminescence spectra and its defect-related nature for the ultraviolet transmitting fluoride-containing phosphate-based glasses

“…2(a)-(d) share a common band around 380 nm, which can be assigned to the fluorine-related non-paramagnetic color (FD) centers in the phosphate glasses [23,26,29]. Meanwhile, monitoring at 505 nm, there is a weak but obvious excitation band extending from 415 to 450 nm with a peak maximum near 440 nm (Fig.…”

“…D. Ehrt et al, have done extensive work on the PL in the UV-VIS region [4] and photo-ionization of polyvalent ions in fluoride-phosphate, meta-phosphate and boron-silicate glasses [22]. Especially, A. Engel et al [23] investigated the quality control of multi-component phosphate optical glass emission spectra under excitation at 365 nm and found that the intensity level of emission spectra of the optical glasses gets a shape closer to CaF 2 crystal. Researches indicated that the emission bands have several maxima at about 435, 485, 525, 575 and 670 nm, which are closely dependent on the glass composition [23].…”

Laser Guide Star for Large Segmented-aperture Space Telescopes. I. Implications for Terrestrial Exoplanet Detection and Observatory Stability

“…4.5) both of these approaches, likely in conjunction with a dichroic or notch-blocking filters in the science channel allows separation of LGS light from the wavelengths and angles of interest. For LGS wavelengths shorter than the science wavelength, the magnitude of fluorescence from transmissive optics (Engel et al 2003), and the potential for laser induced contamination of reflecting surfaces (Wagner et al 2014) will require consideration. Fluorescence effects are dependent on material and wavelength.…”

How to Improve Quality Assurance in Fluorometry: Fluorescence-Inherent Sources of Error and Suited Fluorescence Standards

“…3. Techniques that are increasingly used for this purpose are conventional steadystate, laser-induced, and time-resolved fluorometry [68][69][70][71][72][73][74]. For instance, a standard procedure for quality control used by suppliers of optical glass is the measurement of the glass emission at an excitation wavelength of 365 nm and comparison of the integral emission in the wavelength region of 400-700 nm to that of reference samples like SF1 or SF6 available from Schott AG.…”