The broadband emission of Cr-doped CaYMgGeO and its applications for NIR detectors.

A phosphor-converted light-emitting diode (pc-LED) is a prime light source in smart broadband near-infrared (NIR) spectroscopy. The performance of NIR pc-LEDs crucially depends on the employed NIR luminescent materials. In this study, we synthesized a novel high-efficiency broadband NIR phosphor, CaYMgGeO:Cr (CYMG:Cr).

Non-contact thermometer behavior of (YIn)O:Yb,Er solid solution.

Oxides are physically and chemically stable. Non-contact thermometer-Yb-Er ions co-doped solid solution (YIn)O, is prepared by the regular solid method. The structural results obtained by XRD indicate that a pure phase solid solution (YIn)O has been obtained.

Improved method for damping coefficient measurement based on spectral analysis of a self-mixing signal.

In this paper, the self-mixing interference subject to weak optical feedback has been used to measure the damping vibration. By analyzing the spectrum of the signal, the damping coefficient can be extracted precisely from the nth-order Bessel functions, which are determined by the dominant harmonic order of the frequency spectrum. Theoretical derivation and signal processing are presented.