Laser-Induced Plasma Measurements Using Nd:YAG Laser and Streak Camera: Timing Considerations

We describe a streak camera system that is capable of both spatial and spectral measurements of laser-induced plasma. The system is based on a Hamamatsu C4334 streak camera and SpectraPro 2300i spectrograph. To improve the analysis of laser-induced plasma development, it is necessary to determine the timing of laser excitation in regard to the time scale on streak images. We present several methods to determine the laser signal timing on streak images—one uses the fast photodiode, and other techniques are based on the inclusion of the laser pulse directly on the streak image. A Nd:YAG laser (λ = 1064 nm, Quantel, Brilliant B) was employed as the excitation source. The problem of synchronization of the streak camera with the Q-switched Nd:YAG laser is also analyzed. A simple modification of the spectrograph enables easy switching between the spectral and spatial measurement modes

Temperature sensing using YAG:Dy single-crystal phosphor

In this paper, we analyze remote temperature sensing of using dysprosium-doped yttrium aluminum garnet (YAG:$$\hbox {Dy}^{\mathrm {3+}})$$ single crystal by means of fluorescence intensity ratio method. The single crystal was produced by the Verneuil process. Photoluminescence spectra were acquired using continuous laser diode excitation at 365 nm. The calculation of temperature sensing calibration curve was based on ratio of intensities of 458 nm and 493 nm spectral lines. It is shown that the synthesized material can be efficiently used as a thermographic phosphor up to 1273 K. Our results are compared with other recently published results using principal component analysis