Tunable Laser-Induced Voltage of Sugar for Ultrafast Ultraviolet Laser Pulse Detection

A low-cost rapid process for deep ultraviolet (UV) laser pulse detection has been proposed and experimentally realized by table sugars [such as fine white sugar (FS), granulated sugar (GS), and brown sugar (BS)]. A systematic study about laser-induced voltage (LIV) under a KrF pulsed laser irradiation was presented by tuning the applied bias (V-b), laser energy (Ein), and shunting resistance (R) parallel to the sample. Higher Ein enhanced LIV peak magnitude (Vp), whereas the rise time and full-width at half-maximum (FWHM) were negatively correlated with E-in. FS showed higher LIV than GS due to the smaller particle size of FS than that of GS. The LIV response trace consisted of three components of fast rise, slower rise, and attenuation, which fit well by the sum of the three exponential functions. Furthermore, the LIV response time was shortened significantly by reducing R. When a fixed R of 14.7 Omega was applied, the LIV trace displayed a 10%-90% rising time of similar to 12.2 ns and a 10%-90% falling time of similar to 23.5 ns. The response time was completely limited by the laser pulse duration, indicating that the waveform of the laser pulse was detected. In addition, the specific detectivity D* over V-b (D*/V-b) of FS is estimated to be 2.67 x 10(7) m(1/2) center dot J(-3/2) at lower Ein (<20 mJ), which was 38% and 84% higher than that of GS and BS. Our work provided a simple, low-cost, and fast method to detect a deep UV laser pulse with table sugar as the detector material.