Title :
Detection of ultrafast thermal transients using a chirped, super-continuum white light pulse
Author :
Richardson, C.J.K. ; Spicer, J.B. ; Huber, R.D. ; Lee, H.W.H.
Author_Institution :
Dept. of Mater. Sci. & Eng., Johns Hopkins Univ., Baltimore, MD, USA
Abstract :
Summary form only given. Ultrafast material transients are typically measured with a correlation technique that uses two ultrashort laser pulses and a delay line. The technique presented in this work encodes the temporal information onto the spectral components of a chirped and temporally stretched, super-continuum probe pulse. This preserves the information of the entire material transient onto a single probe pulse. The approach generalizes and improves on the single-shot, narrowband, chirped detection technique used by Z. Jiang and C. Zhang (1998). Other single shot techniques have been recently realized that separate a single probe pulse into a series of time-delayed probe pulses that are spatially separated onto a CCD device. The use of a continuous probe pulse such as the technique presented here offers several advantages including ease of configuring the time record length and temporal resolution while providing a degree of insensitivity to optical misalignment.
Keywords :
chirp modulation; high-speed optical techniques; optical pulse compression; thermoreflectance; time resolved spectroscopy; chirped supercontinuum white light pulse; chirped-pulse stretcher; normalized reflectivity change; regenerative amplifier; second harmonic generation; single probe pulse; spectral components; temporal resolution; temporally stretched pulse; time record length; ultrafast thermal transients detection; Charge coupled devices; Chirp; Delay lines; Narrowband; Optical materials; Optical pulses; Optical recording; Probes; Pulse measurements; Spatial resolution;
Conference_Titel :
Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-662-1
DOI :
10.1109/CLEO.2001.947488