Title :
Optical frequency upconversion of tunable nanosecond laser radiation in collagen
Author :
Theodossiou, T. ; Politopoulos, K. ; Rapti, G. ; Yova, D. ; Georgiou, E. ; Hovhannisyan, V.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Greece
Abstract :
Summary form only given. Collagen is an abundant constituent of several types of biological tissue. It has been previously shown that collagen-rich tissue pumped by short 1064 nm laser pulses emits 532 nm radiation. In the present work, this phenomenon of optical frequency-doubling is further investigated in pure type I collagen over a broad spectral range of pump wavelengths in the nanosecond pulse regime, obtained from a tunable Ti:sapphire gain-switched laser at fluences on the order of several tens of MW/cm/sup 2/.
Keywords :
Q-switching; biological tissues; high-speed optical techniques; laser applications in medicine; laser tuning; optical harmonic generation; optical pumping; proteins; 1064 nm; 532 nm; biological tissue; collagen; collagen-rich tissue; nanosecond pulse regime; optical frequency upconversion; optical frequency-doubling; pump wavelengths; pure type I collagen; short 1064 nm laser pulses; tunable Ti:sapphire gain-switched laser; tunable nanosecond laser radiation; Biological tissues; Biomedical optical imaging; Frequency; Laser excitation; Nanobioscience; Optical pulses; Optical pumping; Pump lasers; Stimulated emission; Tunable circuits and devices;
Conference_Titel :
Lasers and Electro-Optics Europe, 2000. Conference Digest. 2000 Conference on
Conference_Location :
Nice
Print_ISBN :
0-7803-6319-1
DOI :
10.1109/CLEOE.2000.909848
