title: Simple method for the temporal characterization of amplified spontaneous emission in femtosecond terawatt Ti:sapphire lasers.
abstract: We have analyzed the temporal characteristics of amplified spontaneous emission (ASE) in femtosecond terawatt Ti:sapphire lasers by using a simple method based on fast photodiodes. Instead of measuring ASE directly with fast photodiodes, we created a narrow gap in the spectrum of seed pulses and, after amplification, detected the pure ASE signal through the gap by using a fast photodiode covered with a bandpass filter with high transmission at the gap. Because the detected ASE signal was completely separated from amplified main pulses, preceding and even trailing ASEs could be characterized quantitatively in a single-shot measurement. We believe that our method is a good alternative or a complement to conventional methods for ASE measurements.
authors: Quantum Optics Center, Korea Atomic Energy Research Institute, Daejeon, South Korea. yhcha@kaeri.re.kr
authors: Yong-Ho
authors: YH
authors: Cha
authors: Yong-Woo
authors: YW
authors: Lee
authors: Sung Mo
authors: SM
authors: Nam
authors: Jae Min
authors: JM
authors: Han
authors: Yong Joo
authors: YJ
authors: Rhee
authors: Byung Duk
authors: BD
authors: Yoo
authors: Byoung Chul
authors: BC
authors: Lee
authors: Young Uk
authors: YU
authors: Jeong