Browsing by Author "Yang, Shang-Da"

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Highly efficient femtosecond pulse stretching by tailoring cavity dispersion in erbium fiber lasers with an intracavity short-pass edge filter
(2011-08-15)
Chen, Nan-Kuang
;
Liu, Feng-Zhou
;
Chuang, Hsiu-Po
;
Lai, Yinchieh
;
Yang, Shang-Da
We demonstrate highly efficient pulse stretching in Er(3+)-doped femtosecond mode-locked fiber lasers by tailoring cavity dispersion using an intracavity short-pass edge filter. The cavity dispersion is preset at around zero to obtain the shortest pulsewidth. When the cutoff wavelength of the short-pass edge filter is thermo-optically tuned to overlap the constituting spectral components of mode-locked pulses, large negative waveguide dispersion is introduced by the steep cutoff slope and the total cavity dispersion is moved to normal dispersion regime to broaden the pulsewidth. The time-bandwidth product of the mode-locked pulse increases with the decreasing temperature at the optical liquid surrounding the short-pass edge filter. Pulse stretch ratio of 3.53 (623.8fs/176.8fs) can be efficiently achieved under a temperature variation of 4 degrees C. (C) 2011 Optical Society of America
Spectral phase retrieval of 8 fs optical pulses at 600nm by using a collinear autocorrelator with 300-mu m-thick lithium triborate crystals
(2011-06-01)
Hsu, Chen-Shao
;
Lee, Yu-Hsien
;
Yabushita, Atsushi
;
Kobayashi, Takayoshi
;
Yang, Shang-Da
We report on noniterative spectral phase retrieval of 1.1 nJ, 8 fs pulses at 600nm by using 300-mu m-thick lithium triborate crystals in a standard collinear autocorrelator with approximate to 2 min data acquisition time. This method is simple, sensitive, and immune to the spectral distortion and UV absorption of the linear and nonlinear optics. (C) 2011 Optical Society of America