By Topic

Two-photon absorption autocorrelation of visible to ultraviolet femtosecond laser pulses using ZnS-based photodetectors

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Sun, T. ; Dept. of Phys., Hong Kong Univ. of Sci. & Technol., Kowloon, China ; Fung, B.K.K. ; Sou, I.K. ; Wong, G.K.L.
more authors

In this letter, we demonstrated an autocorrelator based on two-photon absorption (TPA) of ZnSSe photodetectors, which is capable of measuring femtosecond laser pulses from 800 to 400 nm. This broad bandwidth autocorrelator has high sensitivity and is capable of measuring laser pulses as short as 27 fs and pulse energy of a few picojoules. These results could lead to cost-effective ultrafast autocorrelator with a single detector head to cover the whole visible to near ultraviolet spectral region. Our TPA measurement shows that the defect and impurity states below the bandgap (E/sub g/) have detrimental effect for excitation wavelengths near the bandedge, however, these states are also beneficial by extending the operation wavelengths of the detector beyond E/sub g//2. Using a ZnMgS photodetector with a larger E/sub g/ enables the autocorrelator to be more sensitive at 400 nm, and extends the responsivity further into the ultraviolet wavelengths.

Published in:

Photonics Technology Letters, IEEE  (Volume:14 ,  Issue: 1 )