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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 15 — Jul. 23, 2007
  • pp: 9584–9599

Transform-limited picosecond pulse shaping based on temporal coherence synthesization

Yongwoo Park, Mohammad H. Asghari, Tae-Jung Ahn, and José Azaña  »View Author Affiliations


Optics Express, Vol. 15, Issue 15, pp. 9584-9599 (2007)
http://dx.doi.org/10.1364/OE.15.009584


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Abstract

A simple and efficient optical pulse re-shaper based on the concept of temporal coherence synthesization is proposed and analyzed in detail. Specifically, we demonstrate that an arbitrary chirp-free (transform-limited) optical pulse waveform can be synthesized from a given transform-limited Gaussian-like input optical pulse by coherently superposing a set of properly delayed replicas of this input pulse, e.g. using a conventional multi-arm interferometer. A practical implementation of this general concept based on the use of conventional concatenated two-arm interferometers is also suggested and demonstrated. This specific implementation allows the synthesis of any desired temporally-symmetric optical waveform with time features only limited by the input pulse bandwidth. A general optimization algorithm has been developed and applied for designing the system specifications (number of interferometers and relative time delays in these interferometers) that are required to achieve a desired optical pulse re-shaping operation. The required tolerances in this system have been also estimated and confirmed by numerical simulations. The proposed technique has been experimentally demonstrated by reshaping an ≈1-ps Gaussian-like optical pulse into various temporal shapes of practical interest, i.e. picosecond transform-limited flat-top, parabolic and triangular pulses (all centered at a wavelength of ≈ 1550nm), using a simple two-stage interferometer setup. A remarkable synthesis accuracy and high energetic efficiency have been achieved for all these pulse re-shaping operations.

© 2007 Optical Society of America

OCIS Codes
(070.2590) Fourier optics and signal processing : ABCD transforms
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(120.2440) Instrumentation, measurement, and metrology : Filters
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(320.5540) Ultrafast optics : Pulse shaping

ToC Category:
Ultrafast Optics

History
Original Manuscript: May 21, 2007
Revised Manuscript: July 13, 2007
Manuscript Accepted: July 13, 2007
Published: July 18, 2007

Citation
Yongwoo Park, Mohammad H. Asghari, Tae-Jung Ahn, and José Azaña, "Transform-limited picosecond pulse shaping based on temporal coherence synthesization," Opt. Express 15, 9584-9599 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-15-9584


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References

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