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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
Published on: October 11, 2016
Grating phase matching beyond a continuum edge
P S Westbrook1, J W Nicholson, K S Feder
1OFS Laboratories, Somerset, New Jersey 08873, USA. westbrook@ofsoptics.com
Optics Letters
|September 4, 2007
Summary
Fiber Bragg gratings enhance weak optical continuum generation. This method extends spectral regions, boosting weak signals by up to 25 dB using specific fiber resonances and pulse pumping.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Materials Science
Background:
- Optical continuum generation is crucial for spectroscopy and metrology.
- Continuum generation is typically weak in specific spectral regions.
- Fiber Bragg gratings offer wavelength-selective optical properties.
Purpose of the Study:
- To demonstrate the use of fiber Bragg gratings for enhancing weak optical continuum generation.
- To extend the spectral range of optical continua into underdeveloped regions.
- To provide a computational method for predicting grating enhancement peaks.
Main Methods:
- Highly nonlinear fibers with integrated Bragg gratings (resonances at 700, 750, 800 nm) were used.
- Ultrashort (70 fs) pulses at 1580 nm were employed for pumping.
- The continuum pulse was treated as an undepleted pump in theoretical calculations.
Main Results:
- Fiber Bragg gratings significantly enhanced continuum generation in weak spectral regions.
- Enhancement peaks reached up to 25 dB above the baseline weak continuum.
- The grating-induced phase-matching term accurately predicted the observed enhancement peaks.
Conclusions:
- Fiber Bragg gratings are effective for extending optical continua into weak spectral regions.
- The proposed computational method accurately models grating-enhanced continuum generation.
- This technique offers a novel way to control and enhance ultrashort pulse propagation and spectral broadening.
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