AI Article Synopsis
- Researchers have developed a new technique to trigger modelocking (ML) emission in frequency-shifted feedback (FSF) lasers using an intracavity modulator.
- The method involves applying a second radio frequency tone at the cavity's free spectral range (FSR), which creates both frequency shifts and synchronized amplitude modulation (AM) with each cavity round trip.
- This technique allows for ML emission at various frequency shifts and lower initiation thresholds than traditional FSF laser ML, with simulations suggesting that the Kerr effect is key to pulse buildup, while AM aids in starting the ML process.
Article Abstract
We report an experimental technique to trigger modelocking (ML) emission in frequency-shifted feedback (FSF) lasers. These lasers feature an intracavity modulator driven by a radio frequency tone, which shifts the light spectrum every cavity round trip. The technique consists of the drive of the modulator with a second tone at the cavity free spectral range (FSR) frequency. So, in addition to the frequency shift, a weak amplitude modulation (AM) appears synchronous with the cavity round trip time. The approach is successful as FSF cavities support chirped modes evenly spaced by the FSR, whose AM coupling produces convenient seed pulses for the ML onset. This results in ML emission at arbitrary frequency shifts and initiation thresholds lower than in standard, spontaneous FSF laser ML. Simulations indicate that the role of AM is to trigger the formation of ML pulses, but the primary mechanism of pulse buildup is the Kerr effect. The technique opens a new, to the best of our knowledge, practical route to initiate ML emission in FSF lasers.
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| http://dx.doi.org/10.1364/OL.515163 | DOI Listing |
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View Article and Find Full Text PDFArticle Synopsis
- Researchers have developed a new technique to trigger modelocking (ML) emission in frequency-shifted feedback (FSF) lasers using an intracavity modulator.
- The method involves applying a second radio frequency tone at the cavity's free spectral range (FSR), which creates both frequency shifts and synchronized amplitude modulation (AM) with each cavity round trip.
- This technique allows for ML emission at various frequency shifts and lower initiation thresholds than traditional FSF laser ML, with simulations suggesting that the Kerr effect is key to pulse buildup, while AM aids in starting the ML process.
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