Details
| Original language | English |
|---|---|
| Article number | 013506 |
| Number of pages | 12 |
| Journal | Physical Review A |
| Volume | 102 |
| Issue number | 1 |
| Publication status | Published - 7 Jul 2020 |
Abstract
Amplified spontaneous emission (ASE) causes fluctuations of pulse energy, of the optical phase and of the timing of the pulse intensity envelope in a mode-locked laser or frequency comb. Starting from the assumption of one ASE photon per longitudinal laser mode and round trip, we rederive analytic equations for the three fundamental types of quantum noise in a laser. To this end, we analyze the interference of the coherent intracavity field and a spectrally localized ASE photon as a function of wavelength and phase of the latter. Performing an integration over all wavelengths and phases and taking stochastic noise into account, we compute ASE-induced jitters for all quantities considered. Continuing this approach, we then derive an expression for the resulting carrier-envelope phase noise of the comb, for which so far only numerical estimates exist. We further compute analytical estimates for ASE-induced pulse chirp and duration variations and address the issue of resulting pulse contrast in a mode-locked laser and the resulting coherence properties. Considering three example cases, we finally compute estimates for all quantities analyzed. Taken together, our analysis provides a comprehensive view of ASE effects in a mode-locked laser, which unites numerous scattered reports across the literature.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Physical Review A, Vol. 102, No. 1, 013506, 07.07.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spontaneous emission noise in mode-locked lasers and frequency combs
AU - Liao, Ruoyu
AU - Mei, Chao
AU - Song, Youjian
AU - Demircan, Ayhan
AU - Steinmeyer, Günter
N1 - Funding Information: We gratefully acknowledge fruitful discussions with John Dudley (Université Franche-Comté), Jérôme Faist (ETH Zürich), Goëry Genty (Tampere University), Sebastian Koke (PTB Braunschweig), Rüdiger Paschotta (RP Photonics), and Markus Pollnau (University of Surrey). We further acknowledge financial support from Germany's Excellence Strategy within the Cluster Excellence PhoenixD (EXC 2122, Project ID 390833453).
PY - 2020/7/7
Y1 - 2020/7/7
N2 - Amplified spontaneous emission (ASE) causes fluctuations of pulse energy, of the optical phase and of the timing of the pulse intensity envelope in a mode-locked laser or frequency comb. Starting from the assumption of one ASE photon per longitudinal laser mode and round trip, we rederive analytic equations for the three fundamental types of quantum noise in a laser. To this end, we analyze the interference of the coherent intracavity field and a spectrally localized ASE photon as a function of wavelength and phase of the latter. Performing an integration over all wavelengths and phases and taking stochastic noise into account, we compute ASE-induced jitters for all quantities considered. Continuing this approach, we then derive an expression for the resulting carrier-envelope phase noise of the comb, for which so far only numerical estimates exist. We further compute analytical estimates for ASE-induced pulse chirp and duration variations and address the issue of resulting pulse contrast in a mode-locked laser and the resulting coherence properties. Considering three example cases, we finally compute estimates for all quantities analyzed. Taken together, our analysis provides a comprehensive view of ASE effects in a mode-locked laser, which unites numerous scattered reports across the literature.
AB - Amplified spontaneous emission (ASE) causes fluctuations of pulse energy, of the optical phase and of the timing of the pulse intensity envelope in a mode-locked laser or frequency comb. Starting from the assumption of one ASE photon per longitudinal laser mode and round trip, we rederive analytic equations for the three fundamental types of quantum noise in a laser. To this end, we analyze the interference of the coherent intracavity field and a spectrally localized ASE photon as a function of wavelength and phase of the latter. Performing an integration over all wavelengths and phases and taking stochastic noise into account, we compute ASE-induced jitters for all quantities considered. Continuing this approach, we then derive an expression for the resulting carrier-envelope phase noise of the comb, for which so far only numerical estimates exist. We further compute analytical estimates for ASE-induced pulse chirp and duration variations and address the issue of resulting pulse contrast in a mode-locked laser and the resulting coherence properties. Considering three example cases, we finally compute estimates for all quantities analyzed. Taken together, our analysis provides a comprehensive view of ASE effects in a mode-locked laser, which unites numerous scattered reports across the literature.
UR - http://www.scopus.com/inward/record.url?scp=85088708945&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.102.013506
DO - 10.1103/PhysRevA.102.013506
M3 - Article
AN - SCOPUS:85088708945
VL - 102
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 1
M1 - 013506
ER -