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Express"],"published-print":{"date-parts":[[2026,7,27]]},"abstract":"<jats:p>We demonstrate a robust and compact all-polarization-maintaining (all-PM) fiber laser system delivering few-cycle pulses at 1560\u2005nm and its second-harmonic generation (SHG) at 780\u2005nm. The system features a simplified architecture comprising a PM seed oscillator, a PM fiber power amplifier, and a periodically poled lithium niobate (PPLN) based frequency doubling module. Benefiting from the all-PM fiber integration, the source exhibits superior environmental immunity and long-term reliability. Experimental results show that the amplified pulses at 1560\u2005nm reach a minimum duration of \u223c25.4 fs, corresponding to approximately 4.9 optical cycles, with an average power of 139\u2005mW and a pulse energy of 3.4 nJ. The radio-frequency (RF) spectrum at the fundamental repetition rate exhibits a signal-to-noise ratio of \u223c106\u2005dB, confirming a stable mode-locking state. The integrated relative intensity noise (RIN) over 10\u2005Hz-1\u2005MHz is 0.0108% at the maximum pump power, and the root-mean-square power fluctuation is 0.17% over 10\u2005h under free-running operation. Furthermore, PPLN-based second-harmonic generation produces 780-nm pulses with a deconvolved duration of \u223c55 fs. The high-fidelity temporal and noise characteristics, validated by full-field reconstruction and comprehensive relative intensity\/phase noise analysis, indicate that this robust all-PM fiber source can be a promising alternative for precision frequency metrology, nonlinear imaging, and ultrafast spectroscopy.<\/jats:p>","DOI":"10.1364\/oe.607458","type":"journal-article","created":{"date-parts":[[2026,7,6]],"date-time":"2026-07-06T08:00:06Z","timestamp":1783324806000},"page":"27243","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Robust all-PM fiber few-cycle pulse source at 1560\u2005nm and its second-harmonic generation"],"prefix":"10.1364","volume":"34","author":[{"given":"Xuefang","family":"Peng","sequence":"first","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zihan","family":"Li","sequence":"additional","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanlong","family":"Li","sequence":"additional","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wanlu","family":"Cao","sequence":"additional","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1185-6923","authenticated-orcid":true,"given":"Wei","family":"Lin","sequence":"additional","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenlong","family":"Wang","sequence":"additional","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yalong","family":"Liu","sequence":"additional","affiliation":[{"name":"Guangzhou Yangming Laser Technology Co., Ltd."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoming","family":"Wei","sequence":"additional","affiliation":[{"name":"South China University of Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,7,14]]},"reference":[{"key":"oe-34-15-27243-R1","doi-asserted-by":"publisher","first-page":"233","DOI":"10.1038\/416233a","type":"journal-article","volume":"416","author":"Udem","year":"2002","journal-title":"Nature"},{"key":"oe-34-15-27243-R2","doi-asserted-by":"publisher","first-page":"B51","DOI":"10.1364\/JOSAB.27.000B51","type":"journal-article","volume":"27","author":"Diddams","year":"2010","journal-title":"J. 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