Abstract

We report a simple and compact design of a dispersion compensated mode-locked Yb:fiber oscillator based on a nonlinear amplifying loop mirror (NALM). The fully polarization maintaining (PM) fiber integrated laser features a chirped fiber Bragg grating (CFBG) for dispersion compensation and a fiber integrated compact non-reciprocal phase bias device, which is alignment-free. The main design parameters were determined by numerically simulating the pulse evolution in the oscillator and by analyzing their impact on the laser performance. Experimentally, we achieved an 88 fs compressed pulse duration with sub-fs timing jitter at 54 MHz repetition rate and 51 mW of output power with $5.5\times 10^{-5}$ [20 Hz, 1 MHz] integrated relative intensity noise (RIN). Furthermore, we demonstrate tight phase-locking of the laser's carrier-envelope offset frequency ( $f_{\text{ceo}}$ ) to a stable radio frequency (RF) reference and of one frequency comb tooth to a stable optical reference at 291 THz.

Flexible all-PM NALM Yb:fiber laser design for frequency comb applications: operation regimes and their noise properties

Aline S. Mayer, Wilfrid Grosinger, Jakob Fellinger, Georg Winkler, Lukas W. Perner, Stefan Droste, Sarper H. Salman, Chen Li, Christoph M. Heyl, Ingmar Hartl, and Oliver H. Heckl
Opt. Express 28(13) 18946-18968 (2020)

Stable noise-like pulse generation from a NALM-based all-PM Tm-doped fiber laser

Bo Ren, Can Li, Tao Wang, Kun Guo, and Pu Zhou
Opt. Express 30(15) 26464-26471 (2022)

Few-femtosecond timing jitter from a picosecond all-polarization-maintaining Yb-fiber laser

Wei Chen, Youjian Song, Kwangyun Jung, Minglie Hu, Chingyue Wang, and Jungwon Kim
Opt. Express 24(2) 1347-1357 (2016)

Comparison of two low-noise CEO frequency stabilization methods for an all-PM Yb:fiber NALM oscillator

Sarper Salman, Yuxuan Ma, Kutan Gürel, Stéphane Schilt, Chen Li, Philip Pfäfflein, Christoph Mahnke, Jakob Fellinger, Stefan Droste, Aline S. Mayer, Oliver H. Heckl, Thomas Südmeyer, Christoph M. Heyl, and Ingmar Hartl
OSA Continuum 4(6) 1889-1896 (2021)

Sub-femtosecond timing jitter, all-fiber, CNT-mode-locked Er-laser at telecom wavelength

Chur Kim, Sangho Bae, Khanh Kieu, and Jungwon Kim
Opt. Express 21(22) 26533-26541 (2013)