Self-referencable frequency comb from a 170-fs, 1.5-μm solid-state laser oscillator

被引:46
作者
Stumpf, M. C. [1 ]
Pekarek, S. [1 ]
Oehler, A. E. H. [1 ]
Suedmeyer, T. [1 ]
Dudley, J. M. [2 ]
Keller, U. [1 ]
机构
[1] Swiss Fed Inst Technol, Dept Phys, Inst Quantum Elect, CH-8093 Zurich, Switzerland
[2] Univ Franche Comte, CNRS, UMR 6174, Inst FEMTO ST, F-25030 Besancon, France
来源
APPLIED PHYSICS B-LASERS AND OPTICS | 2010年 / 99卷 / 03期
关键词
SATURABLE ABSORBER MIRRORS; ENVELOPE OFFSET FREQUENCY; MODE-LOCKED LASERS; YB-GLASS-LASER; FIBER-LASER; PHOTONIC CRYSTAL; PULSE GENERATION; SUPERCONTINUUM GENERATION; SEMICONDUCTOR-LASERS; OPTICAL FREQUENCIES;
D O I
10.1007/s00340-009-3854-8
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We report measurement of the first carrier-envelope offset (CEO) frequency signal from a spectrally broadened ultrafast solid-state laser oscillator operating in the 1.5 mu m spectral region. The f-to-2f CEO frequency beat signal is 49 dB above the noise floor (100-kHz resolution bandwidth) and the free-running linewidth of 3.6 kHz is significantly better than typically obtained by ultrafast fiber laser systems. We used a SESAM mode-locked Er:Yb:glass laser generating 170-fs pulses at a 75 MHz pulse repetition rate with 110-mW average power. It is pumped by one standard telecom-grade 980-nm diode consuming less than 1.5 W of electrical power. Without any further pulse compression and amplification, a coherent octave-spanning frequency comb is generated in a polarization-maintaining highly-nonlinear fiber (PM-HNLF). The fiber length was optimized to yield a strong CEO frequency beat signal between the outer Raman soliton and the spectral peak of the dispersive wave within the supercontinuum. The polarization-maintaining property of the supercontinuum fiber was crucial; comparable octave-spanning supercontinua from two non-PM fibers showed higher intensity noise and poor coherence. A stable CEO-beat was observed even with pulse durations above 200 fs. Achieving a strong CEO frequency signal from relatively long pulses with moderate power levels substantially relaxes the demands on the driving laser, which is particularly important for novel gigahertz diode-pumped solid-state and semiconductor lasers.
引用
收藏
页码:401 / 408
页数:8
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