M E Fermann

Publications (116)211.41 Total impact

• Article: Carrier envelope offset frequency of a doubly resonant, nondegenerate, mid-infrared GaAs optical parametric oscillator.

  Kevin F Lee, Jie Jiang, C Mohr, J Bethge, M E Fermann, Nick Leindecker, Konstantin L Vodopyanov, Peter G Schunemann, I Hartl
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  ABSTRACT: We measure the carrier envelope offset (CEO) frequency of the mid-infrared frequency comb (wavelength tunable between 3 and 6 μm) from a doubly resonant nondegenerate synchronously pumped optical parametric oscillator (SPOPO) as a function of the CEO frequency of the Tm-fiber pump laser. We show that the CEO frequency of the SPOPO signal wave is a linear function of the CEO frequency of the pump laser, with a slope determined by the signal to pump center-frequency ratio.
  Optics Letters 04/2013; 38(8):1191-3. · 3.40 Impact Factor
• Article: Frequency comb stabilization with bandwidth beyond the limit of gain lifetime by an intracavity graphene electro-optic modulator.

  C-C Lee, C Mohr, J Bethge, S Suzuki, M E Fermann, I Hartl, T R Schibli
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  ABSTRACT: Intracavity loss modulation enables offset-frequency control with bandwidths beyond what is possible by pump power modulation. To demonstrate this new method, we use a subwavelength thick graphene electro-optic modulator to stabilize the offset frequency in a Tm:fiber frequency comb at 1.95 μm wavelength. Record-low residual phase noise of 144 mrads was achieved with this new locking scheme.
  Optics Letters 08/2012; 37(15):3084-6. · 3.40 Impact Factor
• Article: Widely tunable midinfrared difference frequency generation in orientation-patterned GaAs pumped with a femtosecond Tm-fiber system.

  C R Phillips, J Jiang, C Mohr, A C Lin, C Langrock, M Snure, D Bliss, M Zhu, I Hartl, J S Harris, M E Fermann, M M Fejer
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  ABSTRACT: We demonstrate a midinfrared source tunable from 6.7 to 12.7 μm via difference frequency generation (DFG) in orientation-patterned GaAs, with 1.3 mW average output power. The input pulses are generated via Raman self-frequency shift of a femtosecond Tm-doped-fiber laser system in a fluoride fiber. We numerically model the DFG process and show good agreement between simulations and experiments. We use this numerical model to show an improved design using longer pump pulses.
  Optics Letters 07/2012; 37(14):2928-30. · 3.40 Impact Factor
• Source

  Available from: Ingmar Hartl

  Article: Full phase stabilization of a Yb:fiber femtosecond frequency comb via high-bandwidth transducers.

  C Benko, A Ruehl, M J Martin, K S E Eikema, M E Fermann, I Hartl, J Ye
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  ABSTRACT: We present full phase stabilization of an amplified Yb:fiber femtosecond frequency comb using an intracavity electro-optic modulator and an acousto-optic modulator. These transducers provide high servo bandwidths of 580 kHz and 250 kHz for f(rep) and f(ceo), producing a robust and low phase noise fiber frequency comb. The comb was self-referenced with an f-2f interferometer and phase locked to an ultrastable optical reference used for the JILA Sr optical clock at 698 nm, exhibiting 0.21 rad and 0.47 rad of integrated phase errors (over 1 mHz-1 MHz), respectively. Alternatively, the comb was locked to two optical references at 698 nm and 1064 nm, obtaining 0.43 rad and 0.14 rad of integrated phase errors, respectively.
  Optics Letters 06/2012; 37(12):2196-8. · 3.40 Impact Factor
• Article: Power optimization of XUV frequency combs for spectroscopy applications [Invited].

  D C Yost, A Cingöz, T K Allison, A Ruehl, M E Fermann, I Hartl, J Ye
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  ABSTRACT: We address technical impediments to the generation of high-photon flux XUV frequency combs through cavity-enhanced high harmonic generation. These difficulties arise from mirror damage, cavity nonlinearity, the intracavity plasma generated during the HHG process, and imperfect phase-matching. By eliminating or minimizing each of these effects we have developed a system capable of generating > 200 μW and delivering ~20 μW of average power for each spectrally separated harmonic (wavelengths ranging from 50 nm - 120 nm), to actual comb-based spectroscopy experiments.
  Optics Express 11/2011; 19(23):23483-93. · 3.59 Impact Factor
• Source

  Available from: Ingmar Hartl

  Article: Broadband phase noise suppression in a Yb-fiber frequency comb.

  A Cingöz, D C Yost, T K Allison, A Ruehl, M E Fermann, I Hartl, J Ye
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  ABSTRACT: We report a simple technique to suppress high-frequency phase noise of a Yb-based fiber optical frequency comb using an active intensity noise servo. Out-of-loop measurements of the phase noise using an optical heterodyne beat with a cw laser show suppression of phase noise by ≥7 dB out to Fourier frequencies of 100 kHz with a unity-gain crossing of ∼700 kHz. These results are enabled by the strong correlation between the intensity and phase noise of the laser. Detailed measurements of intensity and phase noise spectra, as well as transfer functions, reveal that the dominant phase and intensity noise contribution above ∼100 kHz is due to amplified spontaneous emission or other quantum noise sources.
  Optics Letters 03/2011; 36(5):743-5. · 3.40 Impact Factor
• Conference Proceeding: Yb-fiber laser frequency combs

  I. Hartl, A. Ruehl, M.E. Fermann
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  ABSTRACT: Significant progress in Yb-fiber laser based frequency combs over the last few years resulted in sub-Hz relative comb-tooth linewidths, average powers over 60 W and GHz comb spacings enabling novel applications.
  Optical Fiber Communication (OFC), collocated National Fiber Optic Engineers Conference, 2010 Conference on (OFC/NFOEC); 04/2010
• Conference Proceeding: Phase-stabilized, 1.5-W mid-infrared frequency comb

  F. Adler, K.C. Cossel, M.J. Thorpe, I. Hartl, M.E. Fermann, Jun Ye
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  ABSTRACT: We present a mid-infrared frequency comb based on a synchronously-pumped, femtosecond optical parametric oscillator. The idler (signal) is continuously tunable from 2.8-4.8 mum (1.76-1.37 mum) with a maximum average output power of 1.50 W.
  Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
• Conference Proceeding: Multi-core leakage-channel fibers with up to 26000 µm2 combined effective mode-field area

  I. Hartl, H.A. McKay, A. Marcinkevicius, L. Dong, M.E. Fermann
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  ABSTRACT: Hexagonally stacked all-glass multi-core leakage-channel fibers consisting of seven fused silica cores of up to 100 mum in diameter were fabricated. Simultaneous fundamental mode propagation in all cores and their active coherent combination was demonstrated.
  Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
• Conference Proceeding: Rapidly scanning Fourier transform spectrometer based on a GHz repetition rate Yb-fiber laser pair

  I. Hartl, A. Ruehl, R. Thapa, H.A. Mckay, B.K. Thomas, L. Fu, L. Dong, M.E. Fermann
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  ABSTRACT: We demonstrate a rapidly scanning all-fiber Fourier transform spectrometer based on a temporal scanning all-optical delay line constructed with two mode-locked 1-GHz Yb fiber lasers. An effective mirror scan rate of 7.5 km/s is achieved.
  Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
• Conference Proceeding: GHz Yb-femtosecond-fiber laser frequency comb

  I. Hartl, H.A. Mckay, R. Thapa, B.K. Thomas, L. Dong, M.E. Fermann
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  ABSTRACT: We demonstrate a Fabry-Perot cavity, passively saturable-absorber-modelocked Yb-fiber femtosecond oscillator with up to 1.04 GHz fundamental repetition rate, enabling octave spanning continuum generation and self-referenced f_CEO stabilization.
  Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
• Article: Ultrafast Fiber Laser Technology

  M.E. Fermann, I. Hartl
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  ABSTRACT: In this paper, a review of fiber laser technology as relevant for applications in ultrafast optics is given. We discuss core enabling fiber technologies, such as fiber amplifiers, all-fiber dispersion control, and highly nonlinear and large-core fibers. We concentrate on systems built around passively mode-locked fiber lasers and fiber frequency combs, which are further amplified in large-core fiber amplifiers. Our review further encompasses coherent supercontinuum generation and techniques for absolute phase control of fiber lasers and amplifiers. Applications concerned with spectral generation in the range from the vacuum UV to the terahertz range are also described.
  IEEE Journal of Selected Topics in Quantum Electronics 02/2009; · 3.78 Impact Factor
• Article: Fiber laser based hyperspectral sources

  M.E. Fermann, I. Hartl
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  ABSTRACT: Hyperspectral sources spanning from the XUV to the THz spectral range based on high power ultrafast fiber lasers are reviewed.With advances in large core and micro-structured fibers as well as absolute phase control techniques fiber systems can greatly exceed the performance of solid-state lasers systems in the hyperspectral domain. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)
  Laser Physics Letters 12/2008; 6(1):11 - 21. · 9.97 Impact Factor
• Chapter: High-power, mHz linewidth Yb:fiber optical frequency comb for high harmonic generation

  T. R. Schibli, I. Hartl, D. C. Yost, M. J. Martin, A. Marcinkevičius, M. E. Fermann, J. Ye
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  ABSTRACT: We present a fully phase-stabilized, high-power Yb:fiber frequency comb with record-low sub-mHz relative linewidths. Utilizing coherent pulse-addition inside a passive optical cavity, we achieve >3 kW average power and 100 fs pulse duration for high harmonic generation at >100 MHz pulse repetition rate. On a phosphor screen we visually observe up to the 21st harmonic generated in Xe at 136 MHz pulse repetition rate.
  12/2008: pages 840-842;
• Conference Proceeding: Self-referenced fCEO stabilization of a low noise femtosecond fiber oscillator

  I. Hartl, L.B. Fu, B.K. Thomas, L. Dong, M.E. Fermann, J. Kim, F.X. Kartner, C. Menyuk
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  ABSTRACT: We spectrally broaden a low phase noise Yb-femtosecond similariton fiber oscillator to more than an octave bandwidth. Using the f-2f self-referencing scheme we detect and stabilize its carrier envelope offset frequency.
  Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science. CLEO/QELS 2008. Conference on; 06/2008
• Source

  Available from: Ingmar Hartl

  Article: Cavity-enhanced similariton Yb-fiber laser frequency comb: 3 x 10(14) W/cm2 peak intensity at 136 MHz.

  I Hartl, T R Schibli, A Marcinkevicius, D C Yost, D D Hudson, M E Fermann, Jun Ye
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  ABSTRACT: We report on a passive cavity-enhanced Yb-fiber laser frequency comb generating 230 MW of peak power (3 kW of average power) at a 136 MHz pulse repetition rate. The intracativy peak intensity of 3 x 10(14) W/cm2 for the 95 fs pulse is sufficient to ionize noble gases, such as Xe, Kr, or Ar. The laser system is based on a mode-locked Yb-fiber similariton oscillator in conjunction with a cladding-pumped chirped-pulse fiber amplifier. After recompression, 75 fs duration pulses at a 13.1 W average power are obtained. These pulses are then coherently added inside a passive ring cavity by controlling the fiber oscillator's pulse repetition rate and carrier-envelope offset frequency. This system is well suited for studying high-field phenomena at very high pulse repetition rates.
  Optics Letters 11/2007; 32(19):2870-2. · 3.40 Impact Factor
• Conference Proceeding: Er- and Yb-doped Fiber Laser Frequency Combs and Their Applications

  I. Hartl, M.E. Fermann
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  ABSTRACT: Progress in femtosecond fiber laser based frequency combs is reviewed. Recent examples of Er-fiber frequency combs with sub-Hz relative comb tooth linewidths and Yb-frequency combs with > 10 W average power will be discussed.
  IEEE/LEOS Summer Topical Meetings, 2007 Digest of the; 08/2007
• Source

  Available from: Ingmar Hartl

  Article: Fiber-laser frequency combs with subhertz relative linewidths.

  W C Swann, J J McFerran, I Coddington, N R Newbury, I Hartl, M E Fermann, P S Westbrook, J W Nicholson, K S Feder, C Langrock, M M Fejer
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  ABSTRACT: We investigate the comb linewidths of self-referenced, fiber-laser-based frequency combs by measuring the heterodyne beat signal between two independent frequency combs that are phase locked to a common cw optical reference. We demonstrate that the optical comb lines can exhibit instrument-limited, subhertz relative linewidths across the comb spectra from 1200 to 1720 nm with a residual integrated optical phase jitter of approximately 1 rad in a 60 mHz to 500 kHz bandwidth. The projected relative pulse timing jitter is approximately 1 fs. This performance approaches that of Ti:sapphire frequency combs.
  Optics Letters 11/2006; 31(20):3046-8. · 3.40 Impact Factor
• Source

  Available from: Ingmar Hartl

  Conference Proceeding: 170MHz spaced, self-referenced fiber-frequency-comb

  I. Hartl, M.E. Fermann, C. Langrock, M.M. Fejer
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  ABSTRACT: An optically integrated frequency-comb-system based on a passively-mode locked, f_CEO-locked Er:soft-glass-fiber-laser and a PPLN-waveguide phase-sensor is demonstrated. The oscillator emits pulses with 61 nm spectral bandwidth and 170 MHz repetition frequency.
  Lasers and Electro-Optics, 2006 and 2006 Quantum Electronics and Laser Science Conference. CLEO/QELS 2006. Conference on; 06/2006
• Conference Proceeding: High power ultrafast fiber amplifiers

  L. Shah, Z. Liu, I Hartl, G.C. Cho, M E Fermann
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  ABSTRACT: We review high power and high energy ultrafast fiber amplifiers. An Yb-fiber chirped pulse amplification system employing cubicon pulses producing sub-650 fs pulses at ≫100 μJ and ≫15W is presented.
  Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference. CLEO/QELS 2006. Conference on; 06/2006