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Li H.,Stanford University | Li H.,SLAC | Chen L.-J.,Idesta Quantum Electronics | Cheng H.P.H.,Idesta Quantum Electronics | And 9 more authors.
2013 Conference on Lasers and Electro-Optics, CLEO 2013 | Year: 2013

We present the design and progress towards implementation of a femtosecond fiber timing distribution system for the Linac Coherent Light Source at SLAC enabling machine diagnostic at the 10 fs level. © 2013 The Optical Society.


Cihan C.,Koc University | Beyatli E.,Koc University | Canbaz F.,Koc University | Chen L.-J.,Massachusetts Institute of Technology | And 8 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2015

We present a detailed investigation of Kerr-lens mode-locking in diode-pumped Cr:LiSAF lasers employing gain-matched output couplers (GMOCs). Single-mode diodes (660 nm, 130 mW) and tapered diodes (685 nm, 1 W) were investigated as diode pump sources. We have shown that, by reducing the gain-filtering effect, GMOC enhances the effective self-amplitude modulation depth and provides a significant improvement in both efficiency and robustness of KLM operation. From the single-mode diode pumped system, 13 fs pulses with an average power of 25 mW and a peak power 25 kW have been generated at an incident pump power of only 120 mW (21% optical-to-optical conversion efficiency). The tapered diode pumped Cr:LiSAF oscillator provided pulses as short as 14.5 fs with 106-mW average power and 60-kW peak power at an incident pump power of 940 mW (11% optical-to-optical conversion efficiency). A femtosecond tuning range extending from 807 to 919 nm was also realized with sub-50-fs long pulses. To our knowledge, demonstrated optical-to-optical conversion efficiencies, peak powers and fs tuning ranges are record results for Cr:LiSAF laser oscillators. The obtainable pulsewidth and fs tuning range are currently limited by the dispersion/reflectivity bandwidth of the available optics. © 1995-2012 IEEE.


Jung K.,Korea Advanced Institute of Science and Technology | Lim J.,Korea Advanced Institute of Science and Technology | Shin J.,Korea Advanced Institute of Science and Technology | Yang H.,Korea Advanced Institute of Science and Technology | And 6 more authors.
Journal of Lightwave Technology | Year: 2014

We show the remote synchronization between a mode-locked laser and a microwave source, separated by a hundreds meter- to kilometer-scale fiber link, with few-femtosecond rms timing drift maintained over several hours. In a laboratory test, the measured timing drift between a mode-locked laser and a 2.856-GHz microwave source, separated by a 610-m fiber link, is 2.7 fs rms (0.048 mrad phase drift) over 7 h. The corresponding relative instability in remote laser-microwave synchronization is 7.2 × 10-19 in 6300 s averaging time, in terms of overlapping Allan deviation. We further installed 1.15-km long fiber links in an accelerator building and measured the relative phase drift at the link outputs in a klystron gallery, which resulted in 6.6-fs and 31-fs rms timing drift maintained over 7 and 62 h, respectively. To achieve this performance, we combined a balanced optical cross-correlator (BOC)-based stabilized fiber link for remote timing transfer and an optical-microwave phase detector (OM-PD) for local optical-to-microwave synchronization. We identified the impact of power and polarization-state drift in the fiber link and amplitude-to-phase conversion in the OM-PD on the link stability. Based on this analysis, possible technical improvements enabling even higher timing precision and stability are identified. © 2012 IEEE.


Li H.,Stanford PULSE Institute | Li H.,Stanford University | Li H.,SLAC | Chen L.-J.,Idesta Quantum Electronics | And 13 more authors.
Optics Letters | Year: 2014

Using balanced detection in both the radio frequency (RF) and the optical domain, we remotely synchronize the repetition rate of a Ti:sapphire oscillator to an Er-doped fiber oscillator through a 360mlength-stabilized dispersion compensated fiber link. The drift between these two optical oscillators is 3.3 fs root mean square (rms) over 24 hours. The 68 MHz Er-doped fiber oscillator is locked to a 476 MHz local RF reference clock, and serves as a master clock to distribute 10 fs-level timing signals through stabilized fiber links. This steady remote two-color optical-to-optical synchronization is an important step toward an integrated femtosecond fiber timing distribution system for freeelectron lasers (FELs); it does not require x-ray pulses, and it makes sub-10-fs optical/x-ray pump-probe experiments feasible. © 2014 Optical Society of America.


Li C.-H.,Harvard - Smithsonian Center for Astrophysics | Glenday A.G.,Harvard - Smithsonian Center for Astrophysics | Langellier N.,Harvard University | Zibrov A.,Harvard - Smithsonian Center for Astrophysics | And 12 more authors.
CLEO: Science and Innovations, CLEO_SI 2013 | Year: 2013

We report development of an astro-comb providing >7000 lines spaced by 16 GHz from 500-620 nm. A characterization with an FTS shows it can provide sub-10 cm/s calibration accuracy of astrophysical spectrographs performing exo-Earth searches. © 2012 Optical Society of America.

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