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Idesta Quantum Electronics

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Kim J.,KAIST | Jung K.,KAIST | Lim J.,KAIST | Chen L.-J.,Idesta Quantum Electronics | And 4 more authors.
FEL 2013: Proceedings of the 35th International Free-Electron Laser Conference | Year: 2013

We present our recent progress in remote RF synchronization using an optical way at PAL. A 79.33- MHz, low-jitter fiber laser is used as an optical master oscillator (OMO), which is locked to the 2.856-GHz RF master oscillator (RMO) using a balanced opticalmicrowave phase detector (BOM-PD). The locked optical pulse train is then transferred via a timing-stabilized 610- m long optical fiber link. The output is locked to the 2.856 GHz voltage controlled oscillator (VCO) using the second BOM-PD, which results in remote synchronization between the RMO and the VCO. We measured the long-term phase drift between the input optical pulse train and the remote RF signals using an outof- loop BOM-PD, which results in 2.7 fs (rms) drift maintained over 7 hours. Copyright © 2013 CC-BY-3.0 and by the respective authors.


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.


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.


Chang G.,German Electron Synchrotron | Chang G.,Massachusetts Institute of Technology | Li C.-H.,Harvard - Smithsonian Center for Astrophysics | Glenday A.,Harvard - Smithsonian Center for Astrophysics | And 14 more authors.
Optics InfoBase Conference Papers | Year: 2013

We describe the development of a broadband astro-comb providing wavelength coverage of 500 - 620 nm, which is deployed as a wavelength calibration source for the HARPS-N spectrograph to detect and characterize long-period exoplanets. © 2013 Optical Society of America.


Li H.,Stanford University | Li H.,SLAC | Chen L.-J.,Idesta Quantum Electronics | Cheng H.P.H.,Idesta Quantum Electronics | And 11 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.


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 University | Li H.,SLAC | Chen L.-J.,Idesta Quantum Electronics | Cheng H.P.H.,Idesta Quantum Electronics | And 11 more authors.
CLEO: Science and Innovations, CLEO-SI 2015 | Year: 2015

We present remote two-color optical-to-optical synchronization between a Ti:sapphire and Er-doped fiber laser through 360 m single-mode fiber with 3.3 fs rms jitter over 24 hours [1]. © OSA 2015.


Li H.,Stanford University | Li H.,SLAC | Chen L.-J.,Idesta Quantum Electronics | Cheng H.P.H.,Idesta Quantum Electronics | And 11 more authors.
FEL 2013: Proceedings of the 35th International Free-Electron Laser Conference | Year: 2013

We present the design and progress of a femtosecond fiber timing distribution system for the Linac Coherent Light Source (LCLS) [1-3] at SLAC to enable the machine diagnostic at the 10 fs level. The LCLS at the SLAC is the world's first hard x-ray free-electron laser (XFEL) with unprecedented peak brightness and pulse duration [1-3]. The time-resolved optical/x-ray pumpprobe experiments at this facility open the era of exploring the ultrafast dynamics of atoms, molecules, proteins, and condensed matter [4-6]. However, the temporal resolution of current experiments is limited by the timing jitter between the optical and x-ray pulses [7, 8]. Recently, sub-25 fs root mean squared (rms) jitter is achieved from an x-ray/optical cross-correlator at the LCLS [9], and external seeding is expected to reduce the intrinsic timing jitter [10, 11], which would enable full synchronization of the optical and x-ray pulses with sub- 10 fs precision. For such a technique, tight synchronization between seed and pump lasers needs to be implemented [12-16]. Preliminary test results of the major components for a 4 link system will be presented. Currently, the system is geared towards diagnostics to study the various sources of jitter at the LCLS. Copyright © 2013 CC-BY-3.0 and by the respective authors.


Cihan C.,Koç University | Beyatli E.,Koç University | Canbaz F.,Koç 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.


Glenday A.G.,Harvard - Smithsonian Center for Astrophysics | Li C.-H.,Harvard - Smithsonian Center for Astrophysics | Langellier N.,Harvard University | Chang G.,Massachusetts Institute of Technology | And 11 more authors.
Optica | Year: 2015

Searches for Earth-like exoplanets using the periodic Doppler shift of stellar absorption lines require 10 cm/s precision in the measurement of stellar radial velocity (RV) over timescales of years. Current techniques have led to the discovery of short-period exoplanets that induce RV wobbles as small as ≈1 m/s on their parent stars. It has been suggested that order-of-magnitude improved RV precision may be achievable using an astro-comb, a laser frequency comb optimized for astrophysical spectrograph wavelength calibration. Here we report the development of a broadband visible-wavelength astro-comb and its operation with the HARPS-N spectrograph at the Telescopio Nazionale Galileo in the Canary Islands. This green astrocomb has >7000 narrow (<1 MHz) spectral lines spaced by 16 GHz with relatively uniform line power from 500 to 620 nm. The line frequencies are locked to GPS, enabling us to realize HARPS-N wavelength calibration with RV measurement precision and stability <10 cm/s. © 2015 Optical Society of America.

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