Browsing by Author "Li, Chih-Hao"

Now showing items 1-9 of 9

    • Broadband Dispersion-Free Optical Cavities Based on Zero Group Delay Dispersion Mirror Sets 

      Chen, Li-Jin; Li, Chih-Hao; Chang, Guoqing; Benedick, Andrew J.; Philips, David F.; Walsworth, Ronald L.; Kärtner, Franz X. (Optical Society of America, 2010)
      A broadband dispersion-free optical cavity using a zero group delay dispersion (zero-GDD) mirror set is demonstrated. In general zero-GDD mirror sets consist of two or more mirrors with opposite group delay dispersion ...

    • Calibration of an Astrophysical Spectrograph Below 1 m/s Using a Laser Frequency Comb 

      Phillips, David Forrest; Glenday, Alexander G.; Li, Chih-Hao; Cramer, Claire; Furesz, Gabor; Chang, Guoqing; Benedick, Andrew J.; Chen, Li-Jin; Szentgyorgyi, Andrew H.; Walsworth, Ronald L. (Optical Society of America, 2012)
      We deployed two wavelength calibrators based on laser frequency combs (“astro-combs”) at an astronomical telescope. One astro- comb operated over a 100 nm band in the deep red (∼ 800 nm) and a second operated over a 20 nm ...

    • Conjugate Fabry–Perot Cavity Pair for Improved Astro-Comb Accuracy 

      Li, Chih-Hao; Guoqing, Chang; Glenday, Alexander G.; Langellier, Nicholas Ryan; Zibrov, Alexander S; Phillips, David Forrest; Kärtner, Franz X.; Szentgyorgyi, Andrew H.; Walsworth, Ronald L. (Optical Society of America, 2012)
      We propose a new astro-comb mode-filtering scheme composed of two Fabry–Perot cavities (coined “conjugate Fabry–Perot cavity pair”). Simulations indicate that this new filtering scheme makes the accuracy of astro-comb ...

    • HARPS-N Observes the Sun as a Star 

      Dumusque, Xavier; Glenday, Alex; Phillips, David F.; Buchschacher, Nicolas; Cameron, Andrew Collier; Cecconi, Massimo; Charbonneau, David; Cosentino, Rosario; Ghedina, Adriano; Latham, David Winslow; Li, Chih-Hao; Lodi, Marcello; Lovis, Christophe; Molinari, Emilio; Pepe, Francesco; Udry, Stéphane; Sasselov, Dimitar D.; Szentgyorgyi, Andrew H.; Walsworth, Ronald Lee (IOP Publishing, 2015)
      Radial velocity (RV) perturbations induced by stellar surface inhomogeneities including spots, plages and granules currently limit the detection of Earth-twins using Doppler spectroscopy. Such stellar noise is poorly ...

    • In-Situ Determination of Astro-Comb Calibrator Lines to Better Than 10 cm \(s^{-1}\) 

      Li, Chih-Hao; Glenday, Alexander Graham; Benedick, Andrew J.; Chang, Guoqing; Chen, Li-Jin; Cramer, Claire; Fendel, Peter; Furesz, Gabor; Kärtner, Franz X.; Korzennik, Sylvain G.; Phillips, David F.; Sasselov, Dimitar D.; Szentgyorgyi, Andrew H.; Walsworth, Ronald Lee (Optical Society of America (OSA), 2010)
      Improved wavelength calibrators for high-resolution astrophysical spectrographs will be essential for precision radial velocity (RV) detection of Earth-like exoplanets and direct observation of cosmological deceleration. ...

    • In-situ determination of astro-comb calibrator lines to better than \(\textrm{10 cm s}^{-1}\) 

      Li, Chih-Hao; Glenday, Alexander G.; Benedick, Andrew J.; Chang, Guoqing; Chen, Li-Jin; Cramer, Claire; Fendel, Peter; Furesz, Gabor; Kärtner, Franz X.; Korzennik, Sylvain G.; Phillips, David M.; Sasselov, Dimitar D.; Szentgyorgyi, Andrew H.; Walsworth, Ronald L. (Optical Society of America, 2010)
      Improved wavelength calibrators for high-resolution astrophysical spectrographs will be essential for precision radial velocity (RV) detection of Earth-like exoplanets and direct observation of cosmological deceleration. ...

    • Optimization of Filtering Schemes for Broadband Astro-Combs 

      Chang, Guoqing; Li, Chih-Hao; Phillips, David Forrest; Szentgyorgyi, Andrew H.; Walsworth, Ronald L.; Kärtner, Franz X. (Optical Society of America, 2012)
      To realize a broadband, large-line-spacing astro-comb, suitable for wavelength calibration of astrophysical spectrographs, from a narrowband, femtosecond laser frequency comb (“source-comb”), one must integrate the source-comb ...

    • Toward a Broadband Astro-comb: Effects of Nonlinear Spectral Broadening in Optical Fibers 

      Chang, Guoqing; Li, Chih-Hao; Phillips, David M.; Walsworth, Ronald L.; Kärtner, Franz X. (Optical Society of America, 2010)
      We propose and analyze a new approach to generate a broadband astrocomb by spectral broadening of a narrowband astro-comb inside a highly nonlinear optical fiber. Numerical modeling shows that cascaded four-wave-mixing ...

    • Visible Wavelength Astro-Comb 

      Benedick, Andrew J.; Chang, Guoqing; Birge, Jonathan R.; Chen, Li-Jin; Glenday, Alexander Graham; Li, Chih-Hao; Phillips, David F.; Szentgyorgyi, Andrew H.; Korzennik, Sylvain G.; Furesz, Gabor; Walsworth, Ronald Lee; Kärtner, Franz X. (Optical Society of America (OSA), 2010)
      We demonstrate a tunable laser frequency comb operating near 420 nm with mode spacing of 20-50 GHz, usable bandwidth of 15 nm and output power per line of ~20 nW. Using the TRES spectrograph at the Fred Lawrence Whipple ...