| 11. | The vertical grey line represents an unknown optical frequency.
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| 12. | A major obstacle to developing an optical clock is the difficulty of directly measuring optical frequencies.
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| 13. | His work contributed to the emergence of swept-source optical coherence tomography ( optical frequency domain imaging ).
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| 14. | Where h is the Planck constant, ? the optical frequency, ? the size of the velocity of light.
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| 15. | The frequency comb now serves as the basis for optical frequency measurements in large numbers of laboratories worldwide.
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| 16. | At optical frequencies metal mirrors have low reflectivity ( 94 % ) when used on materials like GaAs.
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| 17. | At optical frequencies, in semiconductors the dielectric constant exhibits structure related to the band structure of the solid.
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| 18. | Similar coherence lengths can be reached with optical frequency combs due to the narrow linewidth of each tooth.
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| 19. | Dual polarisation interferometry is also used to measure the complex refractive index for very thin films at optical frequencies.
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| 20. | The relaxed optical frequency stabilization requirements allow the associated costs of CWDM to approach those of non-WDM optical components.
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