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	Laser standard for precise length and time metrology Pravdová, Lenka ; Hrabina, Jan ; Čížek, Martin ; Číp, Ondřej We present the development and the achieved parameters of the telecom C-band optical frequency laser standard. Compact and robust laser system based on ultra-narrow linewidth fiber laser achieves relative frequency stabilities from 9e-13/1s down to 8e-14/256s levels and can serve as stable frequency source for applications of dissipation of precise time and frequency, wavelength calibrations in optical telecommunication or laser interferometry measurement systems. Detailed record
	Iodine-frequency stabilized Telecom laser diode at 515 nm Philippe, Ch. ; Du Burck, F. ; Acef, O. ; Hrabina, Jan ; Pham, Minh Tuan We have developed an original frequency tripling process based on a compact Telecom laser diode operating around 1542 nm associated to PPLN nonlinear crystals. The optical setup is fully fibred and delivers up to 300 mW at 514 nm. This output generated green radiation is used to probe a molecular vapor inserted in a 20 cm long iodine cell developed by ISI lab. The frequency stability of that reference laser is daily controlled within few parts of 10-16 over 1000 s of integration time. Allan variance associated to the frequency stability of our iodine stabilized telecom laser diode decreases with a slope of 1.4x10-13 with a minimum value of 3x10-14 around 40 s. Detailed record
	Laser standards for interferometry and stable frequencies distribution Hrabina, Jan Optical frequency references - absorption cells - represent an unique tool for frequency stabilization of the laser sources. Their spectral properies define overall quality of the stabilized laser, so these properties must be precisely controlled and verified. One of the most used absorption media in the visible spectral range is molecular iodine. It offers wide and reach spectra of very narrow and strong transitions so many types of laser standards can be realized on base of this media. Testing of final properties of iodine absorption cells is traditionaly based on two methods - laser induced fluorescence method (LIF) and evaluation of absolute frequency shifts of the iodine stabilized laser (beatnote measurement). Unfortunately both of these methods have few limitations and disadvantages - in case of high-quality cells the LIF method reaches its resolution limits, the beatnote method needs quite complicated optical setup. We present a novel approach for the iodine cells quality evaluation based on measurement of hyperfine transition linewidths - the impurities in absorption media cause line broadening of the transitions. Pilot measurement shows that presented method achieves a very good sensitivity to the iodine purity and together with a need of relatively simple setup can be considered as a novel method for absorption cells quality verification. Detailed record

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