Rb-87-stabilized 375-MHz Yb:fiber femtosecond frequency comb

We report a fully stabilized 1030-nm Yb-fiber frequency comb operating at a pulse repetition frequency of 375 MHz. The comb spacing was referenced to a Rb-stabilized microwave synthesizer and the comb offset was stabilized by generating a super-continuum containing a coherent component at 780.2 nm which was heterodyned with a 87Rb-stabilized external cavity diode laser to produce a radio-frequency beat used to actuate the carrier-envelope offset frequency of the Yb-fiber laser. The two-sample frequency deviation of the locked comb was 235 kHz for an averaging time of 50 seconds, and the comb remained locked for over 60 minutes with a root mean squared deviation of 236 kHz

The Way Cyber Physical Systems Will Revolutionise Maintenance

30th Conference on Condition Monitoring and Diagnostic Engineering Management (COMADEM 2017). 10 to 13, Jul, 2017. Preston, United Kingdom.The way maintenance is carried out is altering rapidly. The introduction of Cyber Physical Systems (CPS) and cloud technologies are providing new technological possibilities that change dramatically the way it is possible to follow production machinery and the necessity to carry out maintenance. In the near future, the number of machines that can be followed from remoteness will explode. At the same time, it will be conceivable to carry out local diagnosis and prognosis that support the adaptation of Condition Based Maintenance (CBM) i.e. financial optimisation can drive the decision whether a machine needs maintenance or not. Further to this, the cloud technology allows to accumulate relevant data from numerous sources that can be used for further improvement of the maintenance practices. The paper goes through the new technologies that have been mentioned above and how they can be benefitted from in practise.info:eu-repo/semantics/publishedVersio

Saturation of absorption and gain in a quantum dot diode with continuous-wave driving

We have observed saturation of absorption and gain in ensembles of InAs/GaAs self-assembled quantum dots at room temperature with continuous-wave driving in the 1.24-1.28 mu m wavelength range. The saturation intensity was found to be I-sat=(1.4-4.5) X 10(9) W/m(2) in absorption and I-sat =(0.2-3.8)X10(9) W/m(2) in gain, depending on the detuning. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3524824]</p

Saturation of absorption and gain in a quantum dot diode with continuous-wave driving

We have observed saturation of absorption and gain in ensembles of InAs/GaAs self-assembled quantum dots at room temperature with continuous-wave driving in the 1.24-1.28 mu m wavelength range. The saturation intensity was found to be I-sat=(1.4-4.5) X 10(9) W/m(2) in absorption and I-sat =(0.2-3.8)X10(9) W/m(2) in gain, depending on the detuning. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3524824

Towards optical attosecond pulses: broadband phase coherence between an ultrafast laser and OPO using lock-tozero CEO stabilization

The carrier-envelope-offset frequencies of the pump, signal, idler and related sum-frequency mixing pulses have been locked to 0 Hz in a 20-fs-Ti:sapphire-pumped optical parametric oscillator, satisfying a critical prerequisite for optical attosecond pulse synthesis