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Absorption cells based on HC-PCF fibers
Oulehla, Jindřich
This work is oriented towards our research in the field of splicing and ending of optical frequency references based on hollow core photonics crystal fibers (HC-PCF). This type of references is very promising optical element to replacing c assic bulky absorption cells for laser frequency stabilizat on. We prepared and present methods of splicing HC-PCF to standard telecommunication fiber by a fiber splicer. A special care was taken to optimize the splicer setting and to find and obtain a splice with minimal optical losses between HC-PCF and SMF. The manufactured fiber cell was closed at one side by connecting to SMF and second fiber end was prepared for placing into the vacuum chamber with the help of vacuum-tightened connection to be used as a optical frequency reference based on the acetylene gas for frequency stabilization of the laser standards.
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SMV-2014-02: Set of absorption cells filled with precisely defined amount of the medium
Lazar, Josef
The research was oriented to technology of optical frequency references - absorption cells - demanded for laser standards frequency stabilization. Iodine absorption cells are commonly operated in regime of saturated vapour - the pressure of gaseous state part of absorbing media is regulated by the temperature control of solid phase part concentrated in cold finger of the cell. The novel approach is based on technology where the cell is filled to precisely defined absorbing media pressure. In this case the cell can be operated in regime where only gaseous iodine is presented, so the cell does not need to be thermostatized by external cooler. We realized a set of cells filled with different pressure levels of media corresponding to saturation temperatures range from -15 to +85 degrees of Celsius. The research also included development of novel techniques for filling the cells above the standard room temperatures.
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SMV-2012-29: Absorption cell for laser interferometry
Lazar, Josef ; Hrabina, Jan
The research included investigation of spectral properties of molecular iodine absorption cell intended for ultra-precise laser interferometer referencing to primary standard of length. The cell was based on fused silica glass material which allowed us to reach ultra-pure absorption environment without negative foreign-gas distortion effects (collisional quenching, frequency stability degradation).
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