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SMV-2022-31: He-Ne-I2 cells
Hrabina, Jan ; Holá, Miroslava ; Lazar, Josef ; Šarlejová, Tatiana ; Šlechtický, Stanislav
The contractual research was oriented towards the development of optical frequency references intended for the frequency stabilisation of ultra-compact laser sources. These optical references were based on absorption cells filled with ultra-pure absorption gases and they allow precise locking of the lasers with the methods of laser spectroscopy. The cells will serve as the references of optical frequencies in systems of primary length standards (633 nm wavelength).
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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-2014-27: Optical system for generation of stable optical frequency
Hrabina, Jan ; Číp, Ondřej ; Čížek, Martin ; Hucl, Václav
The work was oriented to design and development of a stable optical frequency laser standard based on ultra-low noise DFB laser. The laser frequency was locked to selected rotational-vibrational transition of isotopic acetylene gas by the method of linear absorption spectroscopy. The research included: design, investigation and development of narrow-linewidth DFB laser source including of development of ultra-low noise power-supply and control electronics; development of an optical setup equipped with opto-fiber output for automatic locking of the laser to selected transition of the ultra-pure acetylene gas, special custom-design absorption cell development, filled with isotopic acetylene, with optical windows equipped with custom-design antireflection coatings; development of control electronics for automatic searching of absorption lines and automatic locking of the laser frequency to this transition; development of control software.
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