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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Stabilized laser for spectroscopy on trapped calcium ions
 Čížek, Martin ; Pham, Minh Tuan ; Lešundák, Adam ; Hucl, Václav ; Řeřucha, Šimon ; Hrabina, Jan ; Lazar, Josef ; Číp, Ondřej
The paper focuses on the ongoing development of clock laser assembly operating at a wavelength of 729 nm, which will be used for 40Ca+ calcium spectroscopy. As a primary source of coherent radiation, a diode laser with an external resonator operating at a wavelength of 729 nm is used. The width of the spectral line of the free-running laser is approx. 300 kHz. The laser is tunable by a piezoelectric actuator in the range of 10 GHz with a maximum bandwidth of 2 kHz. Fast fine-tuning in hundreds of MHz is possible by modulating the pump current of the laser diode with 50MHz bandwidth. The optical frequency of the laser is locked by means of electronic control loops on a resonator with a finesse better than 300 000 with a mode spectral width of approx. 8 kHz. The cavity of the resonator is made of ULE material and placed in a thermally stabilized vacuum chamber. The entire optical assembly is mounted on an active anti-vibration pad in a wooden box plated with acoustic and thermal isolation. The tuning of the primary laser to the resonator mode is detected by the Pound-Drever-Hall technique.
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Simulation of Fiber Bragg Gratings for Semiconductor Laser Stabilization
 Helán, R. ; Mikel, Břetislav
Fiber Bragg gratings (FBGs) are one of the most enveloping optical devices in telecommunications and sensor systems. Work is aimed to design of FBGs with utilization especially in sensor systems and laser interferometry for semiconductor laser stabilization at wavelength about 760nm. FBG is sampled and described as sandwich structure of dielectric media layers. Then the T-matrix method is applied to calculation of spectral properties of the grating. This method provides design of arbitrary gratings widely used in many optical systems, such as band filters, in-fiber sensors or fiber grating lasers and amplifiers for their unique properties.
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