Interferometric multichip VECSEL
Nechay, Kostiantyn (2016)
Diplomityö
Nechay, Kostiantyn
2016
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2016100724878
https://urn.fi/URN:NBN:fi-fe2016100724878
Tiivistelmä
Lasers with narrow optical spectrum linewidth, tunable operational wavelength and multiwatt output powers are highly demanded and have a lot of fields to be applied at. This work is focused on a passive intracavity frequency mode selection technique of a laser light. Frequency mode selection is implemented by means of Michelson-type interferometric laser design. Frequency selectivity of the multichip laser can be controlled by changing the optical cavity length. Two optically pumped semiconductor vertical external cavity surface emitting laser (OPS-VECSELs) have been coherently combined with this method for the first time.
This thesis includes detailed explanations of the design, setting up and alignment of the interferometric multichip VECSEL.
The experimental laser setup has been scrutinized and spectral, spatial and power characteristics have been presented. Frequency selection with the interferometric frequency mode suppression technique has been demonstrated. Frequency selection resulted in narrowing of the optical spectrum linewidth from 10 to 1 nm. Problematics of the interferometric laser, such as instability due to vibrations and VECSEL chip selection, have been discussed. Attempts to improve the setup, by means of placing the laser into an isolating box for decreasing the mechanical and acoustic vibrations, have been. The suggestions for the improving and optimizing of the setup have been proposed. Stable and optimized VECSEL with the narrower optical linewidth can be frequency doubled for the further numerous applications: in medical field for an activating the drugs inside a human body; in imaging field, it can be used as a source of red light; in spectroscopy field, it can be an investigative tool for high-resolution spectroscopy measurements.
This thesis includes detailed explanations of the design, setting up and alignment of the interferometric multichip VECSEL.
The experimental laser setup has been scrutinized and spectral, spatial and power characteristics have been presented. Frequency selection with the interferometric frequency mode suppression technique has been demonstrated. Frequency selection resulted in narrowing of the optical spectrum linewidth from 10 to 1 nm. Problematics of the interferometric laser, such as instability due to vibrations and VECSEL chip selection, have been discussed. Attempts to improve the setup, by means of placing the laser into an isolating box for decreasing the mechanical and acoustic vibrations, have been. The suggestions for the improving and optimizing of the setup have been proposed. Stable and optimized VECSEL with the narrower optical linewidth can be frequency doubled for the further numerous applications: in medical field for an activating the drugs inside a human body; in imaging field, it can be used as a source of red light; in spectroscopy field, it can be an investigative tool for high-resolution spectroscopy measurements.