Title :
Determination of the spectrally resolved gain profile of HeSe+ laser lines from the beat frequency spectrum
Author :
Reich, Norbert ; Mentel, Juergen ; Schmidt, Eberhard ; Gekat, Frank
Author_Institution :
Allgemeine Elektrotech. und Elektrooptik, Ruhr-Univ., Bochum, Germany
fDate :
3/1/1991 12:00:00 AM
Abstract :
Several laser lines are selected from the multiline spectrum of a CW HeSe+ laser by an intracavity birefringent filter. The different axial modes of a laser line move across the gain profile because of statistical variations of the resonator length. The laser modes are recorded as beat frequencies in the GHz region by a fast photodiode and a spectrum analyzer. Variable losses are inserted into the resonator by a pair of Brewster plates. From the vanishing of the axial modes with increasing losses spectrally resolved, gain profiles are determined. The measured Doppler profiles correspond to a selenium ion temperature of 1500±100 K. A population density difference of the order of 109 cm-3 is estimated from the unsaturated gain of the 522 nm line
Keywords :
gas lasers; helium; laser modes; laser transitions; selenium; 522 nm; Brewster plates; Doppler profiles; Se+ ion temperature; axial modes; beat frequency spectrum; continuous wave HeSe+ laser; fast photodiode; intracavity birefringent filter; laser modes; losses; multiline spectrum; population density difference; resonator length; spectrally resolved gain profile; spectrum analyzer; statistical variations; unsaturated gain; Birefringence; Density measurement; Frequency; Gain measurement; Insertion loss; Laser modes; Photodiodes; Resonator filters; Spectral analysis; Temperature;
Journal_Title :
Quantum Electronics, IEEE Journal of
