Research and development of tunable dye and semiconductor :
* tunable dye lasers pumped by Nitrogen Pulsed Lasers (NPL)
The group developed NPLs, working in two regimes:
- under-atmospheric pressure: pulsed emission at 337.1nm, pulse FTWHM 5ns, pulse repetition rate continuously adjustable between 0.1pps to 20pps, peak power per pulse adjustable between 150kW and 500kW;
- TEA NPL working at above atmospheric pressure and emitting laser pulses of FTWHM 0.5 ns, pick power per pulse adjustable between 100kW and 500 kW, pulse repetition rate continuously adjustable between 0.1pps and 20 pps.
Using NPL as pumping units tunable dye lasers(TDL) were studied; The TDL emitted beams had the following characteristics :
Tunability range : 220nm-290 nm; 337.1nm; 390nm-750nm
Pulse repetition rate : 0.1pps – 20pps
Peak power per pulse : in UV – 3kW – obtained by second harmonic generations (SHG) using nonlinear crystals such as ADP, KDP, DADP, DKDP, developed within the group by growing them from solutions
in VIS – 30kW – 50kW
* basic research on tunable dye lasers
- study of dye molecules to obtain tenability in the visible spectral range when pumped in UV
- study of the stimulated emission of the bio molecules such as chlorophyll A
- study of the excitation and de-excitation of the dye molecules using fluorescence and phosphorescence techniques, decay times included,
* The group developed and introduced in Romania this type of tunable lasers in universities, research institutes, enterprises.
* The developed tunable lasers were used as sources of optical radiation for basic and applied spectroscopy studies as well as for medical and biomedical applications
Tunable semiconductors lasers
Were developed based on commercially available diode lasers( in the visible and near infrared between 600nm and 950nm) by introducing them in extended optical cavities/resonators to optically contriol the emission, correlated with injection current and temperature tuning of the emitted laser beam wavelengths.
