Pulse-forming and line-broadening in AM mode locking of the TEA-CO/sub 2/ laser
The paper describes AM mode locking for homogeneously broadened systems, a procedure for measuring linewidths under laser conditions, and finally, experimental results for a 1-atm CO/sub 2/ laser. Working in the frequency domain, analytical solutions are given for the pulse bandwidth and pulse shape as a function of frequency detuning. A simple expression for the maximum positional shift of the mirror distance is derived. It turns out that the linewidth is inversely proportional to the maximum frequency shift and can be obtained independent of the modulation parameters and time constant of the pulse-signal detector. Applying this analysis to an amplitude-modulated CO/sub 2/ laser the pulsewidth and linewidth have been measured as a function of gas composition and modulation depth. In contrast to predictions deduced from absorption measurements under neutral conditions the striking result is that under laser-discharge conditions the linewidth increases and the pulsewidth decreases with increasing helium percentage.
- Research Organization:
- Twente Univ. of Tech., Enschede, Netherlands
- OSTI ID:
- 5375716
- Journal Information:
- IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-13:6; ISSN IEJQA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synchronous, mode-locked pumping of gas lasers
Mode locking of a He--Ne 3. 39-micron laser using strong internal phase modulation