Coherent light generators – Particular beam control device – Control of pulse characteristics
Patent
1988-08-01
1991-03-26
Gonzalez, Frank
Coherent light generators
Particular beam control device
Control of pulse characteristics
372 32, H01S 310
Patent
active
050035452
ABSTRACT:
The invention relates to the generation of lased light having a broadband spectral content within a frequency-shifted feedback cavity containing a gain medium, a frequency-shifting device and one or more mirrors so arranged that they receive the multiple-frequency output issuing from the gain medium and repeatedly circulate it around the cavity through both the gain medium and frequency-shifter thereby either increasing or decreasing the frequency of the circulating beam by an incremental amount without any Fabry-Perot frequency discrimination, mode production or chirping during each pass. Each frequency-shifted signal is combined with those preceding it to output a modeless beam of broad spectral output. By selectively mismatching the cavity length and the frequency shift per pass, a continuous wave output is assured; whereas, conversely, by phasing the circulating frequency-shifted beams within limits amounting to several percent plus or minus the optimum, a pulsed output results. The inclusion of one or more frequency-selective devices within the cavity substantially enhances the pulse production in the pulsed version of the FSFC.
REFERENCES:
patent: 4606031 (1986-08-01), Beene et al.
patent: 4700150 (1987-10-01), Hall et al.
Colorado School of Mines
Gonzalez Frank
Hanes Richard W.
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