Ultrashort optical pulse signals generation

Details Ultrashort optical pulse signals generation Ultrashort optical pulse signals generation

1992-10-23

1993-11-23

Bovernick, Rodney B.

Coherent light generators

Particular beam control device

Mode locking

372 23, 372 70, 372 97, H01S 3098

Patent

active

052651096

ABSTRACT:
Apparatus is disclosed for generating two streams of optical pulse signals having less than 100 femtoseconds of jitter. A Ti:sapphire laser that is self mode locked by using self focusing in the gain medium and a weak HITCI intercavity dye jet for starting generates a first stream of substantially 100 femtosecond pulses. This first stream of optical pulses is split into two parts, one of which is used as a desired stream of optical pulses and the other of which is used to pump an HITCI dye laser synchronously to generate a second desired stream of optical pulses. The pulses of the second stream from the dye laser have durations of about 140 femtoseconds and less than 100 femtoseconds of jitter relative to the pulses of the first stream. Stated differently, if pulses of about 100 femtoseconds duration are used to pump a gain medium which exhibits strong gain saturation, then the pulses which are generated will have less than 100 femtoseconds of jitter relative to the pump pulses provided that the generated pulses have durations which are greater than the pump pulses. In the embodiment disclosed, the laser which is pumped with the first stream of pulses is a HITCI dye laser having a small positive dispersion in its cavity to ensure that the pulses generated by the dye laser pulses remain slightly larger than the pump pulses.

REFERENCES:
patent: 4815080 (1989-03-01), Chesney et al.
"60-fsec Pulse Generation From a Self-Mode-Locked Ti:Sapphire Laser" D. E. Spense, et al., Optics Letters, vol. 16, No. 1 Jan. 1, 1991 pp. 42-44.
"Femtosecond Pulses From a Continuously Self-Starting Passively Mode-Locked Ti:Sapphire Laser" U. Keller, et al., Optics Letter. vol. 16, No. 13, Jul. 1, 1991 pp. 1022-1024.
"Generation of 50-fsec pulses from a Pulse-Compressed, CW, Passively Mode-Locked Ti:Sapphire Laser", N. Sarukura et al. Optics Letters, vol. 16, No. 3, Feb. 1, 1991 pp. 153-155.
"Broadly tunable High Repetition Rate Femtosecond Optical Parametric Oscillator" D. Edelstein et al., Appl. Phys. Lett 54(18), May 1, 1989 pp. 1728-1730.
"Continuous-Wave Mode-Locked and Dispersion-Compensated Femtosecond Optical Parametric Oscillator", E. S. Wachman et al., Optics Letters, vol. 15, No. 2, Jan. 15, 1990, pp. 136-138.
"Tunable Femtosecond Dye Laser Synchronously Pumped by the Compressed Second Harmonic of Nd:YAG" A. M. Johnson and W. M. Simpson, J. Opt. Soc. Am. B, vol. 2, No. 4 Apr. 1985 pp. 619-625.
"Stabilization of a Femtosecond Dye Laser Synchronously Pumped by a Frequency-Doubled Mode-Locked YAG Laser", J. Chesnoy and L. Fini, Optics Letters, vol. 11, No. 10, Oct. 1986, pp. 635-637.
C-P. Huang, et al., Optics Letters, vol. 17, No. 2, Jan. 15, 1992 pp. 139-141.

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