Apparatus for producing femtosecond and picosecond pulses from m

Details Apparatus for producing femtosecond and picosecond pulses from m Apparatus for producing femtosecond and picosecond pulses from m

1995-09-05

1997-05-06

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Mode locking

372 11, 372 12, 372 6, 372105, 372 25, 372 98, 372102, 372 27, 372 94, H01S 3098

Patent

active

056278489

ABSTRACT:
A technique for the generation of picosecond (psec) and femtosecond (fsec) pulses from modelocked double-clad fiber lasers cladding pumped with broad area diode laser arrays is disclosed. Using an erbium/ytterbium fiber oscillator, 560 fsec pulses with pulse energies up to 40 pJ are generated at a wavelength of 1560 nm. In a dispersion-compensated cavity, pulses as short as 170 fsec with pulse energies up to 50 pJ are obtained. By adding a negatively chirped fiber Bragg grating for additional intracavity dispersion control, pulse widths of 3 psec with pulse energies up to 1 nJ are obtained. A saturable absorber is used for pulse start up, whereas nonlinear polarization evolution is exploited for steady-state pulse shaping. An environmentally stable design is ensured by employing birefringent fibers and a compensation scheme for linear and nonlinear polarization drifts in the cavity.

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