Practical approach for one mJ femtosecond fiber laser
AssigneePolarOnyx, Inc.
InventorJian Liu
Life of this patent
Estimating the term…
Abstract
A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser and stretching into a few hundreds ps-10 ns pulse by a fiber stretcher for projecting into an acoustic-optic (AO) functioning as a pulse picker for generated a modulated laser with a reduced repetition rate for projecting to a multiple stage amplifier. The multiple stage amplifier further includes a first high-energy amplifier implemented with a large mode area (LMA) fiber for amplifying the modulated laser up to a uJ level laser and a second amplifier implemented with a PCF based Yb doped fiber to further amplify the uJ level laser to a mJ level laser.
Claims21
A fiber Chirped Pulse Amplification (CPA) laser system comprising:
- a fiber mode-locking oscillator for generating a laser and stretching into a few hundreds ps-10 ns pulse by a fiber stretcher for projecting into an acoustic-optic (AO) functioning as a pulse picker for generated a modulated laser with a reduced repetition rate for projecting to a multiple stage amplifier wherein said multiple stage amplifier further includes a first high-energy amplifier implemented with a large mode area (LMA) fiber for amplifying said modulated laser up to a hundred μJ level laser and a second amplifier implemented with a PCF based Yb doped fiber to further amplify said tens or hundred μJ level laser to an output power over 10 W and an energy over 2 mJ with compressable femtosecond pulses.
A fiber Chirped Pulse Amplification (CPA) laser system comprising:
- a fiber mode-locking oscillator for generating a laser and stretching into a few hundreds ps-10 ns pulse by a fiber stretcher and projecting into an for projecting to an acoustic-optic (AO) functioning as a pulse picker for generated a modulated laser with a reduced repetition rate for projecting to a multiple stage amplifier wherein said multiple stage amplifier further includes a first high-energy amplifier implemented with a large mode area (LMA) fiber for amplifying said modulated laser up to a hundred μJ level laser and a second amplifier implemented with a PCF based Yb doped fiber to further amplify said tens or hundred μJ level laser to an output power over 10 W and an energy over 2 mJ with compressable femtosecond pulses.
- said fiber mode-locking oscillator is a mode locked femtosecond fiber laser operating at 1060 nm spectral region and with a pulse width of 100 fs;
- said acoustic-optic (AO) modulator functions as a pulse picker for reducing a repetition rate of said modulated laser from (20-100) MHz to (10-500) kHz.
- said multiple-stage amplifier further comprising a low energy fiber amplifier for projecting said modulated laser into said first high-energy amplifier at a μJ level;
- a stretching stage implemented with a fiber based dispersion management stretcher having a flat dispersion over a range of 1020 to 1090 nm by using a depressed cladding structure for stretching a pulse width of said laser and a compressor implemented with a photonics bandgap fiber (PBF) or a grating pair for dechirping said laser pulses and reducing a third order dispersion (TOD).
A method of generating a mJ (millie-Joule) level femtosecond (fs) fiber laser comprising:
- generating a laser from a fiber mode-locking oscillator for projecting to an acoustic-optic (AO) functioning as a pulse picker for generating a modulated laser with a reduced repetition rate for projecting to a multiple stage amplifier;
- and
- amplifying said modulated laser up to a mJ level laser by a first high-energy amplifier implemented with a large mode area (LMA) fiber and further amplifying said a hundred μJ level laser to an output power over 10 W and an energy over 2 mJ with femtosecond pulses through a second amplifier implemented with a PCF based Yb doped fiber.
Dependencies are inferred from the claim text.