초록 ▼

Various embodiments described herein relate to a laser source for producing a pulsed laser beam comprising a plurality of ultrashort optical pulses having a variable repetition rate. In one embodiment, the laser source comprises a fiber oscillator, which outputs optical pulses and a pulse stretcher

Various embodiments described herein relate to a laser source for producing a pulsed laser beam comprising a plurality of ultrashort optical pulses having a variable repetition rate. In one embodiment, the laser source comprises a fiber oscillator, which outputs optical pulses and a pulse stretcher disposed to receive the optical pulses. The optical pulses have an optical pulse width. The pulse stretcher has dispersion that increases the optical pulse width yielding stretched optical pulses. The laser source further comprises a fiber amplifier disposed to receive the stretched optical pulses. The fiber optical amplifier has gain so as to amplify the stretched optical pulses. The laser source includes an automatically adjustable grating compressor having dispersion that reduces the optical pulse width. The grating compressor automatically adjusts this dispersion for different repetition rates.

대표청구항 ▼

What is claimed is: 1. A laser source for producing a pulsed laser beam comprising a plurality of ultrashort optical pulses having a variable repetition rate, said laser source comprising:a fiber oscillator that outputs optical pulses having an optical pulse width;a pulse stretcher disposed to recei

What is claimed is: 1. A laser source for producing a pulsed laser beam comprising a plurality of ultrashort optical pulses having a variable repetition rate, said laser source comprising:a fiber oscillator that outputs optical pulses having an optical pulse width;a pulse stretcher disposed to receive said optical pulses, said pulse stretcher having dispersion that increases said optical pulse width yielding stretched optical pulses;a fiber amplifier disposed to receive said stretched optical pulses, said fiber optical amplifier having gain so as to amplify said stretched optical pulses, wherein said fiber amplifier subjects said pulses to a level of self-phase modulation that affects the optical pulse width of said amplified pulses as a function of pulse repetition rate;an automatically adjustable grating compressor comprising at least one translatable bulk optical element, said compressor having dispersion that reduces the optical pulse width of said amplified pulses, said dispersion of said grating compressor being adjustable, said grating compressor automatically adjusting said dispersion for different repetition rates; anda feedback system that includes an optical detector that senses said optical pulse width of said amplified pulses or said repetition rate and a controller that adjusts said grating compressor based on said sensed optical pulse width or said sensed repetition rate.