Monolithic carrier-envelope phase-stabilization scheme

Abstract

A new scheme for stabilizing the carrier-envelope (CE) phase of a few-cycle laser pulse train is demonstrated. Self-phase modulation and difference-frequency generation in a single periodically poled lithium niobate crystal that transmits the main laser beam allows CE phase locking directly in the usable output. The monolithic scheme obviates the need for splitting off a fraction of the laser output for CE phase control, coupling into microstructured fiber, and separation and recombination of spectral components. As a consequence, the output yields 6-fs, 800-nm pulses with an unprecedented degree of short- and long-term reproducibility of the electric field waveform.

Phase-stable, multi-µJ femtosecond pulses from a repetition-rate tunable Ti:Sa-oscillator-seeded Yb-fiber amplifier

“…Important contributions to the success of these oscillators are their large optical bandwidth, leading to the direct generation of few-cycle pulses, and the excellent phase stability achievable with feed-back [4] and feed-forward stabilization schemes [5]. However, a major drawback of Ti:Sa amplifiers is the high thermal absorption and thermal lensing in the gain medium, which restricts the average powers to a few tens of Watts even with cryogenic cooling [6], thus limiting high-pulse-energy operation to repetition rates significantly lower than 1 MHz.…”

Measurement and Control of Carrier-Envelope Phase in Femtosecond Ti:sapphire Laser

“…Moreover, excessive dispersion and phase noise of the nonlinear interferometer prevents the broadband spectrum laser from being compressed to few-cycle pulses with low time-jitter. Recently, a novel CEO frequency measurement technique based on the nonlinear difference frequency generation(DFG) and self-phase modulation (SPM) of the few-cycle pulses focused in the monolithic highly nonlinear periodically poled magnesium-oxidedoped lithium niobate (PP-MgO:LN) crystal or other nonlinear crystals is provided [25]. In regions of spectral overlap, a CEO beat frequency between the fundamental wave extended by SPM and the DF wave was observed.…”

Carrier-Envelope Phase Stablization of Grating Based High-Power Ultrafast Laser

“…The oscillator operates at 78 MHz repetition rate with a 200mWoutput power. The carrier-envelope offset frequency (f CEO ) of the oscillator is stabilized using the monolithic carrier-envelope phase-stabilization scheme (Fuji et al, 2005). With the assistance of the temperature feedback control, f CEO of this oscillator can be locked about 12 hours on a daily basis .…”