Common-path self-referencing interferometer for carrier-envelope offset frequency stabilization with enhanced noise immunity

Abstract

A nonlinear interferometer design for stabilizing the carrier-envelope offset frequency of a Ti:sapphire frequency comb with superior immunity to air currents and acoustic noise is presented. The scheme uses a pair of Wollaston prisms for group-delay dispersion compensation, providing an all-common-path optical configuration. Out-of-loop phase noise measurements for an unshielded interferometer setup showed up to 15 dB improvement compared to a Michelson interferometer based system. Further simplification of the self-referencing scheme providing a compact single-Wollaston-prism design has been demonstrated.

Long-term maintenance of the carrier-envelope phase coherence of a femtosecond laser

“…Flicker phase noise, varying as f 1 in the PSD, can be seen for the frequency below 10 Hz in both black and red curves. Because this type of noise is related to mechanical vibrations and temperature fluctuation at the low-frequency region, it can be explained as a drift of the f-2f interferometer due to environmental effects [11,12]. Strong fluctuations of phase noise are also observed in the frequency band from 10 Hz to 800 Hz due to amplitude-to-phase noise conversion in PCF, similarly to those seen in Fig.…”

“…This method can minimize the degrade effect of interferometer alignment; however, it also adds complexity to system. Another solution is to use a common-path interferometer or a collinear selfreferencing setup [11][12][13]. This technique is clearly less sensitive to environmental variations and can minimize the interferometer setup as well.…”

“…This benefit can allow improvements in stability and in long-term CEP coherence. Hence, several successful methods have been reported improved CEP stabilization [11][12][13].…”

Absolute frequency measurement of the2S1/2–2F7/2electric octupole transition in a single ion of171Yb+with 10−15fractional uncertainty

“…The absolute frequency of the probe laser was measured using two femtosecond optical frequency combs, one based on a mode-locked Ti:sapphire laser [32,33] and one based on an erbium-doped fibre laser [34]. The two combs were used to provide a cross-check for the values determined by each single comb.…”

Chromatic dispersion and nonlinear phase noise compensation based on KLMS method

“…The transmission systems include the local oscillator lasers and EEPN while fiber nonlinearities are not taken into account [12]. The impact of NLPN can be reduced by common-path selfreferencing interferometer [13].…”