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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 13 — Jun. 25, 2007
  • pp: 8203–8211

Precise and long-term stabilization of the carrier-envelope phase of femtosecond laser pulses using an enhanced direct locking technique

Tae Jun Yu, Kyung-Han Hong, Hyung-Gyu Choi, Jae Hee Sung, Il Woo Choi, Do-Kyeong Ko, Jongmin Lee, Junwon Kim, Dong Eon Kim, and Chang Hee Nam  »View Author Affiliations

Optics Express, Vol. 15, Issue 13, pp. 8203-8211 (2007)

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We demonstrate a long-term operation with reduced phase noise in the carrier-envelope-phase (CEP) stabilization process by employing a double feedback loop and an improved signal detection in the direct locking technique [Opt. Express 13, 2969 (2005)]. A homodyne balanced detection method is employed for efficiently suppressing the dc noise in the f-2f beat signal, which is converted into the CEP noise in the direct locking loop working at around zero carrier-envelope offset frequency (fceo). In order to enhance the long-term stability, we have used the double feedback scheme that modulates both the oscillator pump power for a fast control and the intracavity-prism insertion depth for a slow and high-dynamic-range control. As a result, the in-loop phase jitter is reduced from 50 mrad of the previous result to 29 mrad, corresponding to 13 as in time scale, and the long-term stable operation is achieved for more than 12 hours.

© 2007 Optical Society of America

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:
Ultrafast Optics

Original Manuscript: April 3, 2007
Revised Manuscript: May 17, 2007
Manuscript Accepted: June 9, 2007
Published: June 15, 2007

Tae Jun Yu, Kyung-Han Hong, Hyun-Gyug Choi, Jae Hee Sung, Il Woo Choi, Do-Kyeong Ko, Jongmin Lee, Junwon Kim, Dong Eon Kim, and Chang Hee Nam, "Precise and long-term stabilization of the carrier-envelope phase of femtosecond laser pulses using an enhanced direct locking technique," Opt. Express 15, 8203-8211 (2007)

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