Optically-induced switching between mode-locked and unmode-locked continuous wave regimes of a femtosecond Cr4+: forsterite laser

D. A. Walsh, C. E. Crombie, W. Sibbett, C. T. A. Brown, V. G. Savitski, D. Burns, S. Calvez

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The ability to control the temporal output from a femtosecond laser can enable the same laser to be used for multiple functions, for example, the laser used in an optical tweezers system could be used as a constant-intensity source to trap a biological cell and then be temporarily switched to mode-locked operation to effect photoporation. Here, we report the rapid switching of a Cr4+:forsterite laser between mode-locked and unmode-locked continuous wave (CW) regimes via the optical pumping of an intracavity SESAM element. Mode-locking of the laser was initiated by an intracavity quantum well (GaInAsN) SESAM having an anti-resonant design (Delta R similar to 0.3%, lambda(PL)similar to 1310nm) that yielded transform-limited 89fs pulses centered around 1296nm with a repetition rate of 162MHz at an average power of 64mW. Upon excitation of the SESAM with 600mW of extra-cavity power from an 808nm semiconductor diode laser, switching could be induced between the unmode-locked and mode-locked regimes. Transitions free of Q-switching or relaxation oscillations were observed with

Original languageEnglish
Title of host publicationLASER SOURCES AND APPLICATIONS
EditorsT Graf, JI Mackenzie, H Jelinkova, J Powell
Place of PublicationBELLINGHAM
PublisherSPIE
Number of pages10
Volume8433
ISBN (Print)978-0-8194-9125-1
DOIs
Publication statusPublished - 15 May 2012
EventConference on Laser Sources and Applications - Brussels, Belgium
Duration: 16 Apr 201219 Apr 2012

Publication series

NameProceedings of SPIE
PublisherSPIE-INT SOC OPTICAL ENGINEERING
Volume8433
ISSN (Print)0277-786X

Conference

ConferenceConference on Laser Sources and Applications
CountryBelgium
Period16/04/1219/04/12

Keywords

  • laser
  • mode-locking
  • regime switching
  • SESAM
  • forsterite
  • GaInAsN
  • femtosecond
  • SATURABLE BRAGG REFLECTORS
  • LOCKING
  • MICROSCOPY
  • BIOPSY
  • SKIN

Cite this

Walsh, D. A., Crombie, C. E., Sibbett, W., Brown, C. T. A., Savitski, V. G., Burns, D., & Calvez, S. (2012). Optically-induced switching between mode-locked and unmode-locked continuous wave regimes of a femtosecond Cr4+: forsterite laser. In T. Graf, JI. Mackenzie, H. Jelinkova, & J. Powell (Eds.), LASER SOURCES AND APPLICATIONS (Vol. 8433). (Proceedings of SPIE; Vol. 8433). SPIE. https://doi.org/10.1117/12.922340