An injection modelocked Ti-sapphire laser for synchronous photoinjection

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The CEBAF 4 GeV accelerator has recently begun delivering spin-polarized electrons for nuclear physics experiments. Spin-polarized electrons are emitted from a GaAs photocathode that is illuminated with pulsed laser light from a diode laser system synchronized to the injector chopping frequency (499 MHz). The present diode laser system is compact, reliable and relatively maintenance-free; however, output power is limited to less than 500 mW. In an effort to obtain higher average power and thereby prolong the effective operating lifetime of the source, they have constructed an injection modelocked Ti-sapphire laser with picosecond pulsewidths and gigahertz repetition rates. Modelocked operation is ... continued below

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3 p.

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Hovater, C. & Poelker, M. July 1, 1997.

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Description

The CEBAF 4 GeV accelerator has recently begun delivering spin-polarized electrons for nuclear physics experiments. Spin-polarized electrons are emitted from a GaAs photocathode that is illuminated with pulsed laser light from a diode laser system synchronized to the injector chopping frequency (499 MHz). The present diode laser system is compact, reliable and relatively maintenance-free; however, output power is limited to less than 500 mW. In an effort to obtain higher average power and thereby prolong the effective operating lifetime of the source, they have constructed an injection modelocked Ti-sapphire laser with picosecond pulsewidths and gigahertz repetition rates. Modelocked operation is obtained through gain modulation within the Ti-sapphire crystal as a result of injection seeding with a gain-switched diode laser. Unlike conventional modelocked lasers, the pulse repetition rate of this laser can be discretely varied by setting the seed laser repetition rate equal to multiples of the Ti-sapphire laser cavity fundamental frequency. They observe pulse repetition rates from 223 MHz (fundamental) to 1,560 MHz (seventh harmonic) with average output power of 700 mW for all repetition rates. Pulsewidths ranged from 21 to 39 ps (FWHM) under various pump laser conditions.

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3 p.

Notes

INIS; OSTI as DE97006860

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97006860
  • Report No.: DOE/ER/40150--1148
  • Report No.: JLAB-ACT--97-06;CONF-970503--164
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 505404
  • Archival Resource Key: ark:/67531/metadc692637

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 5, 2016, 8:11 p.m.

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Hovater, C. & Poelker, M. An injection modelocked Ti-sapphire laser for synchronous photoinjection, article, July 1, 1997; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc692637/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.