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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 24 — Aug. 20, 2002
  • pp: 5148–5154

Compact 50-Hz terawatt Ti:sapphire laser for x-ray and nonlinear optical spectroscopy

Guangjun Cheng, Fang Shan, Abhi Freyer, and Ting Guo  »View Author Affiliations


Applied Optics, Vol. 41, Issue 24, pp. 5148-5154 (2002)
http://dx.doi.org/10.1364/AO.41.005148


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Abstract

We report a high-repetition-rate, compact terawatt Ti:sapphire laser system. The oscillator produces an 82-MHz pulse train consisting of broad-bandwidth pulses of 0.5-nJ/pulse energy and of 9-fs pulse duration. The spectrally shaped, λ/4 regenerative amplifier supports an 80-nm bandwidth. A single 50-Hz repetition-rate pump laser pumps both the regenerative amplifier and a multiple-pass amplifier. The final output from this laser is a 50-Hz pulse train made from pulses of 53 mJ/pulse energy and of 24-fs pulse duration. For generating ultrafast x-ray pulses, 90% of the energy from the final output of a 28-mm-diameter (1/e2) beam is focused onto an ultrafast x-ray wire target. The energy conversion efficiency from optical (800-nm central wavelength) to x-ray (characteristic lines of Kα from Cu at 8 keV) pulses is estimated to be 7 × 10-5. This laser system can also generate a lower-peak-power, dual-pulse output that can excite, simultaneously and coherently, Raman modes within an adjustable bandwidth (up to 700 cm-1) and at a tunable central vibrational frequency. Preliminary results for the generation of dual-pulse output and ultrafast x rays are presented.

© 2002 Optical Society of America

OCIS Codes
(140.7090) Lasers and laser optics : Ultrafast lasers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(300.6450) Spectroscopy : Spectroscopy, Raman
(300.6560) Spectroscopy : Spectroscopy, x-ray
(320.7160) Ultrafast optics : Ultrafast technology
(350.5400) Other areas of optics : Plasmas

History
Original Manuscript: November 7, 2001
Revised Manuscript: April 19, 2002
Published: August 20, 2002

Citation
Guangjun Cheng, Fang Shan, Abhi Freyer, and Ting Guo, "Compact 50-Hz terawatt Ti:sapphire laser for x-ray and nonlinear optical spectroscopy," Appl. Opt. 41, 5148-5154 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-24-5148


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