Theory of intracavity frequency doubling in passively mode-locked femtosecond lasers

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.7130· OSTI ID:6546527

Zhang, T R; Focht, G; Williams, P E; Downer, M C ^[1]

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1. Dept. of Physics, Univ. of Texas at Austin, Austin, TX (US)

The authors construct a quantitative theoretical model of an intracavity frequency doubled and passively mode-locked laser, supported by experimental observations with a colliding pulse mode-locked femtosecond dye laser. The major findings are that for second harmonic conversion efficiencies consistent with continuing laser operations (<5 percent), 1) a stable mode-locking regime always exists, although it narrows somewhat with increasing conversion efficiency; 2) the duration of the fundamental pulses can always be preserved, even in the femtosecond time domain, by readjusting saturable gain and saturable loss parameters; 3) the energy of the fundamental pulses can also be preserved under the same conditions. Both the model and observations contrast with previous studies of actively mode-locked and synchronously mode-locked lasers containing intracavity frequency doubling crystals.

• OSTI ID: 6546527
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 24:9; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CRYSTALS
DYE LASERS
EFFICIENCY
FREQUENCY SELECTION
HARMONICS
LASER CAVITIES
LASERS
LIQUID LASERS
MATHEMATICAL MODELS
MODE LOCKING
OPERATION
OSCILLATIONS