High stability ultra-short sources of electromagnetic radiation

Coherent light generators – Particular beam control device – Mode locking

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372 25, 372 26, H01S 3098

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active

055984258

ABSTRACT:
A source of electromagnetic radiation including an output, means for generating a drive signal derived from a regenerative feedback signal generated from a portion of said output, further characterized in that an electrical signal obtained from said portion of said output is passed through a narrow bandpass filter in generating said regenerative feedback signal, and means for modulating said electromagnetic radiation within the cavity when the modulating means is driven by said drive signal is disclosed together with a method of generating short pulse electromagnetic radiation signals including operating a electromagnetic radiation source having an output, generating a drive signal derived from a regenerative feedback signal generated from a portion of said output, further characterized in that said portion of said output is passed through a narrow bandpass filter in generating said regenerative feedback signal, and, modulating said electromagnetic radiation, said drive signal derived from a regenerative feedback signal generated from a portion of said output.

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Derickson et al., "Residual and Absolute Timing Jitter in Actively Mode-Locked Semiconductor Laser", Electronics Letters, vol. 26, No. 24, pp. 2026-2028 Nov. (1990).
Nietzke et al., "Mode Locking of a Semiconductor Laser by Self-Synchronising Optoelectronic Feedback of the Longitudinal Mode Beats", Electornics Letters, vol. 26, No. 14, pp. 1016-1018 Jul. (1990).
Derickson et al., "Self-mode-locking of a semiconductor laser using positive feedback", Appl. Phys. Lett., vol. 56, No. 1, pp. 7-9 Jan. (1990) .

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