Coherent light generators – Particular beam control device – Producing plural wavelength output
Patent
1990-12-14
1992-03-10
Sikes, William L.
Coherent light generators
Particular beam control device
Producing plural wavelength output
372 25, 372102, 372103, 372 18, 372 97, H01S 3082
Patent
active
050954873
ABSTRACT:
Ultra short (pico second and shorter) laser pulses having components of different frequency which are overlapped coherently in space and with a predetermined constant relationship in time, are generated and may be used in applications where plural spectrally separate, time-synchronized pulses are needed as in wave-length resolved spectroscopy and spectral pump probe measurements for characterization of materials. A Chirped Pulse Amplifier (CPA), such as a regenerative amplifier, which provides amplified, high intensity pulses at the output thereof which have the same spatial intensity profile, is used to process a series of chirped pulses, each with a different central frequency (the desired frequencies contained in the output pulses). Each series of chirped pulses is obtained from a single chirped pulse by spectral windowing with a mask in a dispersive expansion stage ahead of the laser amplifier. The laser amplifier amplifies the pulses and provides output pulses with like spatial and temporal profiles. A compression stage then compresses the amplified pulses. All the individual pulses of different frequency, which originated in each single chirped pulse, are compressed and thereby coherently overlapped in space and time. The compressed pulses may be used for the foregoing purposes and other purposes wherien pulses having a plurality of discrete frequency components are required.
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Chuang Yung-Ho
Meyerhofer David D.
Schmid Ansgar W.
Lukacher Martin
Morse Susan S.
Sikes William L.
The University of Rochester
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