Method and an apparatus for the synchronous mode locking of the

Details Method and an apparatus for the synchronous mode locking of the Method and an apparatus for the synchronous mode locking of the

1985-03-15

1987-01-06

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Mode locking

372 97, 372 26, 372 9, H01S 3098

Patent

active

046352643

ABSTRACT:
A method and an apparatus are described by producing optical radiation pulses with a duration of the order of picoseconds (10.sup.-12 s) and less using external mode locking of the longitudinal laser modes of a semiconductor laser element operating in an external resonator. In the method of the invention the gain modulation, needed for synchronous mode locking, of the active semiconductor laser element is effected by modulation of the electrical pumping current by way of a high-speed optoelectronic switch, that for its part is controlled by a mode locked master laser. The present method combines the advantages of synchronous optical pumping, as used in commercial mode locked dye laser systems, with the simple type of electrical pumping of commercially available semiconductor laser diodes, more especially double heterostructure laser diodes. It respresents a simple and economic alternative to synchronously pumped dye laser systems and considerably extends the spectral range within which radiation pulse may be produced with a duration of the order of picoseconds.

REFERENCES:
Spectral Characteristics of External-Cavity Controlled Semiconductor Lasers y M. W. Fleming and A. Mooradian; 1981 IEEE.
Mode Locking of Strip Buried Heterostructure(AlGa)As Lasers Using an External Cavity by J. P. van der Ziel and R. M. Mikulyak; pub. by J. Appl Phys. 51(6), Jun. 1980.
Subpicosecond Pulses from Passively Mode-Locked GaAs Buried Guide Semiconductor Lasers by J. P. van der Ziel, W. T. Tsang, R. A. Logan, R. M. Mikulyak and W. M. Augustyniak; publ. by Appl. Phys. Lett. 39(7), Oct. 1, 1981.
Direct Gain Modulation of a Semiconductor Laser by a GaAs Picosecond Optoelectronic Switch by E. O. Gobel, G. Vieth, a) J. Kuhl, and H.-U. Habermeier; pub. by Appl. Phys. Lett. 42(1), Jan. 1, 1983.
Generation of Subpicosecond Pulses from an Actively Mode Locked GaAs Laser in an External Cavity by J. P. van der Ziel, R. A. Logan, and R. M. Mikulyak: pub. by Appl. Phys. Lett. 39(11), Dec. 1, 1981.
Picosecond Pulse Generation by Passive Mode Locking of Diode Lasers by E. P. Ippen a) D. J. Eilenberger; pub. by Appl. Phys. Lett. 37(3), Aug. 1, 1980.
Mode Locking of an Organic Dye Laser by W. H. Glenn, M. J. Brienza, and A. J. DeMana; pub. by Appl. Phys. Lett., vol. 12, No. 2, Jan. 15, 1968.
Optically Pumped Mode-Locked InGaAsP Lasers by S. H. Groves and M. C. Plonko, R. S. Putnam, C. B. Roxlo,a) and M. M. Salour b); pub. by Appl. Phys. Lett., vol. 40, No. 8, Apr. 15, 1982.
Picosecond Pulse Generation from a Synchronously Pumped Mode-Locked Semiconductor Laser Diode by John C. AuYeung and Alan R. Johnston; pub. by Appl. Phys. Lett., vol. 40, No. 2, Jan. 15, 1982.

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