Coherent light generators – Particular active media – Semiconductor
Patent
1990-08-17
1991-07-16
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 19, 372 92, 372 96, 372 99, H01S 305
Patent
active
050330543
ABSTRACT:
A laser having a phase conjugating reflector positioned with a resonant cavity of a laser configuration capable of multimode operation. The resonant cavity or other means associated with the laser configuration selects the preferred mode at threshold. The phase conjugating material builds up reflectivity as the light intensity is increased above threshold power levels to maintain the selected mode to high power levels. One embodiment has an external Talbot cavity with a first mirror in a Talbot plane of a multi-emitter laser array and with the phase conjugating material at a sub-Talbot plane. Another embodiment has an external GRIN lens cavity with a far field apertured stripe mirror for threshold mode selection. The phase conjugator is placed at a high light intensity position within the cavity such as adjacent to the stripe mirror or adjacent to the laser array. The laser source may be a linear laser diode array or a 2-D surface emitting laser array. An additionl embodiment uses a diode-array-pumped solid state laser medium together with a phase conjugator between the cavity mirrors.
REFERENCES:
patent: 4233571 (1980-11-01), Wang et al.
patent: 4633476 (1986-12-01), Scifres et al.
patent: 4972427 (1990-11-01), Streiffer et al.
C. H. Chang-Hasnain et al., "High Power with High Efficiency in a Narrow Single-Lobed Beam from a Diode Laser Array in an External Cavity", Applied Physics Letters 50 (21), May 25, 1987, pp. 1465-1467.
J. R. Leger et al., "Coherent Addition of AlGaAs Lasers Using Microlenses and Diffractive Coupling", Applied Physics Letters 52 (21), May 23, 1988, pp. 1771-1773.
C. Chang-Hasnain et al., "Diffraction-Limited Emission from a Diode Laser Array in an Apertured Graded-Index Lens External Cavity", Applied Physics Letters 49 (11), Sep. 15, 1986, pp. 614-616.
M. Taneya et al., "Diffraction-Limited Single Beam Emitted from an Array Diode with a Phase Shifter", and J. Berger et al., Narrow Far-Field Beam from a Y-Junction Laser Array Using a Customized Spatial Filter in an External Cavity, both in Conference on Lasers and Electro-Optics, Apr. 26-May 1987, p. 316.
A. Golubentsev, "Theory of Phase Locking of an Array of Lasers", Sov. Phys. JETP 66 (4), Oct. 1987, pp. 676-682.
J. Winthrop et al., "Theory of Fresnel Images. I. Plane Periodic Objects in Monochromatic Light", J. Optical Societyof America, vol. 55, No. 4, Apr. 1965, pp. 373-381.
V. Shkunov et al., "Optical Phase Conjugation", Scientific American, Dec. 1985, pp. 54-59, 150.
D. Pepper, "Applications of Optical Phase Conjugation", Scientific American, Jan. 1986, pp. 74-83, 126, see especially pp. 77-78.
Craig Richard R.
Scifres Donald R.
Waarts Robert G.
Davie James W.
Spectra Diode Laboratories, Inc.
LandOfFree
Phase conjugate laser does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase conjugate laser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase conjugate laser will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-137637