Coherent light generators – Optical fiber laser
Patent
1997-02-11
1998-11-17
Healy, Brian
Coherent light generators
Optical fiber laser
372 21, 372102, 385 37, 385122, 385123, 385141, 359334, 359341, H01S 330, H01S 300, G02B 634
Patent
active
058387005
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
These inventions relate to the sphere of the laser technology, the fibre and integrated optics.
DESCRIPTION OF THE RELATED ART
A Raman fibre laser is known emitting wavelength .lambda.=1.48 mc and comprising a fibre light guide based on SiO2+GeO2 as the active medium, an ytterbium laser emitting in the wavelength 1.117 mc as the pumping source, and 5 Bragg fibre-optical gratings as the distributed reflectors for wavelengths of 1.175 mc, 1.24 mc, 1.31 mc, 1.40 mc and 1.48 that form, respectively, 5 resonators for 1st, 2nd, 3d, 4th and 5th Stokes components W. Y. Cheung, W. A. Reed, V. Mizhari, T. Erdogan, P. J. Lemaire, A. M. Vengsarkar, D. J. DiGiovanni, D. W. Peckham, B. H. Rockhey. High-Power 1.48 mc Cascaded Raman Laser in Germanium Silicate Fibres. Optical Amp. and Their Appl., Davos, USA, 15-17 Jun. 1995, p 197-1991!.
The drawbacks of this laser is its complexity caused by the necessity to use five pairs of Bragg gratings and a relatively low efficiency of converting the radiation into 5th Stokes component. Furthermore, Bragg gratings do not have a sufficient depth of the refraction index modulation.
A Raman fibre laser emitting wavelength .lambda.=1.48 mc, comprising a fibre light guide based on SiO2+GeO2 as the active medium, a solid body laser emitting in the wavelength of about 1 mc as the pumping source, and 6 Bragg fibre-optical gratings as the distributed reflectors for wavelengths of 1.117 mc, 1.175 mc, 1.24 mc, 1.31 mc, 1.40 mc and 1.48 mc that form, respectively, 5 resonators for 1st, 2nd, 3d, 4th, 5th and 6th W. Y. Cheung, W. A. Reed, V. Mizhari, T. Erdogan, P. J. Lemaire, A. M. Vengsarkar, D. J. DiGiovanni, D. W. Peckham, B. H. Rockhey. High-Power 1.48 mc Cascaded Raman Laser in Germanium Silicate Fibres. Optical Ampl. and Their Appl., Davos, USA, 15-17 Jun. 1995, p. 197-199!.
The drawbacks of this laser is its complexity caused by the necessity to use six pairs of Bragg gratings, and a relatively low efficiency of converting the radiation into 5th Stokes component. Moreover, Bragg gratings have not a sufficient depth of the refraction index modulation.
The most proximate to the claimed lasers is the known Raman laser, comprising a fibre light guide based on SiO2+GeO2 as the active medium, a neodymium laser emitting in the wavelength of 1.06 mc as the pumping source, and 3 Bragg fibre-optical gratings as the distributed reflectors for wavelengths of 1.117 mc, 1.175 mc and 1.24 mc that form, respectively, G. Grubb, T. Erdogan, V. Mizhari, T. Strasser, W. Y. Cheung, W. A. Reed, P. J. Lemaire, A. E. Miller, S. C. Kosinski, G. Nykolak, P. C. Becker, D. W. Peckham. 1.3 mc Cascaded Raman Amplifier in Germanium Silicate Fibres. Optical Ampl. and Their Appl., Colorado, USA, 3-5 Aug. 1994, 187-190!.
The drawbacks of this laser is its complexity caused by the necessity to use three pairs of Bragg gratings, and a relatively low efficiency of converting the radiation into 3d Stokes component.
An optical fibre is known that contains phosphorus to reduce the period of erbium ions relaxation and, as the result, the attenuation of the energy 5,225,925, dated Jun. 7, 1995, IPC H 01 S 3/16!.
The drawback of this fibre is the impossibility to obtain radiation in the wavelengths of 1.24 mc and 1.48 owing to the presence of erbium ions in composition of the optical fibre.
A Bragg gaig is known that is used as a distributed reflector and implemented in the form of a portion of a fibre light guide, the core 5,237,576, dated Jul. 08, 1995. IPC H 01 S 3/17!.
The drawback of this grating is its low efficiency for the reason that the chemical composition of the optical fibre core is not optimised.
The method is known for changing the refraction index in an optical waveguide of germanium silicate glass, inclusive of the step of acting on a fibre light guide along the optical axis by a laser radiation in the Johnson and B. S. Kawasaki. Photosensitivity in optical fibre waveguides: application to reflection filter fabrication. Appl. Phys. Lett. Vol. 32910), 647-649 (1978)!. Here an argon lase
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Dianov Evgeny Mikhailovich
Prokhorov Alexandr Mikhailovich
Healy Brian
Nauchny Tsentr Volokonnoi Optiki Pri Institute Obschei Fiziki Ro
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