Short pulse lasers using large mode area fibers and higher order modes

An optical pulse, high-order mode technology, applied in the field of optical fiber equipment, can solve problems affecting high-energy pulse compression and transmission, spectral distortion, pulse amplification, etc.

Inactive Publication Date: 2007-06-06
FURAKAWA ELECTRIC NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one difficulty in applying femtosecond pulses to optical fibers is how to amplify the pulses to high power levels
Optical fiber nonlinearity distorts the spectrum and affects compression and transmission of high-energy pulses

Method used

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  • Short pulse lasers using large mode area fibers and higher order modes
  • Short pulse lasers using large mode area fibers and higher order modes
  • Short pulse lasers using large mode area fibers and higher order modes

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Embodiment Construction

[0023] We recently proposed an erbium amplifier to amplify femtosecond pulses from a 1580nm femtosecond fiber laser. This is described in US Patent Application No. 11 / 105850, filed April 4, 2005, incorporated herein by reference. The amplifier works under the principle of self-similar transmission, and the output of the amplifier is a highly extended pulse with a nearly linear frequency modulation pulse. A schematic diagram of this amplifier is shown in FIG. 1 , where the output of the laser 11 is directed through a fiber amplifier 12 . For the purposes of this work, pulse quality Q is defined as the ratio of the central (strongest) pulse energy to the energy contained in the entire pulse, including any reference or auxiliary pulses. An illustration of these definitions is shown in Figure 2. The main pulse body is shown at 21 and the reference pulse at 23 . The half-maximum point of the full pulse width is shown at 22 . An ideal pulse has a Q of 1. A high Q value is an im...

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Abstract

The invention describes an optical fiber device for propagating and recompressing high energy, ultrashort pulses with minimal distortions due to nonlinearity. The device is based on propagation in a higher order mode (HOM) of a few-moded fiber. Coupling into the HOM may be accomplished using long-period gratings. Features of the HOM fiber mode that are useful for high quality pulse compression include large effective area, high dispersion and low dispersion slope. In a preferred case the long period gratings go through a turnaround point (TAP) at the wavelength of operation.

Description

technical field [0001] This invention relates to fiber optic devices, such as lasers and amplifiers, which generate high power levels through the use of large mode effective areas. In particular, it relates to devices that achieve better performance when fiber optic devices are intentionally operated in higher order modes. Background technique [0002] (some of the following are not necessarily prior art) [0003] Fiber lasers with high pulse energy, high beam quality and excellent optical properties are used in many fields and industries, such as analytical spectroscopy (fluorescence, absorption), lighting, remote sensing and environmental spectroscopy (wind speed, biohazard, ecological system mapping, etc.), ranging and homing (avoiding mid-air collisions, military applications, etc.), and scientific instruments. Fiber lasers with extremely short pulse widths, such as femtosecond fiber lasers, have particular applications in these and other fields. [0004] Much progres...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/00G02B6/00G02F1/35H04B10/2507H04B10/2537H04B10/2543H04B10/2581
CPCH01S3/0057H01S3/06725G02B6/02266G02B6/02023G02B6/02019G02B6/03633
Inventor 西达尔斯·拉马钱德兰杰弗瑞·尼科尔森
Owner FURAKAWA ELECTRIC NORTH AMERICA INC
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