Passively modelocked fiber laser using carbon nanotubes

A fiber laser and passive mode-locking technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problem that lasers cannot generate pulse width, etc., and achieve the effect of reducing cavity length, reducing overall length, and increasing repetition frequency

Inactive Publication Date: 2010-05-26
OFS FITEL LLC
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Problems solved by technology

However, pulse widths for lasers based on such a mode-locking mechanism cannot produce pulse widths in the range of 100 fs

Method used

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  • Passively modelocked fiber laser using carbon nanotubes
  • Passively modelocked fiber laser using carbon nanotubes
  • Passively modelocked fiber laser using carbon nanotubes

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Embodiment Construction

[0027] figure 1 An exemplary high repetition, ultrashort pulse bandwidth fiber ring laser 10 formed in accordance with embodiments of the present invention is shown. Fiber ring laser 10 includes a length of rare earth-doped optical fiber 12 that may serve as the amplifying element of the laser structure (also referred to herein as "gain medium" or "gain fiber"). The gain fiber 12 is doped to exhibit a peak pump signal absorption greater than 50 dB / m, with values ​​of 80 dB / m, 150 dB / m or even higher being desired to minimize the fiber length required to achieve acceptable amplification.

[0028] A source of input pump light, shown as pump laser 14 , is coupled to gain fiber 12 through wavelength division multiplexer (WDM) 16 . A pump laser 14 provides an input optical pump signal in gain fiber 12 at a wavelength suitable to produce amplification. The remainder of the fiber ring laser 10 includes lengths of undoped optical fiber 18 for providing signal paths to and from the r...

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Abstract

The present invention a passively modelocked fiber laser using carbon nanotubes. The passively modelocked fiber laser utilizes a rare-earth-doped fiber section as the gain medium, which exhibits a relatively high absorption (e.g., peak pump absorption > 50 dB / m) and relatively low dispersion (e.g., -20 ps / km-nm < D g < 0). Passive modelocking is provided by a single-walled carbon nanotube (SWNT) saturable absorber, formed on endface portions of a section of un-doped fiber. The remaining components (input / output couplers, isolator) are preferably integrated into a single component and coupled to the un-doped optical fiber. This combination yields a laser cavity with a slightly anomalous overall dispersion, preferred for soliton generation and creating optical pulses with a sub-picosecond pulse width and repetition frequency over 100 MHz.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 099978, filed September 25, 2008, which is hereby incorporated by reference. technical field [0003] The present invention relates to a passively mode-locked fiber laser, and more particularly, to a fiber laser using a carbon nanotube saturable absorber integrated with an optical fiber to generate a short pulse width and high repetition rate fiber laser. Background technique [0004] Passively mode-locked fiber lasers are known to be reliable sources of ultrashort pulses (eg, pulses less than picosecond in width). In addition to ultrashort pulse widths, lasers with high pulse repetition frequencies (eg, several hundred MHz) can also be used in applications such as frequency metrology and high-speed optical sampling. For practical purposes, these sources must be compact, reliable and require minimal power consumption. Mode-locked erbium-doped fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/10H01S3/094H01S3/098
CPCH01S3/06791H01S3/1618H01S2301/085H01S3/1608H01S3/1118H01S3/06725H01S3/06712
Inventor 杰弗里·尼科尔森
Owner OFS FITEL LLC
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