Totally positive dispersion cavity mode-locked all-fiber laser

A fully positive dispersion and laser technology, applied in the structure/shape of the active medium, active medium materials, etc., can solve the problems of small spectral interval, affecting the full optical fiber of the laser cavity, and small adjustment range, so as to achieve the goal of laser cavity The effect of stabilization and laser design simplification

Inactive Publication Date: 2011-09-14
SUZHOU UNIV
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AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The spectral interval of the two different reflection peaks (with different polarization states) caused by the inherent large birefringence of the polarization maintaining fiber is relatively small and the adjustment range is small; 2. Due to the narrow bandwidth Polarization-maintaining fiber grating is used as the reflective surface of the laser cavity, so it is difficult to realize passive mode-locking to generate ultra-short laser pulses; 3. This cavity structure is suitable for narrow-linewidth tunable dual-wavelength fiber lasers
The above-mentioned technology adopts the concept of working in the negative dispersion region, and there are solid diffraction grating pairs or photonic bandgap fiber gratings in the cavity for dispersion compensation, etc., which also affects the full-fiber laser cavity and affects the long-term stability of the mode-locked fiber laser. Sex, or the cost of the laser is very expensive to affect its scope of use

Method used

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  • Totally positive dispersion cavity mode-locked all-fiber laser
  • Totally positive dispersion cavity mode-locked all-fiber laser
  • Totally positive dispersion cavity mode-locked all-fiber laser

Examples

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Embodiment 1

[0069] This embodiment provides a mode-locked fully polarization-maintaining doped Yb that works in the full positive dispersion region and is environmentally stable. 3+ The structure of the fiber linear cavity laser uses a section of polarization-maintaining rare-earth-doped gain fiber as the gain medium, and a band-pass polarization-maintaining long-period fiber grating filter with appropriate center wavelength and bandwidth is used in the cavity to select the center wavelength and spectrum of the mode-locked laser. Filter pulse compression components to realize stable mode-locked oscillation of all-fiber ultrashort pulse lasers.

[0070] See attached figure 1 , which is a schematic diagram of the cavity structure of the linear cavity mode-locked fully polarization-maintaining fiber laser in this embodiment; a band-pass polarization-maintaining long-period fiber grating filter with an appropriate center wavelength and bandwidth is used as the center wavelength of the mode-lo...

Embodiment 2

[0072] This embodiment provides a mode-locked dual-wavelength fully polarization-maintaining doped Y that works in the full positive dispersion region and works in a stable environment. b 3+ Structure of a fiber linear cavity laser. A section of polarization-maintaining rare-earth-doped gain fiber is used as the gain medium, and two band-pass polarization-maintaining long-period fiber grating filters with appropriate center wavelength (center wavelength 1.0-1.1μm adjustable) and bandwidth of 4-12nm are applied in the cavity The device is used as an element for selective tuning of the central wavelength of the dual-wavelength mode-locked fiber laser and spectral filtering optical pulse compression. The semiconductor saturable absorber is used to realize the stable mode-locked oscillation of the dual-wavelength all-fiber ultrashort pulse laser.

[0073] figure 2 It is a schematic diagram of the cavity structure of a dual-wavelength all-fiber linear cavity laser that adopts semi...

Embodiment 3

[0075] This embodiment provides a mode-locked dual-wavelength fully polarization-maintaining Y doped with full positive dispersion and stable environment. b 3+ Structure of a linear cavity fiber laser. Two polarization-maintaining rare-earth-doped gain fibers with different lengths are used as the gain medium, and two band-pass long-period polarization-maintaining fiber grating filters with an appropriate center wavelength (1.0-1.1μm) and a bandwidth of 4-12nm are applied in the cavity As an element for selective tuning of the central wavelength of a dual-wavelength mode-locked fiber laser and spectral filtering optical pulse compression, a semiconductor saturable absorber is used to realize the mode-locked oscillation of a dual-wavelength fully positive dispersion cavity all-fiber ultrashort pulse laser.

[0076] image 3 It is a schematic diagram of the cavity structure of a dual-wavelength all-fiber linear cavity laser that uses a semiconductor saturable absorber to achie...

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Abstract

The invention discloses a totally positive dispersion cavity mode-locked all-fiber laser, which is an environmentally-stable, novelly-structured and totally-optical mode-locked super-short laser pulse laser which works in a totally positive dispersion area and uses rare earth-mixed optical fibers as a laser gain medium, a polarization beam splitter to split light, a band-pass long-period fiber grafting filter as a mode-locked laser centre wavelength selection and mode-locked laser spectrum filtering optical pulse compression element, and a semiconductor saturable absorber as a mode-locked element and the like to form an optical fiber laser structure with high repetition rate, high power, simple structure and high efficiency. The laser outputs picosecond and femtosecond optical pulse-width polarized laser with a wavelength of 1 mu m which, after being amplified by the high-power optical fiber amplifier, can be used for molecularly systemic pumping-detection ultrafast optical physical experiment or environment monitoring, microwave photonic or biophysical detection, double-wavelength pumping-detection ultrafast optical physical experiment, frequency-combining optical radiation generation, coherent anti-stokes Raman scattering microscopy, micromachining and the like.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a passively mode-locked all-fiber laser with high pulse repetition rate ultrashort laser pulse output, which is suitable for generating stable ultrashort laser pulse output for biomedicine such as multiphoton imaging microscopy Applications, etc. and the use of direct difference frequency method to generate ultrashort pulse mid-infrared laser radiation for pumping and detection of molecular systems and other scientific experiments, environmental monitoring and microwave photonics and biophysical detection, etc., belong to the field of optical information technology. Background technique [0002] Today's scientific experiments such as pumping and detection of molecular systems, environmental monitoring, microwave photonics and biophysical detection require mid-infrared light sources with high average power ultrashort pulses. In recent years, with the development of solid-state laser media such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/16
Inventor 刘东峰张桂菊王钦华余建军
Owner SUZHOU UNIV
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