All-optical-fibre mode-locked laser based on Kerr effect of multi-mode interference device
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of multi-mode interference device and mode-locked laser, applied in the field of lasers, can solve the problems of low damage threshold, increase system complexity, etc., and achieve the effect of high damage threshold, simple structure, and improved laser output power
Active Publication Date: 2015-03-11
TIANJIN UNIV
View PDF8 Cites 6 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
An obvious disadvantage of such passively mode-locked fiber lasers is that the saturable absorbing devices used, such as semiconductor saturable absorbing mirrors (SESAMs), carbon nanotubes, and graphene, generally have low damage thresholds an
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0023] In order to solve the problem of low damage threshold of the saturable absorption mode-locking element in the existing passive mode-locked fiber laser, which limits the laser output power, see figure 1 , the embodiment of the present invention provides an all-fiber mode-locked laser based on the Kerr effect of a multi-mode interference device. The all-fiber mode-locked laser includes: a pump source 1, a signal pump combiner 2, an active optical fiber 3, Mode interference device 4, output coupler 5 and isolator 6,
[0024] The pump source 1 emits the pump light in the absorption band of the active fiber 3, and the pump light enters the active fiber 3 through the signal-pump combiner coupling 2; the active fiber 3 absorbs the pump light to form a population inversion , to generate laser gain; the multimode interference device 4 is formed by fusing a section of multimode fiber in the middle of two sections of single-mode fiber, and its transmission peak is consistent with ...
Embodiment 2
[0028] In the embodiment of the present invention, taking a fiber laser with a wavelength of 1.5 μm as an example, the laser light intensity is modulated by using the optical Kerr effect in the multimode interference device 4 to cause a change in the transmission spectrum, so as to realize the mode-locked operation of the fiber laser, and the damage threshold of the device is high. , and cost-effective, see the following description for details:
[0029] An all-fiber mode-locked laser based on the Kerr effect of multimode interference devices, mainly including: pump source 1, signal pump beam combiner 2, active optical fiber 3, multimode interference device 4, output coupler 5, isolation device 6;
[0030] Among them, in order to obtain 1.5μm laser output, the active fiber 3 adopts SM-EYDF-6 / 125-HE double-clad Er / Yb co-doped single-mode fiber, and its core numerical aperture NA=0.18, cladding NA>0.46, The length is 5m; correspondingly, the pump source 1 uses a fiber-coupled s...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention discloses an all-optical-fibre mode-locked laser based on the Kerr effect of a multi-mode interference device; a pumping source emits an active optical fibre to absorb pump light in a band; after being coupled through a signal pumping beam combiner, the pump light enters the active optical fibre; the active optical fibre absorbs the pump light to form population inversion, so that laser gain is generated; the multi-mode interference device is formed by welding a section of multi-mode optical fibre in the middle of two sections of single-mode optical fibres; the transmission peak of the multi-mode optical fibre is the same to the gain peak of the active optical fibre; the signal pumping beam combiner, the active optical fibre, the multi-mode interference device, an output coupler and an isolator are in fusion welding in sequence, so that a one-way annular laser resonant cavity is formed; under the action of laser, the refractive index of the multi-mode optical fibre is changed; furthermore, the position of a multi-mode interference self-imaging point is changed; the transmittance of the multi-mode optical fibre at the position of laser wavelength is changed, so that the laser intensity of the annular laser resonant cavity is modulated; and the output coupler outputs ultra-short pulse laser. The all-optical-fibre mode-locked laser based on the Kerr effect of the multi-mode interference device disclosed by the invention is high in laser output power and low in cost.
Description
technical field [0001] The invention relates to the field of lasers, in particular to an all-fiber mode-locked laser based on the Kerr effect of a multi-mode interference device. Background technique [0002] Ultrafast mode-locked lasers are widely used in basic research, medicine, defense and industrial processing. Due to the many advantages of fiber lasers such as compact structure, high efficiency, robustness, and high cost performance, various stable and compact mode-locked fiber lasers have been developed. Compared with active mode-locking, passive mode-locked fiber lasers have obvious advantages in many aspects. For example, the response and recovery time of saturable absorbers or Kerr-type devices are generally very short, so the pulse width generated by passive mode-locking Usually narrower than active mode-locking; no spatial light modulator and corresponding electronics are required, so the structure is simpler and more compact; and it is not affected by electrica...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more