CN216312321U - All-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output - Google Patents
All-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output Download PDFInfo
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- CN216312321U CN216312321U CN202123045283.6U CN202123045283U CN216312321U CN 216312321 U CN216312321 U CN 216312321U CN 202123045283 U CN202123045283 U CN 202123045283U CN 216312321 U CN216312321 U CN 216312321U
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Abstract
The utility model discloses an all-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output, which comprises a pumping source, wherein the pumping source is connected with a pumping port of a wavelength division multiplexer, and a signal port of the wavelength division multiplexer is connected to a common port of the wavelength division multiplexer through a polarization controller, a polarization-related optical fiber isolator, a first optical fiber output coupler, a first section of erbium-doped optical fiber, a second optical fiber output coupler and a second section of erbium-doped optical fiber in sequence; the stable unimodal pulse of the laser is output from the energy output port of which the output proportion of the first fiber output coupler is lower than 10%; and the stable double-peak pulse of the laser is output from an energy output port of which the output proportion of the second fiber output coupler is lower than 10%. Through dispersion management and parameter regulation, unimodal pulse and bimodal pulse output can be generated at different output positions of the fiber laser simultaneously.
Description
Technical Field
The utility model relates to the technical field of optical engineering, ultrafast nonlinear fiber optics dynamics and fiber lasers, in particular to an all-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output.
Background
The fiber laser is an ideal platform for generating ultrashort pulses, and the soliton theory plays an important role in describing the generation and propagation of ultrashort pulses in the fiber laser. Conventional soliton theory only discusses anomalous dispersion regions in optics, particularly fiber optics: spontaneous equilibrium of anomalous dispersion effects and nonlinear kerr effects results in the generation of ultrashort pulses, but the pulse energy of the generated ultrashort pulses is only in the order of hundreds of picojoules [1-3 ]. To increase the pulse energy, a dispersion management structure is introduced to increase the pulse energy of the resulting dispersion management solitons to the nanojoule level [4] by introducing a gain fiber with normal dispersion in the fiber laser and maintaining the overall dispersion of the laser in the near-zero dispersion region by controlling the length of the passive fiber with anomalous dispersion. The pulses produced were all unimodal pulses. Ultrashort pulse outputs of 47fs can be obtained directly in erbium doped fiber lasers [5,6] by dispersion management and control of the nonlinear evolution in the laser cavity.
The double peak pulse is a pulse capable of obviously distinguishing two peak structures in a time domain, and can be used for inhibiting parasitic oscillation of the titanium sapphire multi-pass amplifier as a pump [7 ]. The characteristic of time domain double-peak pump pulse is utilized to adjust the time delay of the seed light and amplify the 800nm seed light at the single-pass time interval of the multi-pass amplifier, so that the transverse gain of the titanium sapphire crystal in the whole amplification process is kept at a very low level, the parasitic oscillation in the titanium sapphire crystal is effectively inhibited, and the amplification efficiency of the seed light is improved.
To produce a bimodal or multimodal pulse, a time domain replication technique is generally used to produce a multimodal pulse by replicating and multiplexing the original unimodal pulse. There is no report of producing both unimodal and bimodal pulses in one laser. According to the soliton theory, high-order solitons can be generated by propagating in the optical fiber, so that it is possible to directly generate multimodal pulses in the optical fiber laser.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an all-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output, which is based on a nonlinear polarization rotation mode-locking technology and aims to simultaneously generate single-peak pulse and double-peak pulse output in the laser by utilizing the pulse splitting recoverability of high-order solitons in an optical fiber with normal dispersion gain.
The utility model adopts the following technical scheme for realizing the purposes of the utility model:
the utility model provides an all-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output, which comprises a pumping source and a fiber ring cavity formed by connecting a wavelength division multiplexer, a polarization controller, a polarization-related fiber isolator, a first fiber output coupler, a first section of erbium-doped fiber, a second fiber output coupler and a second section of erbium-doped fiber;
the pump source is connected with a pump port of the wavelength division multiplexer, and a signal port of the wavelength division multiplexer is connected with a common port of the wavelength division multiplexer through a polarization controller, a polarization-related optical fiber isolator, a first optical fiber output coupler, a first section of erbium-doped optical fiber, a second optical fiber output coupler and a second section of erbium-doped optical fiber in sequence;
the stable unimodal pulse of the laser is output from the energy output port of which the output proportion of the first fiber coupler is lower than 10%;
and the stable double-peak pulse of the laser is output from an energy output port of which the output proportion of the second fiber coupler is lower than 10%.
Furthermore, the pumping source is a semiconductor laser coupled by a single-mode optical fiber, the central wavelength of the semiconductor laser is 972-980 nm, and the output tail fiber of the semiconductor laser has anomalous dispersion in a 1.55 mu m wave band and is a single mode.
Further, the wavelength division multiplexer has an operating wavelength of 980/1550nm, and an output tail fiber of the wavelength division multiplexer has anomalous dispersion in a 1.55 μm wave band and is single-mode.
Further, the polarization controller is a three-coil rotary polarization controller or a squeeze polarization controller, and the output tail fiber of the polarization controller has anomalous dispersion in a 1.55 μm waveband and is single-mode.
Further, the polarization-dependent optical fiber isolator adopts a polarization-dependent isolator with the center wavelength of 1550nm, and the output tail fiber of the polarization-dependent optical fiber isolator has anomalous dispersion in a 1.55 mu m waveband and is single-mode.
Further, the first optical fiber output coupler adopts an optical fiber coupler with an output energy ratio of less than 10%, and an output tail fiber of the first optical fiber output coupler has anomalous dispersion in a 1.55 mu m wave band and is single-mode.
Further, the first section of erbium-doped fiber has normal dispersion in a 1.55 μm band and is single-mode, and the length of the erbium-doped fiber is shorter than 0.3 m.
Further, the second optical fiber output coupler adopts an optical fiber coupler with an output energy ratio smaller than 10%, and the input and output tail fibers of the second optical fiber output coupler have normal dispersion in a 1.55 μm wave band and are single-mode.
Further, the second section of erbium-doped fiber has normal dispersion in a 1.55 mu m wave band and is single-mode, and the length of the erbium-doped fiber is longer than 2.7 meters.
Further, the sum of the products of the fiber length and the dispersion of the AB section of the laser in the counterclockwise direction is larger than the sum of the products of the fiber length and the dispersion of the AB section in the clockwise direction.
The utility model has the following beneficial effects:
through dispersion management and parameter regulation, unimodal pulse and bimodal pulse output can be generated at different output positions of the fiber laser;
by regulating and controlling parameters of the laser, the evolution of the pulse in the laser meets the second-order soliton evolution but does not enter a third-order evolution stage, the soliton splitting section and the soliton recovery section are respectively matched and output, the simultaneous output of the double-peak pulse and the single-peak pulse is realized, and the single-peak pulse and the double-peak pulse are respectively output at different working parts of the laser;
and laying a foundation for further outputting the multi-peak pulse.
Drawings
FIG. 1 is a diagram of an experimental setup for implementing an all-fiber mode-locked laser capable of simultaneously generating a single-peak pulse and a double-peak pulse output according to an embodiment of the present invention;
FIG. 2 is a time domain plot of a unimodal pulse of a numerically simulated laser output provided in accordance with an embodiment of the present invention;
FIG. 3 is a time domain diagram of multi-peak pulses of numerically simulated laser output provided in accordance with an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an all-fiber mode-locked laser capable of generating a single-peak pulse and a double-peak pulse simultaneously, which includes a pump source 1 and a fiber ring cavity formed by connecting a wavelength division multiplexer 2, a polarization controller 3, a polarization-dependent fiber isolator 4, a first fiber output coupler 5, a first section of erbium-doped fiber 6, a second fiber output coupler 7 and a second section of erbium-doped fiber 8; wherein the pumping source 1 adopts reverse pumping access, namely the pumping source 1 is connected with the pumping port of the wavelength division multiplexer 2, and the signal port of the wavelength division multiplexer 2 is connected with the common port of the wavelength division multiplexer 2 through a polarization controller 3, a polarization-related optical fiber isolator 4, a first optical fiber output coupler 5, a first section of erbium-doped optical fiber 6, a second optical fiber output coupler 7 and a second section of erbium-doped optical fiber 8 in sequence; the pump source 1, the wavelength division multiplexer 2, the polarization controller 3, the polarization-dependent optical fiber isolator 4 and the first optical fiber output coupler 5 are all prepared and connected by single-mode optical fibers which are single-mode at a wave band of 1.55 mu m and have anomalous dispersion; the first section of erbium-doped fiber 6 and the second section of erbium-doped fiber 8 are both single-mode in a 1.55 mu m wave band and have normal dispersion; the second fiber output coupler 7 is made of a single-mode fiber which is single-mode in the 1.55 mu m wave band and has normal dispersion, and connects the first section of erbium-doped fiber 6 and the second section of erbium-doped fiber 8; the laser stabilized unimodal pulse is output from the 10% energy output port of the first fiber output coupler 5 and the stabilized multi-modal pulse is output from the 10% energy output port of the second fiber output coupler 7.
The pump source is a semiconductor laser coupled by a single-mode optical fiber, the central wavelength of the pump source is 972-980 nm, and the output tail fiber of the pump source has anomalous dispersion in a 1.55 mu m wave band and is a single mode. Preferably, the pigtail type is Corning SMF-28 e.
The wavelength division multiplexer has an operating wavelength of 980/1550nm, and its output tail fiber has anomalous dispersion in 1.55 μm band and is single-mode. Preferably, the pigtail type is Corning SMF-28 e.
The polarization controller is a three-piece coil rotary polarization controller or an extrusion type polarization controller, and the output tail fiber of the polarization controller has anomalous dispersion in a 1.55 mu m wave band and is single-mode. Preferably, the pigtail type is Corning SMF-28 e.
The polarization-dependent optical fiber isolator adopts a polarization-dependent isolator with the central wavelength of 1550nm, and the output tail fiber of the polarization-dependent optical fiber isolator has anomalous dispersion in a 1.55 mu m wave band and is single-mode. Preferably, the pigtail type is Corning SMF-28 e.
The first optical fiber output coupler adopts an optical fiber coupler with the output energy ratio less than 10%, and the output tail fiber of the first optical fiber output coupler has anomalous dispersion in a 1.55 mu m wave band and is single-mode. Preferably, the pigtail type is Corning SMF-28 e.
The first section of erbium-doped fiber has normal dispersion in a 1.55 mu m wave band and is single-mode, and the length of the erbium-doped fiber is shorter than 0.3 meter. Preferably, its pigtail type is OFS EDF 80.
The second optical fiber output coupler adopts an optical fiber coupler with the output energy ratio less than 10%, and the optical fiber for preparing the coupler has normal dispersion in a 1.55 mu m wave band and is a single mode. Preferably, the fiber pigtail type is Corning MetroCor.
The second section of erbium-doped fiber has normal dispersion in a 1.55 mu m wave band and is single-mode, and the length of the erbium-doped fiber is longer than 2.7 meters. Preferably, its pigtail type is OFS EDF 80.
The sum of the products of the fiber length and the dispersion of the AB section of the laser in the anticlockwise direction is larger than the sum of the products of the fiber length and the dispersion of the AB section of the laser in the clockwise direction.
The unimodal pulse of the present invention is output from the first fiber output coupler 5 and the bimodal pulse is output from the second fiber output coupler 7.
The length of the first section of erbium-doped fiber in the laser is shorter than 0.3 meter, the length of the second section of erbium-doped fiber is longer than 2.7 meters, and the sum of the products of the length and the dispersion of the optical fiber of the AB section along the anticlockwise direction is larger than the sum of the products of the length and the dispersion of the optical fiber of the AB section along the clockwise direction, so that the laser is the key for realizing the simultaneous output of single-peak pulses and double-peak pulses.
The time domain plots of the unimodal pulse and the bimodal pulse of the laser output obtained by numerical simulation are shown in fig. 2 and 3, respectively, and the unimodal pulse actually has a background.
The utility model provides a method for simultaneously generating a unimodal pulse and a multimodal pulse, which comprises the following specific steps: pumping continuous light is coupled into the fiber laser through a wavelength division multiplexer; the erbium-doped fiber absorbs the pumping continuous light and emits a long-wave-band pulse by excitation radiation; the pulse oscillates in the fiber laser cavity; the polarization-dependent fiber isolator enables pulses in the fiber laser to operate in a single direction; the polarization-dependent fiber isolator and the polarization controller jointly act to realize the generation of mode-locked pulses caused by nonlinear polarization rotation mode locking; the mode-locked pulse can be transmitted in the optical fiber laser in a second order soliton transmission mode, and the simultaneous output of the unimodal pulse and the multimodal pulse can be realized in different parts of the optical fiber laser.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An all-fiber mode-locked laser capable of simultaneously generating single-peak pulse and double-peak pulse output is characterized by comprising a pumping source and a fiber ring cavity formed by connecting a wavelength division multiplexer, a polarization controller, a polarization-related fiber isolator, a first fiber output coupler, a first section of erbium-doped fiber, a second fiber output coupler and a second section of erbium-doped fiber;
the pump source is connected with a pump port of the wavelength division multiplexer, and a signal port of the wavelength division multiplexer is connected with a common port of the wavelength division multiplexer through a polarization controller, a polarization-related optical fiber isolator, a first optical fiber output coupler, a first section of erbium-doped optical fiber, a second optical fiber output coupler and a second section of erbium-doped optical fiber in sequence;
the stable unimodal pulse of the laser is output from the energy output port of which the output proportion of the first fiber output coupler is lower than 10%;
and the stable double-peak pulse of the laser is output from an energy output port of which the output proportion of the second fiber output coupler is lower than 10%.
2. The all-fiber mode-locked laser of claim 1, wherein the pump source is a single-mode fiber-coupled semiconductor laser with a center wavelength of 972-980 nm and an output pigtail with anomalous dispersion in 1.55 μm band and single mode.
3. The all-fiber mode-locked laser of claim 1, wherein the wavelength division multiplexer has an operating wavelength of 980/1550nm, and the output fiber has anomalous dispersion in 1.55 μm wavelength band and is single-mode.
4. The all-fiber mode-locked laser of claim 1, wherein the polarization controller is a three-plate coil rotating polarization controller or a squeeze-type polarization controller, and the output pigtail has anomalous dispersion in 1.55 μm band and is single-mode.
5. The all-fiber mode-locked laser capable of simultaneously generating a single-peak pulse and a double-peak pulse according to claim 1, wherein the polarization-dependent fiber isolator employs a polarization-dependent isolator with a center wavelength of 1550nm, and the output pigtail has anomalous dispersion in 1.55 μm band and is single-mode.
6. The all-fiber mode-locked laser of claim 1, wherein the first fiber output coupler is a fiber coupler with an output energy ratio of less than 10%, and the output pigtail has anomalous dispersion in 1.55 μm band and is single-mode.
7. The all-fiber mode-locked laser capable of producing both monomodal and bimodal pulse outputs as claimed in claim 1, wherein said first erbium-doped fiber section has normal dispersion in the 1.55 μm band and is single-mode, and the length of erbium-doped fiber is shorter than 0.3 m.
8. The all-fiber mode-locked laser of claim 1, wherein the second fiber output coupler is a fiber coupler with an output energy ratio less than 10%, and the input and output pigtail has normal dispersion in the 1.55 μm band and is single-mode.
9. The all-fiber mode-locked laser capable of producing both monomodal and bimodal pulse outputs as claimed in claim 1, wherein said second erbium-doped fiber section has normal dispersion in the 1.55 μm band and is single-mode, and the length of erbium-doped fiber is longer than 2.7 meters.
10. The all-fiber mode-locked laser of claim 1, wherein the sum of the products of the fiber length and the dispersion of the AB segment of the laser in the counterclockwise direction is greater than the sum of the products of the fiber length and the dispersion of the AB segment in the clockwise direction.
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