CN215452032U

CN215452032U - Rechargeable battery driven hand-held type pulse fiber laser

Info

Publication number: CN215452032U
Application number: CN202120137175.2U
Authority: CN
Inventors: 牟成博; 黄梓楠; 黄千千; 戴礼龙
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2022-01-07
Anticipated expiration: 2031-01-19

Abstract

The utility model discloses a handheld pulse fiber laser driven by a rechargeable battery, which comprises a pumping optical module and an oscillator module, wherein the pumping optical module comprises the rechargeable battery, a pumping driving control circuit, a semiconductor laser diode, a switch and a display control module, and the oscillator module comprises a wavelength division multiplexer, a gain optical fiber, an output coupler, a saturable absorber and a polarization-independent isolator. The utility model supplies power for the semiconductor laser diode through the built-in battery, provides pumping energy for the oscillator, and the shell is provided with the charging interface, so that the battery can be charged through the external power supply, the laser is not limited by the types of the power supply, the cable and the interface, meanwhile, the oscillator realizes full polarization-maintaining fiber, has stable output, compact structure and easy packaging, and greatly improves the flexibility and portability of the pulse fiber laser. The utility model has simple structure, small volume, low cost and lower power consumption, and can realize the modular design of the pulse laser seed source.

Description

Rechargeable battery driven hand-held type pulse fiber laser

Technical Field

The utility model relates to a handheld pulse fiber laser, in particular to a handheld pulse fiber laser driven by a rechargeable battery, which is driven by the rechargeable battery and belongs to the field of fiber lasers.

Background

Ultrashort pulse laser plays more and more important role in modern industrial application and basic scientific research, and is widely applied to precision micromachining, life medicine, aerospace, military and national defense, material science, spectral characteristic detection, nonlinear optics and the like. With the increasing development speed of the industrial field towards high-end and intelligent directions in recent years, the technology of the ultrashort pulse fiber laser is mature, and the ultrashort pulse fiber laser gradually replaces the traditional solid laser with the advantages of compact structure, high electro-optical efficiency, excellent beam quality, high reliability, low maintenance cost and the like, and becomes one of the most popular research directions in the laser technical field at present.

In recent years, a plurality of companies have promoted mature ultrashort pulse fiber laser series products on the laser market, and generally, the current commercial ultrashort pulse fiber lasers all need a pumping light source to excite a laser working substance and are pumped from a low energy level to a high energy level so as to realize the population inversion; then enters a resonant cavity through a wavelength division multiplexer, a saturable absorption mechanism is adopted in the resonant cavity to realize mode locking to generate ultrashort pulses, and a light isolator is used to realize unidirectional operation; finally, stable pulse light is output through the optical coupler. The pump light source needs to be powered by an external power supply, is easily limited by power supply or cable length, and the use of other devices and even space devices leads to the fact that the whole laser system is large in size and high in cost, is easily affected by external environment disturbance, cannot be used in a portable mode, and greatly restricts the application range of the ultrashort pulse fiber laser. Therefore, a small and compact handheld type ultrashort pulse fiber laser with stable output is built, low power consumption and vibration resistance portability are achieved, and the handheld type ultrashort pulse fiber laser has great practical significance.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects that the conventional ultra-short pulse fiber laser is large in size, needs to be powered by an external power supply and is not easy to carry, the laser adopts the rechargeable battery as the power supply, uses an all-fiber structure to realize small integration, and aims to improve the flexibility and the portability of the pulse fiber laser.

In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme:

a hand-held pulse fiber laser driven by a rechargeable battery comprises a pumping optical module and an oscillator module, wherein the pumping optical module internally comprises a semiconductor laser diode driven by the rechargeable battery, is controlled by a pumping driving control circuit, and is connected with a switch button and a display control screen on a shell to complete control; the oscillator module is formed by sequentially connecting a wavelength division multiplexer, a gain optical fiber, an output coupler, a saturable absorption device and a polarization-independent isolator to form a resonant cavity, a semiconductor laser diode of a pumping optical module provides pumping energy, and an output end of the oscillator module is connected to an optical fiber output port of a laser shell.

Preferably, the laser is externally provided with a charging interface, a switch button and a display control screen, the battery can be charged through an external power supply, the power supply of the battery is switched on or off through a switch, and the size of the pumping current is controlled through the display control screen.

Preferably, polarization maintaining optical fiber devices are adopted in the oscillator modules in the laser, and are connected through optical fiber fusion to realize a full polarization maintaining structure; compactly winding the optical fiber and fixedly packaging; and a saturable absorber in the oscillator module adopts a mode locking device with saturable absorption effect.

Preferably, the oscillator module is connected with the pump optical module, the laser diode generates pump continuous light, the pump continuous light is connected to a pump input port of the wavelength division multiplexer, the pump light is coupled into the oscillator, a common end of the rear wavelength division multiplexer is connected with a section of gain optical fiber to absorb the pump light and amplify the pump light, the common end of the rear wavelength division multiplexer is connected with an input end of the output coupler, one output port of the output coupler is used as an output signal end of the laser, the other output port of the output coupler is connected with an input end of the polarization-independent isolator after being inserted into the saturable absorber, and an output end of the polarization-independent isolator is connected to a signal input end of the wavelength division multiplexer to form the all-fiber ring resonator.

Preferably, the lengths of the gain fiber and other single-mode fibers used in the oscillator module can be adjusted according to circumstances, and the dispersion compensation fiber can be used for managing the intracavity dispersion so as to realize the mode-locked pulse output of different pulse shaping mechanisms.

Preferably, the laser instrument shell is equipped with the interface that charges, and the accessible charges the interface and charges for the battery.

Preferably, the laser shell is provided with a switch key and a display control module, the power supply of the laser can be switched on or switched off through the switch key, and the control key adjusts the size of the pumping current and displays the pumping current through a display screen.

Preferably, the gain fiber is a rare earth ion doped silica glass fiber, the working band of the pump laser diode corresponds to the absorption wavelength of the gain fiber, and the working bands of other fiber devices in the oscillator correspond to the working band of the gain fiber.

Preferably, the saturable absorber is a single-walled carbon nanotube film, and can also be other mode locking devices with saturable absorption effects, such as a semiconductor saturable absorber mirror, graphene, black phosphorus, a topological insulating material, and the like.

Preferably, the dispersion and length of the gain fiber and other single-mode fibers can be adjusted according to conditions, and the dispersion compensation fiber can be used for managing the intracavity dispersion so as to realize mode-locked pulses of different pulse shaping mechanisms.

Compared with the prior art, the utility model has the following substantive characteristics and advantages:

1. the utility model provides a handheld pulse fiber laser driven by a built-in battery, which is provided with a charger to charge the handheld pulse fiber laser, and is not limited by the types of power supplies, cables and interfaces, so that the flexibility of the pulse fiber laser is greatly improved;

2. the existing ultrashort pulse fiber laser generally needs to use a free space device, the whole laser system has larger volume and needs multiple complex mechanical fixation, and the fiber laser oscillator only consists of a polarization-maintaining fiber device, realizes full polarization-maintaining full optical fiber, is compactly fixed and packaged, has stable output, compact structure and small volume, and greatly improves the portability and stability of the pulse fiber laser;

3. the device has the advantages of simple structure, convenient use and simple maintenance.

Drawings

Fig. 1 is a schematic structural diagram of a rechargeable battery-driven handheld pulse fiber laser according to the present invention.

Fig. 2 is a schematic diagram of a pumping light module according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an oscillator module according to an embodiment of the utility model.

Fig. 4 is a graph of an output pulse spectrogram and an autocorrelation trajectory in an embodiment of the present invention.

Detailed Description

The preferred embodiments of the utility model are detailed below:

the first embodiment is as follows:

referring to fig. 1 to 3, a handheld pulse fiber laser driven by a rechargeable battery mainly comprises a pumping optical module 101 and an oscillator module 102, wherein the pumping optical module 101 internally comprises a rechargeable battery 201 driving a semiconductor laser diode 203, is controlled by a pumping driving control circuit 202, and is connected with a switch button 104 and a display control screen 107 on a shell to complete control; the oscillator module 102 is formed by sequentially connecting a wavelength division multiplexer 301, a gain fiber 302, an output coupler 303, a saturable absorber 304 and a polarization-independent isolator 305 to form a resonant cavity, and is provided with pumping energy by a semiconductor laser diode 203 of a pumping optical module, and the output end is connected to the fiber output port 105 of the laser housing.

The handheld pulse fiber laser driven by the rechargeable battery in the embodiment is used as a power supply source, and the all-fiber structure is used for realizing small integration, so that the flexibility and the portability of the pulse fiber laser are improved.

Example two

This embodiment is substantially the same as the above embodiment, and is characterized in that:

in this embodiment, a charging interface, a switch button 104 and a display control screen 107 are provided outside the laser, so that the battery can be charged by an external power supply, the power supply is switched on or off by a switch, and the pumping current is controlled by the display control screen.

In this embodiment, the oscillator modules 102 in the laser device all adopt polarization maintaining fiber devices, and are connected by fiber fusion to realize a full polarization maintaining structure; compactly winding the optical fiber and fixedly packaging; the saturable absorber in the oscillator module 102 employs a mode-locked device with saturable absorption effect.

In this embodiment, the oscillator module 102 is connected to a pump optical module, the laser diode generates a pump continuous optical connection to a pump input port of the wavelength division multiplexer, the pump light is coupled into the oscillator, a common port of the wavelength division multiplexer is connected to a section of gain fiber to absorb the pump light and amplify the pump light, and then the common port is connected to an input port of the output coupler, one output port of the output coupler is used as an output signal port of the laser, the other output port is inserted into the saturable absorber and then connected to an input port of the polarization independent isolator, and then an output port of the polarization independent isolator is connected to a signal input port of the wavelength division multiplexer to form an all-fiber ring resonator.

In this embodiment, the lengths of the gain fiber and other single-mode fibers used in the oscillator module 102 may be adjusted according to circumstances, and the dispersion compensation fiber may be used to manage the intra-cavity dispersion, so as to implement mode-locked pulse output of different pulse shaping mechanisms.

In this embodiment, the laser instrument shell is equipped with the interface that charges, and the accessible charges the interface and charges for the battery.

In this embodiment, laser instrument shell is equipped with on & off switch and demonstration control module, switches on or cuts off the laser instrument power through the on & off switch, and the control key adjusts the pumping current size and is shown by the display screen.

The device of the embodiment is a handheld pulse fiber laser driven by a built-in battery, and is provided with a charger to charge the handheld pulse fiber laser, so that the handheld pulse fiber laser is not limited by the types of a power supply, a cable and an interface, and the flexibility of the pulse fiber laser is greatly improved; the fiber laser oscillator is composed of polarization maintaining fiber devices, achieves full polarization maintaining and full optical fiber, is compactly and fixedly packaged, has stable output, compact structure and small size, and greatly improves portability and stability of a pulse fiber laser.

EXAMPLE III

as shown in fig. 1, the rechargeable battery-driven handheld pulse fiber laser includes a pump optical module 101 and an oscillator module 102, an interlayer fixing plate 103, and a switch button 104, an optical fiber output port 105, a charging interface 106, and a display control screen 107.

Specifically, as shown in fig. 2, which is a top view of a pump optical module, a rechargeable battery 201 (dashed line) is installed at the bottom inside the laser to provide power for a pump drive control circuit 202 to supply power, a semiconductor laser diode 203 is welded on the pump drive control circuit 202, the laser diode 203 is driven by the pump drive control circuit 202 to generate continuous light with a central wavelength of 976nm, and a pigtail thereof is connected to a pump optical port of the wavelength division multiplexer 301 in fig. 3 through optical fiber welding.

Specifically, as shown in fig. 3, which is a top view of the oscillator module, a pump light port of the wavelength division multiplexer 301 is connected to the semiconductor laser diode 203 of the pump light module, and injects continuous pump light into the ring resonator; then enters the erbium-doped fiber 302 to provide amplification gain effect for the input optical signal; the other end of the erbium-doped fiber 302 is connected to the input end of an output coupler 303 with the coupling ratio of 60:40, wherein 60% of the output end of the output coupler 303 is used as the signal output end of the whole pulse fiber laser system and is connected to the fiber output port 105 on the laser shell; the 40% output end is connected with the optical fiber connectors 304, and the single-walled carbon nanotube film as the saturable absorber is clamped between the two optical fiber connectors 304 and continuously circulates in the cavity; the other end is transmitted to the input end of the polarization independent isolator 305, and the polarization independent isolator 305 is used for ensuring that the laser performs unidirectional circulation in the ring cavity; the output of the polarization independent isolator 305 is connected to the signal optical port of the wavelength division multiplexer 301, thereby forming an all-fiber ring resonator. In the embodiment, the length of the polarization maintaining erbium-doped fiber is 0.68m, and the other fibers are standard single mode fibers; the laser cavity is full negative dispersion and works in a soliton mode locking area.

The working process of this embodiment is described as follows:

when the battery is charged, a switch button 104 on the housing is pressed to supply power to the pump driving control circuit 202, a Start key on the display control screen 107 is pressed to turn on the pump control circuit, and a plus key controls the pump current to drive the semiconductor laser diode 203 and gradually increase the pump current, and the output port of the output coupler 303, namely the laser output port 105, is connected with instruments such as a spectrometer or an oscilloscope for signal monitoring until a stable mode-locked pulse spectrum or a pulse sequence appears. As shown in fig. 4(a), when the pump power is raised above the mode-locking threshold, i.e., when the pump power is raised to 72.8mW, a stable mode-locked spectrum occurs at a center wavelength of 1556.83nm, with a spectral bandwidth of 6.35 nm; FIG. 4(b) shows a stable pulse sequence on the oscilloscope for this time, with a pulse interval of 31.7ns, corresponding to a repetition frequency of 31.48 MHz; measuring the signal by a frequency spectrograph to obtain a graph (c) in fig. 4, wherein the signal-to-noise ratio at the fundamental frequency of 31.48MHz is 60dB, and an inset graph is a frequency spectrum distribution graph in the range of 3.2GHz, so that the stability of mode locking pulses is further proved; simultaneously measuring the autocorrelation locus as shown in fig. 4(d), and obtaining the uncompressed pulse width of 378fs through hyperbolic secant fitting; the average power of the output pulse at this time was 5.34 mW.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the technical solutions of the present invention, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. For example, the pulse fiber laser is not limited to work in a 1.5 μm waveband, and stable output of pulse light in other wavebands such as 1 μm and 2 μm can be realized by replacing a gain fiber, a device, a saturable absorber and the like in the corresponding working waveband; the output pulse of the pulse fiber laser is not limited to the traditional soliton pulse, and other pulse shaping mechanisms such as pulse broadening, soliton dissipation, self-similar quantum and the like can be realized through other means such as dispersion management and the like.

To sum up, the handheld pulse fiber laser driven by the rechargeable battery in the above embodiment includes a pumping optical module and an oscillator module, where the pumping optical module includes the rechargeable battery, a pumping driving control circuit, a semiconductor laser diode, a switch, and a display control module, and the oscillator module includes a wavelength division multiplexer, a gain fiber, an output coupler, a saturable absorber, and a polarization-independent isolator. According to the utility model, the semiconductor laser diode is powered by the built-in battery to provide pumping energy for the oscillator, the shell is provided with the charging interface, and the battery can be charged by the external power supply, so that the laser is not limited by the types of the power supply, the cable and the interface, meanwhile, the oscillator realizes full polarization-maintaining fiber, the output is stable, the structure is compact, the packaging is easy, and the flexibility and the portability of the pulse fiber laser are greatly improved. In addition, the device of the embodiment has the advantages of simple structure, small volume, low cost and low power consumption, can realize the modular design of the pulse laser seed source, and has wide commercial application prospect.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes and modifications can be made according to the purpose of the utility model, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, as long as the purpose of the present invention is met, and the present invention shall fall within the protection scope of the present invention without departing from the technical principle and the concept of the present invention.

Claims

1. A rechargeable battery-driven handheld pulse fiber laser comprising a pump light module (101) and an oscillator module (102), characterized in that: the pumping light module (101) internally comprises a rechargeable battery (201) for driving a semiconductor laser diode (203), is controlled by a pumping driving control circuit (202), and is connected with a switch button (104) and a display control screen (107) on the shell to complete control; the oscillator module (102) is formed by connecting a wavelength division multiplexer (301), a gain fiber (302), an output coupler (303), a saturable absorption device (304) and a polarization-independent isolator (305) in sequence to form a resonant cavity, a semiconductor laser diode (203) of a pumping optical module provides pumping energy, and the output end of the semiconductor laser diode is connected to a fiber output port (105) of a laser shell.

2. The rechargeable battery-driven handheld pulsed fiber laser of claim 1, characterized in that: the laser is externally provided with a charging interface, a switch button (104) and a display control screen (107), a battery can be charged through an external power supply, the power supply of the laser is switched on or off through a switch, and the pumping current is controlled through the display control screen.

3. The rechargeable battery-driven handheld pulsed fiber laser of claim 1, characterized in that: polarization maintaining optical fiber devices are adopted in the oscillator modules (102) in the laser and are connected through optical fiber fusion to realize a full polarization maintaining structure; compactly winding the optical fiber and fixedly packaging; a saturable absorber in the oscillator module (102) adopts a mode locking device with saturable absorption effect.

4. The rechargeable battery-driven handheld pulsed fiber laser of claim 1, characterized in that: the oscillator module (102) is connected with the pumping light module, the laser diode generates pumping continuous light which is connected to a pumping input port of the wavelength division multiplexer, the pumping light is coupled into the oscillator, a common end of the rear wavelength division multiplexer is connected with a section of gain optical fiber to absorb the pumping light and amplify the pumping light, the common end of the rear wavelength division multiplexer is connected with an input end of the output coupler, one output port of the output coupler is used as an output signal end of the laser, the other output port of the output coupler is connected with an input end of the polarization-independent isolator after being inserted into the saturable absorber, and then an output end of the polarization-independent isolator is connected to a signal input end of the wavelength division multiplexer to form the all-fiber ring resonator.

5. The rechargeable battery-driven handheld pulsed fiber laser of claim 1, characterized in that: in the oscillator module (102), the lengths of gain fiber and other single mode fiber may be adjusted as appropriate; and managing the intracavity dispersion by using the dispersion compensation fiber so as to realize mode-locked pulse output of different pulse shaping mechanisms.