CN109672078B - Pulse seed source and laser system with same - Google Patents

Pulse seed source and laser system with same Download PDF

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Publication number
CN109672078B
CN109672078B CN201811390574.9A CN201811390574A CN109672078B CN 109672078 B CN109672078 B CN 109672078B CN 201811390574 A CN201811390574 A CN 201811390574A CN 109672078 B CN109672078 B CN 109672078B
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port
output
beam combiner
isolator
saturable absorber
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CN109672078A (en
Inventor
蔡一鸣
李莎
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Wuhan Raycus Fiber Laser Technologies Co Ltd
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Wuhan Raycus Fiber Laser Technologies Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10084Frequency control by seeding
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06708Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06716Fibre compositions or doping with active elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10038Amplitude control
    • H01S3/10046Pulse repetition rate control
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106Mode locking
    • H01S3/1112Passive mode locking
    • H01S3/1115Passive mode locking using intracavity saturable absorbers

Abstract

The invention provides a pulse seed source and a laser system with the same, wherein the pulse seed source comprises a pumping source, a beam splitter, a first beam combiner, a resonant cavity component and an output mechanism; the output end of the pump source is connected with the input end of the beam splitter, the first output port of the beam splitter is connected with the input port of the first beam combiner, and the first output port of the first beam combiner is connected with the input port of the resonant cavity component; the second output port of the beam splitter and the second output port of the first beam combiner are both connected with the input port of the output mechanism; the resonant cavity component comprises a reflection grating, a first gain fiber and a saturable absorber integration mechanism; one port of the reflection grating is connected with a first output port of the first beam combiner, the other port of the reflection grating is connected with one port of the first gain optical fiber, and the other port of the first gain optical fiber is connected with the saturable absorber integration mechanism. The invention has simple structure and low maintenance cost.

Description

Pulse seed source and laser system with same
Technical Field
The present invention relates to laser technology, and more particularly, to a pulsed seed source and a laser system having the same.
Background
Ultrafast laser has extremely short pulse and extremely high peak power, so that laser cold processing in the true sense is realized when the ultrafast laser interacts with substances, and therefore, ultrafast laser technology is also popular in research of various countries at present, and represents the development direction of the laser technology at present. The ultra-fast picosecond and femtosecond seed source is a key component of the ultra-fast laser, and the reliability and stability of the laser are directly determined by the performance of the seed source.
Currently, there are three main methods for obtaining picosecond pulses from industrialized picosecond seed sources: 1. directly modulating a fast-response semiconductor laser; 2. the picosecond pulse output is realized by using nonlinear polarization rotation mode locking effect through some nonlinear crystals; 3. picosecond pulses are obtained by using a saturable absorbing material as an optical switch.
Picosecond pulses obtained by directly modulating a fast response semiconductor laser typically have a pulse width limit of hundreds picoseconds and a power of tens to hundreds microwatts, and cannot be used as a seed source for an ultrafast laser. The ultra-fast laser picosecond seed source used in the industrial market at present mainly uses nonlinear crystals, and uses nonlinear polarization rotation mode locking effect to realize pulse output with pulse width of tens of femtoseconds to tens of picoseconds. The solid seed source has the defects of complex structure, large volume, high cost, poor stability, high maintenance cost and the like due to the special spatial structure of the solid seed source.
Disclosure of Invention
First, the technical problem to be solved
The invention provides a pulse seed source and a laser system with the pulse seed source, which are used for solving the technical problems of complex structure, poor stability and high maintenance cost of the pulse seed source in the prior art.
(II) technical scheme
In order to solve the above technical problems, according to an aspect of the present invention, there is provided a pulse seed source, including a pump source, a beam splitter, a first beam combiner, a resonant cavity assembly, and an output mechanism; the output end of the pump source is connected with the input end of the optical splitter, the first output port of the optical splitter is connected with the input port of the first beam combiner, and the first output port of the first beam combiner is connected with the input port of the resonant cavity component; the second output port of the beam splitter and the second output port of the first beam combiner are both connected with the input port of the output mechanism;
the resonant cavity assembly comprises a reflection grating, a first gain fiber and a saturable absorber integration mechanism; one port of the reflection grating is connected with the first output port of the first beam combiner, the other port of the reflection grating is connected with one port of the first gain optical fiber, and the other port of the first gain optical fiber is connected with the saturable absorber integration mechanism.
Further, the saturable absorber integration mechanism comprises a saturable absorber; the saturable absorber is adhered to a jumper wire port of the saturable absorber integration mechanism, and the end face of the saturable absorber is perpendicular to an optical path projected onto the saturable absorber.
Further, the output mechanism comprises a second beam combiner and an output terminal; the second output port of the beam splitter is connected with the second output port of the first beam combiner, and the second output port of the beam splitter is connected with the input port of the second beam combiner;
the first isolator is arranged between the second beam combiner and the output terminal, an input port of the first isolator is connected with an output port of the second beam combiner, and an output port of the first isolator is connected with the output terminal.
Further, a second gain fiber is also included; and one port of the second gain optical fiber is connected with the output port of the second beam combiner, and the other port of the second gain optical fiber is connected with the input port of the first isolator.
Further, a second isolator is also included; the input port of the second isolator is connected with the second output port of the first beam combiner, and the output port of the second isolator is connected with the input port of the output mechanism.
Further, a second gain fiber is also included; one port of the second gain optical fiber is connected with a second output port of the first beam combiner, and the other port of the second gain optical fiber is connected with an input port of the output mechanism.
Further, a second isolator is also included; the input port of the second isolator is connected with the second output port of the first beam combiner, the output port of the second isolator is connected with one port of the second gain optical fiber, and the other port of the second gain optical fiber is connected with the input port of the output mechanism.
According to another aspect of the present invention, there is also provided a laser system comprising the above pulsed seed source.
(III) beneficial effects
The application provides a pulse seed source and have laser system of this pulse seed source, its beneficial effect mainly as follows:
dividing an optical signal emitted by a pumping source into two paths, wherein one path is directly output to a pumping leg of a second beam combiner, and the other path is processed by a resonant cavity component and then output to a signal leg of the second beam combiner, and amplified and then output as a laser signal; in addition, the saturable absorber of the saturable absorber integration mechanism in the resonant cavity assembly is stuck to the jumper wire port, and the saturable absorber is vertically arranged in the light path, so that the structure can be simplified, and the stability of the pulse seed source can be improved; in addition, through the two-stage gain optical fiber amplification treatment, the return light is isolated by the two isolators, so that the signal intensity can be further enhanced and the stable operation can be realized. The pulse seed source can be used for providing seed source laser with stable power and pulse width less than 10 ps.
Drawings
FIG. 1 is a schematic diagram of a pulsed seed source according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pulsed seed source according to an embodiment of the present invention;
in the figure, the 1-saturable absorber integrating mechanism, the 2-first gain optical fiber, the 3-reflection grating, the 4-first beam combiner, the 5-second isolator, the 6-beam splitter, the 7-pump source, the 8-second beam combiner, the 9-first isolator, the 10-output terminal and the 11-second gain optical fiber.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the invention, it should be noted that the terms "first," "second," and "second," are used for clarity in describing the numbering of product components and do not represent any substantial distinction, unless explicitly stated or defined otherwise. The terms "front" and "rear" are used in a conventional sense for the structure of the product. "last", "next" are described based on the arrangement order. The directions of the upper and the lower are all the directions shown in the drawings. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that unless explicitly stated or limited otherwise, the term "coupled" is to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the invention will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1, the present embodiment provides a pulse seed source, which includes a pump source 7, a beam splitter 6, a first beam combiner 4, a resonant cavity assembly, and an output mechanism; the output end of the pump source 7 is connected with the input end of the beam splitter 6, the first output port of the beam splitter 6 is connected with the input port of the first beam combiner 4, and the first output port of the first beam combiner 4 is connected with the input port of the resonant cavity component; the second output port of the beam splitter 6 and the second output port of the first beam combiner 4 are both connected with the input port of the output mechanism;
the resonant cavity assembly comprises a reflection grating 3, a first gain optical fiber 2 and a saturable absorber integration mechanism 1; one port of the reflection grating 3 is connected to the first output port of the first beam combiner 4, the other port of the reflection grating 3 is connected to one port of the first gain fiber 2, and the other port of the first gain fiber 2 is connected to the saturable absorber integration mechanism 1.
The pump source 7 may be a semiconductor pump laser. The generated light source of the pump source 7 enters the optical splitter 6, and is split into two paths of optical signals by the optical splitter 6: a first optical signal and a second optical signal. The beam splitter's split ratio may be adjusted according to the actual situation, for example, it may be 3:7. The first path of optical signals enter the resonant cavity assembly through the first output port of the first beam combiner 4, and enter the output mechanism through the second output port of the first beam combiner 4 after the signal amplification processing and the frequency adjustment of the resonant cavity assembly. The first beam combiner 4 may be a wavelength division multiplexer or a (2+1) x 1 polarization maintaining beam combiner. The beam splitter may employ a polarization maintaining beam splitter.
The resonant cavity assembly comprises a reflection grating 3, a first gain fiber 2 and a saturable absorber integration mechanism 1. The first path of optical signal enters the first beam combiner 4, propagates to the reflection grating 3 through the first beam combiner 4, and propagates to the first gain optical fiber 2 after being reflected by the reflection grating 3. The first path of optical signals are amplified by the first gain optical fiber 2 and then projected to the saturable absorber integration mechanism 1. The optical signal projected to the saturable absorber integration mechanism 1 is transmitted to the first beam combiner 4 through the first gain optical fiber 2 and the reflection grating 3 after being totally reflected, and is output to the output mechanism through the second output port of the first beam combiner 4. Meanwhile, the second optical signal also enters the output mechanism from the second output port of the optical splitter 6, and the two optical signals are output as a laser source via the output mechanism.
It can be understood that the pump source 7, the beam splitter 6, the first beam combiner 4, the resonant cavity assembly and the output mechanism are all welded by optical fibers.
The emission grating, the first gain optical fiber 2 and the saturable absorber integration mechanism 1 form a cavity, and the intensity of the first optical signal can be amplified in the process of propagation of the first optical signal in the cavity; in addition, the frequency of the output laser can be more accurately adjusted by adjusting the cavity length of the cavity. The structure is simple, the components are few, and the maintenance is easy.
In a specific embodiment, the saturable absorber integration mechanism 1 comprises a saturable absorber; the saturable absorber is adhered to the jumper port of the saturable absorber integrated mechanism 1, and the end face of the saturable absorber is perpendicular to the light path projected onto the saturable absorber. On the basis of the above-described embodiment, the present embodiment specifically describes the structure of the saturable absorber integration mechanism 1.
The saturable absorber integration mechanism 1 may be a semiconductor saturable absorber mirror or the like. The saturable absorber of the saturable absorber integration mechanism 1 may be a semiconductor such as SESAM or graphene. The saturable absorber is adhered to the jumper wire port, so that the design of a space light path can be avoided, the stability is higher, the maintenance is easier, and the maintenance cost is low. And moreover, a structure that the saturable absorber is adhered to the jumper wire port is adopted, so that all-fiber fusion of the pulse seed source is more convenient, and the structure can be further simplified. Meanwhile, the saturable absorber is vertically arranged in the light path, so that the total reflection of the first optical signal is facilitated, and the pulse power of mode locking is improved.
In a specific embodiment, the output mechanism comprises a second beam combiner 8 and an output terminal 10; the second output port of the beam splitter 6 is connected with the input port of the second beam combiner 8;
a first isolator 9 is arranged between the second beam combiner 8 and the output terminal 10, an input port of the first isolator 9 is connected with an output port of the second beam combiner 8, and an output port of the first isolator 9 is connected with the output terminal 10.
On the basis of the above embodiments, the present embodiment specifically describes the structure of the output mechanism. The provision of the first isolator 9 between the second beam combiner 8 and the output terminal 10 can prevent or mitigate the adverse effect of back light on the pulsed seed source or the laser system. The second beam combiner 8 may have two input ports, the second output port of the first beam combiner 4 is connected to one input port of the second beam combiner 8, and the second output port of the beam splitter is connected to the other input port of the second beam combiner 8. The two paths of optical signals enter the second beam combiner 8 for beam combination and then are output.
The first beam combiner 4, the second beam combiner 8, and the first isolator 9 may be connected by optical fiber fusion. The second beam combiner 8 may be a wavelength division multiplexer or a (2+1) x 1 polarization maintaining beam combiner. The output terminal 10 may employ bare fibers, jumper outputs, collimated outputs, etc.
In a specific embodiment, the second gain fiber 11 is further included; one port of the second gain fiber 11 is connected to the output port of the second combiner 8, and the other port of the second gain fiber 11 is connected to the input port of the first isolator 9. On the basis of the above embodiments, the present embodiment specifically describes the arrangement of the second gain fiber 11.
The second gain fiber 11 may be disposed between the second combiner 8 and the first isolator 9. The optical signal may be amplified in one step. The second gain optical fiber 11 is matched with the first gain optical fiber 2, so that two-stage amplification treatment can be carried out on an optical signal, the signal intensity of output laser is conveniently enhanced, and the output power is improved.
In a specific embodiment, a second separator 5 is also included; the input port of the second isolator 5 is connected with the second output port of the first beam combiner, and the output port of the second isolator 5 is connected with the input port of the output mechanism. On the basis of the above embodiments, the present embodiment specifically describes the setting state of the second separator 5. A second isolator 5 is arranged between the first beam combiner 4 and the output mechanism, and forms two-stage isolation with the first isolator 9, so that return light can be further isolated, and adverse effects of the return light on a pulse seed source or a laser system are reduced. The output port of the second isolator 5 is connected to the input port of the output mechanism, and the second isolator 5 may be connected to an input port of the second combiner 8.
In a specific embodiment, referring to fig. 2, a second gain fiber 11 is further included; one port of the second gain fiber 11 is connected to the second output port of the first combiner 4, and the other port of the second gain fiber 11 is connected to the input port of the output mechanism. On the basis of the above embodiments, this embodiment specifically describes another arrangement form of the second gain fiber 11.
The second gain optical fiber 11 is disposed between the first beam combiner 4 and the output mechanism, when the output mechanism includes the second beam combiner 8, one port of the second gain optical fiber 11 is connected to the second output port of the first beam combiner 4, and the other port of the second gain optical fiber 11 is connected to an input port of the second beam combiner 8.
In a specific embodiment, a second separator 5 is also included; the input port of the second isolator 5 is connected to the second output port of the first combiner 4, the output port of the second isolator is connected to one port of the second gain fiber 11, and the other port of the second gain fiber 11 is connected to the input port of the output mechanism. On the basis of the above embodiments, the present embodiment specifically describes another setting state of the second separator 5. When the second gain fiber 11 is disposed between the first beam combiner 4 and the second beam combiner 8, the output port of the second isolator 5 is connected to one port of the second gain fiber 11, and the other port of the second gain fiber 11 is connected to the input port of the output mechanism.
Specifically, the first gain fiber 2 and the second gain fiber 11 may both use a high ytterbium-doped single-clad polarization-maintaining fiber or a high ytterbium-doped double-clad polarization-maintaining fiber. It will be appreciated that the specification parameters of the above devices, such as the first separator 9 and the second separator 5, may be selected according to actual needs, for example, the maximum passing power of the first separator 9 and the second separator 5, etc.
In a specific embodiment, there is also provided a laser system comprising the pulsed seed source described above.
The pulse seed source and the laser system with the pulse seed source divide the optical signal emitted by the pumping source into two paths, wherein one path of the optical signal is directly output to one input port of the second beam combiner, namely the pumping leg of the second beam combiner, and the other path of the optical signal is processed by the resonant cavity component and then output to the other input port of the second beam combiner, namely the signal leg of the second beam combiner, and the amplified optical signal is used as a laser signal to be output; in addition, the saturable absorber of the saturable absorber integration mechanism in the resonant cavity assembly is stuck to the jumper wire port, and the saturable absorber is vertically arranged in the light path, so that the structure can be simplified, and the stability of the pulse seed source can be improved; in addition, through the two-stage gain optical fiber amplification treatment, the return light is isolated by the two isolators, so that the signal intensity can be further enhanced and the stable operation can be realized. The pulse seed source can be used for providing seed source laser with stable power and pulse width less than 10 ps.
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The pulse seed source is characterized by comprising a pumping source, a beam splitter, a first beam combiner, a resonant cavity assembly and an output mechanism; the output end of the pump source is connected with the input end of the optical splitter, the first output port of the optical splitter is connected with the input port of the first beam combiner, and the first output port of the first beam combiner is connected with the input port of the resonant cavity component; the second output port of the beam splitter and the second output port of the first beam combiner are both connected with the input port of the output mechanism;
the resonant cavity assembly comprises a reflection grating, a first gain fiber and a saturable absorber integration mechanism; one port of the reflection grating is connected with the first output port of the first beam combiner, the other port of the reflection grating is connected with one port of the first gain optical fiber, and the other port of the first gain optical fiber is connected with the saturable absorber integration mechanism.
2. The pulsed seed source of claim 1, wherein the saturable absorber integration mechanism comprises a saturable absorber; the saturable absorber is adhered to a jumper wire port of the saturable absorber integration mechanism, and the end face of the saturable absorber is perpendicular to an optical path projected onto the saturable absorber.
3. The pulsed seed source of claim 1, wherein the output mechanism comprises a second combiner and an output terminal; the second output port of the beam splitter is connected with the second output port of the first beam combiner, and the second output port of the beam splitter is connected with the input port of the second beam combiner;
the first isolator is arranged between the second beam combiner and the output terminal, an input port of the first isolator is connected with an output port of the second beam combiner, and an output port of the first isolator is connected with the output terminal.
4. The pulsed seed source of claim 3, further comprising a second gain fiber; and one port of the second gain optical fiber is connected with the output port of the second beam combiner, and the other port of the second gain optical fiber is connected with the input port of the first isolator.
5. The pulsed seed source of claim 1 or 4, further comprising a second isolator; the input port of the second isolator is connected with the second output port of the first beam combiner, and the output port of the second isolator is connected with the input port of the output mechanism.
6. The pulsed seed source of claim 1, further comprising a second gain fiber; one port of the second gain optical fiber is connected with a second output port of the first beam combiner, and the other port of the second gain optical fiber is connected with an input port of the output mechanism.
7. The pulsed seed source of claim 6, further comprising a second isolator; the input port of the second isolator is connected with the second output port of the first beam combiner, the output port of the second isolator is connected with one port of the second gain optical fiber, and the other port of the second gain optical fiber is connected with the input port of the output mechanism.
8. A laser system comprising the pulsed seed source of any one of claims 1-7.
CN201811390574.9A 2018-11-21 2018-11-21 Pulse seed source and laser system with same Active CN109672078B (en)

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