CN105048268A - Integrated phase biasing device and optical fiber laser employing same - Google Patents
Integrated phase biasing device and optical fiber laser employing same Download PDFInfo
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- CN105048268A CN105048268A CN201510534250.8A CN201510534250A CN105048268A CN 105048268 A CN105048268 A CN 105048268A CN 201510534250 A CN201510534250 A CN 201510534250A CN 105048268 A CN105048268 A CN 105048268A
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Abstract
The invention discloses an optical fiber laser employing an integrated phase biasing device. A first two-way output end of an optical fiber coupler is connected with a mode-locked pulse generator; a second two-way output end of the optical fiber coupler is connected with a wavelength division multiplexer and a phase biasing device; the other end of the phase biasing device is connected with a third two-way output end of the optical fiber coupler; the phase biasing device comprises a package tube; a first polarization-maintaining optical fiber and a second polarization-maintaining optical fiber are respectively fixed at two ends of the package tube; a first collimating lens, a polarizer, a first faraday rotator, a birefringent wave plate, a second faraday rotator and a second collimating lens are sequentially arranged between light paths of the first polarization-maintaining optical fiber and the second polarization-maintaining optical fiber; the wavelength division multiplexer is connected with the first polarization-maintaining optical fiber or the second polarization-maintaining optical fiber; and the third two-way output end of the optical fiber coupler is connected with the first polarization-maintaining optical fiber or the second polarization-maintaining optical fiber, so that self-starting and long-term stable mode locking in the optical fiber laser are realized; and the dependency of the mode-locked optical fiber laser on the environment stability is lowered.
Description
[technical field]
The present invention relates to Fiber laser technology, particularly relate to a kind of integrated phase bias device and apply the fiber laser of this phase bias device.
[background technology]
Along with the progress of science and technology, the application of ultrashort pulse fiber laser in scientific research and industrial processes is more and more extensive, serves irreplaceable effect.Ultrashort pulse fiber laser has pulse width, the feature that peak power is high.But contrast traditional Q-switched laser, mode-locked laser is difficult to self-starting, is subject to external interference, and price is high, hamper its application.
Non-linear loop speculum, saturable absorber, nonlinear polarization rotation are three kinds of main flow locked mode schemes of fiber laser: the 8 font mode locked fiber laser locked modes that non-linear loop speculum is formed are difficult to self-starting, need to regulate by outside, export as the inclined pulse of non-guarantor; In saturable absorber mode-locked laser, semiconductor saturable absorber is short for useful life, easily damages at high power, and power output is low; The easy qualitative change lose locked mode start-up performance in adverse circumstances of other carbon back saturable absorbers.Above-mentioned nonlinear polarization rotation mode locked fiber laser; very high average power can be provided; and adopt different mechanism to form pulse; obtain different repetition rate, psec or femtosecond pulse row on a large scale; but this locked mode mechanism adopts non PM fiber; so the disturbance of outer bound pair optical fiber can change birefringence in optical fiber and nonlinear effect, thus cause the losing lock of laser, therefore very strong to environmental factor dependence.
Wherein, the 8 shaped optical fiber lasers that non-linear loop speculum is made can provide mode locking pulse, but the mode-locked laser which produces can not realize self-starting substantially, and reason is that its loop is zero offset.And in zero offset situation, loop speculum is very little to the susceptibility of nonlinear phase shift, in loop, need very strong luminous power to realize locked mode, therefore need a phase bias to realize propagating in opposite directions in same optical fiber the light path difference of light, make it produce phase shift.
[summary of the invention]
Instant invention overcomes the deficiency of above-mentioned technology, provide the fiber laser of a kind of integrated phase bias device and application integration phase bias device, realize self-starting and locked mode steady in a long-term in fiber laser, reduce mode locked fiber laser to the dependence of environmental stability.
For achieving the above object, present invention employs following technical proposal:
A kind of integrated phase bias device, include package tube 1, described package tube 1 two ends are fixed with the first polarization maintaining optical fibre 21, second polarization maintaining optical fibre 22 respectively, and the light path between described first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 is provided with the first collimating lens 31, the polarizer 4, first Faraday rotator 51, birefringent wave plate 6, second Faraday rotator 52, second collimating lens 32 in turn.
Described first polarization maintaining optical fibre 21 is fixed on the first fibre holder 71, and described second polarization maintaining optical fibre 22 is fixed on the second fibre holder 72.
Described first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 are protects inclined gain fibre, big mode field area polarization maintaining optical fibre, big mode field area double clad polarization maintaining optical fibre or polarization-maintaining photonic crystal fiber.
A kind of fiber laser of application integration phase bias device, include fiber coupler 8, the two-way output of described fiber coupler 8 first is connected with mode locking pulse generator 9, the two-way output of described fiber coupler 8 second is connected with wavelength division multiplexer 10, phase bias device 11, described phase bias device 11 other end is connected with the two-way output of fiber coupler 8 the 3rd, described phase bias device 11 includes package tube 1, described package tube 1 two ends are fixed with the first polarization maintaining optical fibre 21 respectively, second polarization maintaining optical fibre 22, the first collimating lens 31 is provided with in turn between described first polarization maintaining optical fibre 21 and the light path of the second polarization maintaining optical fibre 22, the polarizer 4, first Faraday rotator 51, birefringent wave plate 6, second Faraday rotator 52, second collimating lens 32, described wavelength division multiplexer 10 is connected with the first polarization maintaining optical fibre 21 or the second polarization maintaining optical fibre 22, the two-way output of described fiber coupler 8 the 3rd is connected with the first polarization maintaining optical fibre 21 or the second polarization maintaining optical fibre 22.
Described mode locking pulse generator 9 is light launcher, dispersion compensation device or spatial filter arrangement.
Described light launcher includes light emission mirror 121, and described fibre optical transmission mirror 121 is connected with band pass filter 122, and described band pass filter 122 is connected with fiber coupler 8.
Described mode locking pulse generator 9 is fiber reflector, is connected with dispersion compensation device 13 between described wavelength division multiplexer 10 and phase bias device 11.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention realizes self-starting and locked mode steady in a long-term in fiber laser, reduce mode locked fiber laser to the dependence of environmental stability, structure and the combination of devices that can change laser change laser pulse Forming Mechanism simultaneously, comprise orphan, self similarity, Totally positive dispersion and amplification self similarity etc.
[accompanying drawing explanation]
Fig. 1 is the structural representation of phase bias device;
Fig. 2 is the fiber laser embodiment one of application phase bias device;
Fig. 3 is the fiber laser embodiment two of application phase bias device;
Fig. 4 is the fiber laser embodiment three of application phase bias device;
Fig. 5 is the fiber laser embodiment four of application phase bias device.
[embodiment]
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technical staff of the same trade:
As shown in Figure 1, a kind of integrated phase bias device, include package tube 1, described package tube 1 two ends are fixed with the first polarization maintaining optical fibre 21, second polarization maintaining optical fibre 22 respectively, and the light path between described first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 is provided with the first collimating lens 31, the polarizer 4, first Faraday rotator 51, birefringent wave plate 6, second Faraday rotator 52, second collimating lens 32 in turn.
Wherein, described first polarization maintaining optical fibre 21 is fixed on the first fibre holder 71, and described second polarization maintaining optical fibre 22 is fixed on the second fibre holder 72, and the fast axle of the first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 is parallel to each other, and slow axis is also parallel to each other, and input and output each other; First Faraday rotator 51 is contrary with the direction of rotation of the second Faraday rotator 52 to incident light polarization direction, same direction; Through the light of the first polarization maintaining optical fibre 21 incidence, again through the polarizer 4 after accurate first straight lens 31, the polarization direction of the polarizer 4 becomes miter angle with slide axle, again successively through the first Faraday rotator 51 and birefringent wave plate 6, polarization direction rotation 45 degree is parallel with an axle of slide, again through the second Faraday rotator 52, enter the second polarization maintaining optical fibre 22 after polarization direction opposite spin 45 degree after the second collimating lens 32, phase shift is φ
1, polarization direction keeps originally constant; Equally, from the light of the second polarization maintaining optical fibre 22 incidence, after contrary path round-trip one circle, phase shift is φ
2, polarization direction still remains unchanged, from the first polarization maintaining optical fibre 21 outgoing, wherein, and φ
1≠ φ
2.
Now through phase-shifter, operation principle is illustrated to light: the incident light through the first polarization maintaining optical fibre 21 collimates through the first collimating lens 31, when forming vibration, polarization direction is consistent with the polarization direction of the polarizer 4, be incident to the first Faraday rotator 51, its polarization direction is rotated 45 degree, parallel with the slow axis of wave plate crystal or fast axle, obtain phase shift φ
1after, incide on the second Faraday rotator 52; Through the second Faraday rotator 52 rear polarizer direction opposite spin 45 degree, because the fast axle of the first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 is parallel to each other, slow axis is parallel to each other, so the propagation polarization state that light enters the second polarization maintaining optical fibre 22 is identical with the circulation way in the first polarization maintaining optical fibre 21.Same mode, through the polarization direction of the incident light of the second polarization maintaining optical fibre 22 along fast axle, through the second collimating lens 32, then the second faraday rotation mirror 52 is incident to, its polarization direction is rotated 45 degree, parallel with the fast axle of wave plate crystal or slow axis, obtains phase shift φ
2after, incide the first Faraday rotator 51; Through the first edge, Faraday rotator 51 rear polarizer direction and the polarizer 4 direction of rotation phase despining 45 degree, thus enter into the first polarization maintaining optical fibre 21, from the first polarization maintaining optical fibre 21 outgoing.
Described first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 can adopt dissimilar polarization maintaining optical fibre, such as, protect inclined gain fibre, big mode field area polarization maintaining optical fibre, big mode field area double clad polarization maintaining optical fibre, polarization-maintaining photonic crystal fiber etc.According to wavelength chooses or design polarization maintaining optical fibre, not by the restriction of wavelength.The process of angle or mode field area is carried out in the termination of polarization maintaining optical fibre.Guarantor's folk prescription of two polarization maintaining optical fibres is to spatially parallel to each other.When the operation principle of the first polarization maintaining optical fibre 21 and the second polarization maintaining optical fibre 22 is the polarization maintaining optical fibres only having single fast axle or single slow axis to propagate, the polarizer 4 in phase-shifter can remove, and directly ensures that the working shaft of polarization maintaining optical fibre becomes 45 degree with the fast axle of wave plate or slow axis.
Fast axle and the slow axis of the wave plate crystal in this phase bias device introduce asymmetric phase shift, and the pulsed light backpropagation of identical polarization causes different light paths, cause phase deviation different, i.e. phase bias.Incident from the first polarization maintaining optical fibre 21, from the second polarization maintaining optical fibre 22 outgoing, generation phase shift is φ
1; Incident from the second polarization maintaining optical fibre 22, from the first polarization maintaining optical fibre 21 outgoing, generation phase shift is φ
2, the phase shift difference of the two
size determined by wave plate character and thickness, namely
wherein, ne is the refractive index of e light, and no is the refractive index of o light, and l is the thickness of wave plate, and λ is wavelength.Adopt one piece of birefringent wave plate 6, combined by the thickness of initialization system or wave plate, form specific phase difference, the phase bias arranged arbitrarily is provided.
Further, this phase bias device, the first fibre holder 71, first collimating lens 31, the polarizer 4, first Faraday rotator 51, birefringent wave plate 6, second Faraday rotator 52, second collimating lens 32, second fibre holder 72 are arranged in encapsulation steel pipe 1 successively.
The optical alignment that optical fiber exports by the first collimating lens 31 and the second collimating lens 32, adopts gradient index fiber or non-spherical lens.
As shown in Figure 2, a kind of fiber laser of application integration phase bias device, it is characterized in that: include fiber coupler 8, the two-way output of described fiber coupler 8 first is connected with mode locking pulse generator 9, the two-way output of described fiber coupler 8 second is connected with wavelength division multiplexer 10, phase bias device 11, described phase bias device 11 other end is connected with the two-way output of fiber coupler 8 the 3rd, described phase bias device 11 includes package tube 1, described package tube 1 two ends are fixed with the first polarization maintaining optical fibre 21 respectively, second polarization maintaining optical fibre 22, the first collimating lens 31 is provided with in turn between described first polarization maintaining optical fibre 21 and the light path of the second polarization maintaining optical fibre 22, the polarizer 4, first Faraday rotator 51, birefringent wave plate 6, second Faraday rotator 52, second collimating lens 32, described wavelength division multiplexer 10 is connected with the first polarization maintaining optical fibre 21 or the second polarization maintaining optical fibre 22, the two-way output of described fiber coupler 8 the 3rd is connected with the first polarization maintaining optical fibre 21 or the second polarization maintaining optical fibre 22.
Embodiment one:
Described mode locking pulse generator 9 is light launcher, and described light launcher includes light emission mirror 121, and described fibre optical transmission mirror 121 is connected with band pass filter 122, and described band pass filter 122 is connected with fiber coupler 8.
As shown in Figure 2, fiber coupler 8 has four ports, be respectively the first two-way output port 1., the second two-way output port 2., the 3rd two-way output port 3., output 4., 1. mode-locked laser pulse inputs to the first two-way output port of fiber coupler 8,3. exports respectively from the two-way output port of the second two-way output port the 2. with three; 2. the first polarization maintaining optical fibre 21 that the mode-locked laser pulse exported from the second two-way output port inputs to phase bias device 11 by wavelength division multiplexer 10 and gain fibre or the second polarization maintaining optical fibre 22; 3. the first polarization maintaining optical fibre 21 that the mode-locked laser pulse exported from the 3rd two-way output port inputs to phase bias device 11 or the second polarization maintaining optical fibre 22, and then enter fiber amplifier and amplify; 4. 1. the two-way laser pulse exported from phase bias device 11 export with output through the first two-way output port of fiber coupler 8.In the ring that 3. the two-way output port of the two-way output port of fiber coupler 8 second the 2. with three is connected to form, the light that two-way is propagated in opposite directions is because obtain phase difference through phase bias device 11, produce in fiber coupler 8 and interfere, affect the change of the two-way output port of the first two-way output port 1. with the second 2. output intensity.The effect of phase bias device 11 is the beam intensity ratios that improve two outputs, rises and can set output port output intensity ratio.
Fiber laser of the present invention can obtain mode-locked laser pulse row, and laser works state is not by the interference of external environment condition; Structure and the combination of devices that can change laser change laser pulse Forming Mechanism, comprise orphan, self similarity, Totally positive dispersion and amplification self similarity etc.The output of fiber coupler 8,4. as the output port of fiber laser, also can utilize partially reflecting mirror to be located at the first two-way output port 1., or by optical fiber type coupling beam divider.
Embodiment two:
Described mode locking pulse generator 9 is dispersion compensation device.
As shown in Figure 3, fiber laser comprises: fiber coupler 8, wavelength division multiplexer 10, phase bias device 11, dispersion compensation device; Dispersion compensation device replaces band pass filter and light reflecting mirror in embodiment one, and it can make pulse in chamber, realize certainly being in harmony of pulse duration and spectral width in oscillatory process in the laser.
Embodiment three:
Described mode locking pulse generator 9 is spatial filter arrangement.
As shown in Figure 4, fiber laser comprises: fiber coupler 8, wavelength division multiplexer 10, phase bias device 11, spatial filter arrangement; Spatial filter arrangement replaces band pass filter and light reflecting mirror in embodiment one, and it plays the effect of reflection and filtering in laser chamber simultaneously.
Embodiment four:
Described mode locking pulse generator 9 is fiber reflector, is connected with dispersion compensation device 13 between described wavelength division multiplexer 10 and phase bias device 11.
As shown in Figure 5, fiber laser comprises: fiber coupler 8, wavelength division multiplexer 10, phase bias device 11, fiber reflector 11 and dispersion compensation device 12; In this structure, dispersion compensation device is in the ring of fiber coupler 7, can realize certainly being in harmony of pulse duration and spectral width when pulse is vibrated in chamber.
It is finally noted that, the object publicizing and implementing mode is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (7)
1. an integrated phase bias device, it is characterized in that: include package tube (1), described package tube (1) two ends are fixed with the first polarization maintaining optical fibre (21), the second polarization maintaining optical fibre (22) respectively, and the light path between described first polarization maintaining optical fibre (21) and the second polarization maintaining optical fibre (22) is provided with the first collimating lens (31), the polarizer (4), the first Faraday rotator (51), birefringent wave plate (6), the second Faraday rotator (52), the second collimating lens (32) in turn.
2. the integrated phase bias device of one according to claim 1, it is characterized in that: described first polarization maintaining optical fibre (21) is fixed on the first fibre holder (71), described second polarization maintaining optical fibre (22) is fixed on the second fibre holder (72).
3. the integrated phase bias device of one according to claim 1, is characterized in that: described first polarization maintaining optical fibre (21) and the second polarization maintaining optical fibre (22) are protects inclined gain fibre, big mode field area polarization maintaining optical fibre, big mode field area double clad polarization maintaining optical fibre or polarization-maintaining photonic crystal fiber.
4. the fiber laser of an application integration phase bias device, it is characterized in that: include fiber coupler (8), the two-way output of described fiber coupler (8) first is connected with mode locking pulse generator (9), the two-way output of described fiber coupler (8) second is connected with wavelength division multiplexer (10), phase bias device (11), described phase bias device (11) other end is connected with the two-way output of fiber coupler (8) the 3rd, described phase bias device (11) includes package tube (1), described package tube (1) two ends are fixed with the first polarization maintaining optical fibre (21) respectively, second polarization maintaining optical fibre (22), the first collimating lens (31) is provided with in turn between described first polarization maintaining optical fibre (21) and the light path of the second polarization maintaining optical fibre (22), the polarizer (4), first Faraday rotator (51), birefringent wave plate (6), second Faraday rotator (52), second collimating lens (32), described wavelength division multiplexer (10) is connected with the first polarization maintaining optical fibre (21) or the second polarization maintaining optical fibre (22), the two-way output of described fiber coupler (8) the 3rd is connected with the first polarization maintaining optical fibre (21) or the second polarization maintaining optical fibre (22).
5. the fiber laser of a kind of application integration phase bias device according to claim 4, is characterized in that: described mode locking pulse generator (9) is light launcher, dispersion compensation device or spatial filter arrangement.
6. the fiber laser of a kind of application integration phase bias device according to claim 5, it is characterized in that: described light launcher includes light emission mirror (121), described fibre optical transmission mirror (121) is connected with band pass filter (122), and described band pass filter (122) is connected with fiber coupler (8).
7. the fiber laser of a kind of application integration phase bias device according to claim 4, it is characterized in that: described mode locking pulse generator (9) is fiber reflector, is connected with dispersion compensation device (13) between described wavelength division multiplexer (10) and phase bias device (11).
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Cited By (3)
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| CN106961067A (en) * | 2017-05-24 | 2017-07-18 | 广东量泽激光技术有限公司 | A kind of compact technical grade mode locked fiber laser of high repetition frequency |
| CN108736300A (en) * | 2018-05-24 | 2018-11-02 | 广东华快光子科技有限公司 | A kind of optical fiber laser convenient for generation high repeat frequency pulsed laser |
| CN113206430A (en) * | 2021-03-30 | 2021-08-03 | 华南师范大学 | Phase shifter, mode-locked laser and control method of mode-locked laser |
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Cited By (3)
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| CN106961067A (en) * | 2017-05-24 | 2017-07-18 | 广东量泽激光技术有限公司 | A kind of compact technical grade mode locked fiber laser of high repetition frequency |
| CN108736300A (en) * | 2018-05-24 | 2018-11-02 | 广东华快光子科技有限公司 | A kind of optical fiber laser convenient for generation high repeat frequency pulsed laser |
| CN113206430A (en) * | 2021-03-30 | 2021-08-03 | 华南师范大学 | Phase shifter, mode-locked laser and control method of mode-locked laser |
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| CN105048268B (en) | 2018-11-06 |
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