CN102208740A - Nanosecond pulse fiber laser with circle structure - Google Patents
Nanosecond pulse fiber laser with circle structure Download PDFInfo
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- CN102208740A CN102208740A CN 201110114348 CN201110114348A CN102208740A CN 102208740 A CN102208740 A CN 102208740A CN 201110114348 CN201110114348 CN 201110114348 CN 201110114348 A CN201110114348 A CN 201110114348A CN 102208740 A CN102208740 A CN 102208740A
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Abstract
The invention relates to a nanosecond pulse fiber laser with a circle structure, belonging to the technical field of lasers. The laser mainly comprises a pumping source (1), a WDM (wavelength division multiplexer) (2), a gain fiber (3), a fiber beam splitter (4), an output end (5) of the fiber beam splitter, a first glass sleeve (6), a first auto-focusing lens (7), a saturable absorber (8), a second auto-focusing lens (9), a second glass sleeve (10), a fiber circulator (11), an FBG (fiber Bragg grating) (12), a reflector (13) and a fiber isolator (14). The glass sleeves, the auto-focusing lenses and the saturable absorber are bonded together to form a miniaturized Q-adjusting component, thus realizing the overall fiber of the fiber laser and reducing the interferences from other external factors. The nanosecond pulse fiber laser has the advantages of small volume, low cost, overall fiber, simple structure, wide application prospects and the like.
Description
Technical field
The present invention relates to a kind of loop configuration nanosecond pulse optical fiber laser, belong to laser technology field.
Background technology
But nanosecond pulse optical fiber laser has, and output beam quality is good, conversion efficiency is high, good heat dissipation effect, need not water-cooling system designed for greater reliability, compact appearance, be easy to the remarkable advantages such as lasing light emitter of the system integration, has been applied in fields such as industrial processes (as: mark, welding, cutting, material surface are handled), laser medicine, laser ranging, military affairs widely.The research nanosecond pulse optical fiber laser mainly adopts acoustooptic modulation and two kinds of methods of semiconductor modulation seed source at present.Compare with passive Q-adjusted method, above-mentioned two kinds of methods have the cavity shape structure of system very complicated, the cost height, and volume is big, is not easy to realize deficiencies such as full fiberize.
Summary of the invention
For solving pulse duration and repetition rate is non-adjustable, the time jitter of pulse train and amplitude jitter more greatly, do not realize the problem that full fiberize, stability of a system difference etc. exist at present, the object of the present invention is to provide a kind of new technological approaches, realize pulse duration and adjustable repetitive frequency is humorous, the time jitter of pulse train and amplitude jitter is very little, the passive Q-adjusted nanosecond pulse optical fiber laser of system stability, have that system's chamber shape is simple, cost is low, volume is little, advantages such as in light weight, good heat dissipation, full fiberize.
In order to achieve the above object, the technical solution used in the present invention is:
The present invention includes pumping source, wavelength division multiplexer, gain fibre, fiber optic splitter, optical fiber circulator, fiber grating, glass bushing, GRIN Lens, saturable absorber, speculum, fibre optic isolater.Described loop configuration nanosecond pulse optical fiber laser mainly adopts four kinds of cavity shape structures.
Described first kind of ring cavity structure is: the input welding of the tail optical fiber of pumping source and wavelength division multiplexer, for wavelength division multiplexer provides pump light, as input pumping light; The output of wavelength division multiplexer is connected with an end of gain fibre, is used for the pumping laser input gain optical fiber of pumping source is produced laser gain, and this gain fibre is as the gain media of laser; The other end of gain fibre is connected with the input of fiber optic splitter, and fiber optic splitter is divided into two bundles with light; First output of fiber optic splitter is exported the adjustable Q laser pulse in the annular chamber, and second output of fiber optic splitter connects first end of optical fiber circulator, thereby a part of laser is stayed in the annular chamber; Second end of optical fiber circulator is connected with an end of fiber grating, and the function of fiber grating is the selection of adjustable Q laser pulse centre wavelength, and realizes the steady operation of Q-switched laser; Optical fiber in the optical fiber of optical fiber circulator the 3rd end and first glass bushing, one end is connected, one end of the other end of first glass bushing and first GRIN Lens is bonding, make laser enter first GRIN Lens through first glass bushing, first GRIN Lens collimates to laser and focuses on; One end of the bonding saturable absorber of the other end of first GRIN Lens, saturable absorber is transferred the Q effect to laser; One end of bonding second GRIN Lens of the other end of saturable absorber carries out collimation and focusing again to laser; One end of the second GRIN Lens other end and second glass bushing is bonding, and laser is exported through second glass bushing; The fused fiber splice of the optical fiber of the second glass bushing other end and wavelength division multiplexer signal end, thus constitute an annular chamber complete, unidirectional concussion.
Described second kind of ring cavity structure is: the input welding of the tail optical fiber of pumping source and wavelength division multiplexer, for wavelength division multiplexer provides pump light, as input pumping light; The output of wavelength division multiplexer is connected with an end of gain fibre, is used for the pumping laser input gain optical fiber of pumping source is produced laser gain, and this gain fibre is as the gain media of laser; The other end of gain fibre is connected with the input of fiber optic splitter, and fiber optic splitter is divided into two bundles with light; An output of fiber optic splitter is exported the adjustable Q laser pulse in the annular chamber, and second output of fiber optic splitter connects first end of optical fiber circulator, thereby a part of laser is stayed in the annular chamber; Optical fiber in the optical fiber of second end of optical fiber circulator and first glass bushing, one end is connected, one end of the other end of first glass bushing and first GRIN Lens is bonding, make laser enter first GRIN Lens through first glass bushing, first GRIN Lens collimates to laser and focuses on; One end of the bonding saturable absorber of the other end of first GRIN Lens, saturable absorber is transferred the Q effect to laser; Bonding second GRIN Lens of the other end of saturable absorber is carried out collimation and focusing again to laser; One end of the bonding speculum of the second GRIN Lens other end is returned the laser mirroring that is reflected, and speculum can guarantee the steady running of laser annular chamber.The 3rd end of optical fiber circulator and the signal end welding of wavelength division multiplexer, thus constitute an annular chamber complete, unidirectional concussion.
Described the third ring cavity structure is: the input welding of the tail optical fiber of pumping source and wavelength division multiplexer, for wavelength division multiplexer provides pump light, as input pumping light; The output of wavelength division multiplexer is connected with an end of gain fibre, is used for the pumping laser input gain optical fiber of pumping source is produced laser gain, and this gain fibre is as the gain media of laser; The other end of gain fibre is connected with the input of fiber optic splitter, and fiber optic splitter is divided into two bundles with light; First output of fiber optic splitter is exported the adjustable Q laser pulse in the annular chamber, and second output of fiber optic splitter connects first end of optical fiber circulator, thereby a part of laser is stayed in the annular chamber; Optical fiber in the optical fiber of second end of optical fiber circulator and first glass bushing, one end is connected, one end of the other end of first glass bushing and first GRIN Lens is bonding, make laser enter first GRIN Lens through first glass bushing, first GRIN Lens collimates to laser and focuses on; One end of the bonding saturable absorber of the other end of first GRIN Lens, saturable absorber is transferred the Q effect to laser; The bonding speculum of the other end of saturable absorber is returned the laser mirroring that is reflected, and speculum can guarantee the steady running of laser annular chamber.The 3rd end of optical fiber circulator and the signal end welding of wavelength division multiplexer, thus constitute an annular chamber complete, unidirectional concussion.
Described the 4th kind of ring cavity structure is: the input welding of the tail optical fiber of pumping source and wavelength division multiplexer, for wavelength division multiplexer provides pump light, as input pumping light; The output of wavelength division multiplexer is connected with an end of gain fibre, is used for the pumping laser input gain optical fiber of pumping source is produced laser gain, and this gain fibre is as the gain media of laser; The other end of gain fibre is connected with the input of fiber optic splitter, and fiber optic splitter is divided into two bundles with light; First output of fiber optic splitter is exported the adjustable Q laser pulse in the annular chamber, second output of fiber optic splitter connects the input of fibre optic isolater, and the effect of fibre optic isolater is unidirectional, orderly, the stable concussion that realizes the annular chamber inner laser; Optical fiber in the optical fiber of fibre optic isolater output and first glass bushing, one end is connected, one end of the other end of first glass bushing and first GRIN Lens is bonding, make laser enter first GRIN Lens through first glass bushing, first GRIN Lens collimates to laser and focuses on; One end of the bonding saturable absorber of the other end of first GRIN Lens, saturable absorber is transferred the Q effect to laser; One end of bonding second GRIN Lens of the other end of saturable absorber, second GRIN Lens is carried out collimation and focusing again to laser; One end of the second GRIN Lens other end and second glass bushing is bonding, and laser is exported via second glass bushing; The optical fiber in the second glass bushing other end and the fused fiber splice of wavelength division multiplexer signal end, thus constitute an annular chamber complete, unidirectional concussion.
Described pumping source 1 is semiconductor laser, solid state laser, gas laser, fiber laser or Raman laser; Described gain fibre 3 is doped fiber or photonic crystal fiber; Described fiber grating 12 and speculum 13, reflectivity is greater than 50%.
Described first GRIN Lens 7 and second GRIN Lens 9, the scope of using wavelength X is: 100nm≤λ≤10000nm, the scope of intercept Z is: 0P≤Z≤1P, end face coating select coating single side, double-sided coating and one of three kinds of plated films not for use, and 0 °≤θ of end plane angle≤10 ° is optional.
Described saturable absorber 8 is selected the Cr:YAG saturable absorber for use; The scope of saturable absorber thickness d is: 0mm≤d≤5mm, transmitance T
0Scope be: 10%≤T
0≤ 99%.Compared with prior art, the present invention has the tangible advantage of following several respects:
1, the present invention bonds to glass bushing, GRIN Lens, saturable absorber together, constitute little accent Q components and parts, has realized that optical fiber transfers that Q's is integrated.These small-sized accent Q components and parts two ends can directly be fused in the fiber laser directly with optical fiber output, have realized the full fiberize of fiber laser, thereby have reduced other extraneous factors to passive Q-adjusted influence.
2, this loop configuration nanosecond pulse optical fiber laser, optical fiber circulator or isolator can effectively suppress the stimulated Brillouin scattering effect, thereby effectively reduced the ubiquitous jitter problem of passive Q-adjusted fiber laser, obtain stable, high repetition nanosecond laser pulses output, whole laser cavity is more stable, practicability and realized the tunable of pulse duration and repetition rate more.
3, the present invention adopts the passive Q-adjusted nanosecond pulse optical fiber laser of saturable absorber, has little, in light weight, the advantages such as cost is low, good heat dissipation of volume.Have wide practical use in fields such as laser processing, laser medicine, military affairs.
Description of drawings
First kind of cavity shape structure schematic diagram of a kind of loop configuration nanosecond pulse optical fiber laser that Fig. 1 provides for embodiment 1;
Second kind of cavity shape structure schematic diagram of a kind of loop configuration nanosecond pulse optical fiber laser that Fig. 2 provides for embodiment 2;
The third cavity shape structure schematic diagram of a kind of loop configuration nanosecond pulse optical fiber laser that Fig. 3 provides for embodiment 3;
The 4th kind of cavity shape structure schematic diagram of a kind of loop configuration nanosecond pulse optical fiber laser that Fig. 4 provides for embodiment 4;
Among the figure: 1, pumping source, 2, wavelength division multiplexer, 3, gain fibre, 4, fiber optic splitter, the output of 5 fiber optic splitters, 6, first glass bushing, 7, first GRIN Lens, 8, Cr:YAG saturable absorber, 9, second GRIN Lens, 10, second glass bushing, 11, optical fiber circulator, 12, fiber grating, 13, speculum, 14, fibre optic isolater.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described, but is not limited only to following several embodiment:
First kind of loop configuration nanosecond pulse optical fiber laser as shown in Figure 1.Among Fig. 1,1 is pumping source, selects for use maximum to bear power 10W, the semiconductor laser diode of centre wavelength 976nm; 2 is wavelength division multiplexer, and model is the pump light wavelength division multiplexer of (2+1); 3 is gain fibre, selects the long double clad Yb dosed optical fiber of 6m for use; 4 is fiber optic splitter, and splitting ratio is 2: 8; 5 is fiber optic splitter 20% output; 6 and 10 are respectively first glass bushing and second glass bushing, and optical fiber inserts in the glass bushing, make laser through glass bushing; 7 and 9 are respectively first GRIN Lens and second GRIN Lens, and the intercept Z=0.5P of this GRIN Lens adopts double-sided coating, and two end faces all are 8 ° of angles, and effect is to collimate and focus on entering laser in the glass bushing; 8 is the Cr:YAG saturable absorber, its diameter
Thickness 1=1.14mm, transmitance T
0=60%, effect is that fiber laser is transferred Q; 11 is optical fiber circulator, makes the rotation direction of endovenous laser have one-way, and reduces the interference from other factorses such as pulses; 12 is fiber grating, and the centre wavelength of fiber grating is 1064nm, reflectivity 99%;
Wherein, the pumping laser of semiconductor laser diode 976nm wavelength is coupled into the long gain fibre of 6m by (2+1) wavelength division multiplexer and produces laser gain.Laser is through fiber optic splitter, and the end with 20% carries out ps pulsed laser and ns pulsed laser output, and 80% laser is stayed in the annular chamber, produces laser generation, makes the running of annular chamber efficient stable.Laser enters first end of optical fiber circulator via an end of fiber optic splitter splitting ratio 80%, and laser arrives fiber grating through second port of optical fiber circulator, and the rate of being reflected is that 99% fiber grating reflects, and arrives the 3rd port of circulator.Laser is through the optical fiber in first glass bushing, collimated by first GRIN Lens and focus on, the Cr:YAG saturable absorber places between first GRIN Lens and second GRIN Lens as adjusting Q crystal, thereby fiber laser is transferred Q, obtain more stable ps pulsed laser and ns pulsed laser.Laser successively by second GRIN Lens and second glass bushing, enters the signal end of (2+1) wavelength division multiplexer, the looping chamber more at last.Total chamber of this annular chamber is about and is 10m.The foregoing description 1 is under the condition of pump power 2.664W, obtain power output 334mW, repetition rate 29.7KHz, the pulse train of pulse duration 900ns, the time jitter of prior art pulse train is all greater than 10% at present, and the time jitter of the foregoing description 1 pulse train and amplitude jitter be less than 10%, thereby improved the stability of system preferably.
Second kind of loop configuration nanosecond pulse optical fiber laser as shown in Figure 2.Among Fig. 2,1 is pumping source, selects for use maximum to bear power 10W, the semiconductor laser diode of centre wavelength 976nm; 2 is wavelength division multiplexer, and model is the pump light wavelength division multiplexer of (2+1); 3 is gain fibre, selects the long double clad Yb dosed optical fiber of 6m for use; 4 is fiber optic splitter, and splitting ratio is 2: 8; 5 is fiber optic splitter 20% output; 6 is first glass bushing, and optical fiber inserts in the glass bushing, makes laser pass through glass bushing; 7 and 9 are respectively first GRIN Lens and second GRIN Lens, and the intercept Z=0.5P of this GRIN Lens selects double-sided coating for use, and two end faces all are 8 ° of angles, and effect is to collimate and focus on entering laser in the glass bushing; 8 is the Cr:YAG saturable absorber, its diameter
Thickness 1=2.15mm, transmitance T
0=55%, effect is that fiber laser is transferred Q; 11 is optical fiber circulator, makes the rotation direction of endovenous laser have one-way, and reduces the interference from other factorses such as pulses; 13 is speculum, reflectivity 99%.
Wherein, the pumping laser of semiconductor laser diode 976nm wavelength is coupled into the long gain fibre of 6m by (2+1) wavelength division multiplexer and produces laser gain.Laser is through fiber optic splitter, and the end with 20% carries out ps pulsed laser and ns pulsed laser output, and 80% laser is stayed in the annular chamber, produces laser generation, makes the running of annular chamber efficient stable.Laser enters first end of optical fiber circulator via an end of fiber optic splitter reflectivity 80%, laser is through second port of optical fiber circulator and by first glass bushing, by first GRIN Lens collimation and focusing, the Cr:YAG saturable absorber is as adjusting Q crystal, place between first GRIN Lens and second GRIN Lens, thereby fiber laser is transferred Q, obtain more stable ps pulsed laser and ns pulsed laser.Laser is again by second GRIN Lens, and the rate of being reflected is that 99% mirror reflects is returned, and arrives the 3rd port of circulator.Enter the signal end of (2+1) wavelength division multiplexer at last, the looping chamber.Total chamber of this annular chamber is about and is 10m.The foregoing description 2 is under the condition of pump power 2.664W, obtain power output 240.9mW, repetition rate 37.64KHz, the pulse train of pulse duration 920ns, the time jitter of prior art pulse train is all greater than 10% at present, and the time jitter of the foregoing description 2 pulse trains and amplitude jitter be less than 10%, thereby improved the stability of system preferably.
The third loop configuration nanosecond pulse optical fiber laser as shown in Figure 3.Among Fig. 3,1 is pumping source, selects for use maximum to bear power 10W, the semiconductor laser diode of centre wavelength 976nm; 2 is wavelength division multiplexer, and model is the pump light wavelength division multiplexer of (2+1); 3 is gain fibre, selects the long double clad Yb dosed optical fiber of 6m for use; 4 is fiber optic splitter, and splitting ratio is 2: 8; 5 is fiber optic splitter 20% output; 6 is first glass bushing, and optical fiber inserts in the glass bushing, makes laser pass through glass bushing; 7 is first GRIN Lens, and the intercept Z=0.5P of this GRIN Lens selects double-sided coating for use, and two end faces all are 8 ° of angles, and effect is to collimate and focus on entering laser in the glass bushing; 8 is the Cr:YAG saturable absorber, its diameter
Thickness 1=2.13mm, transmitance T
0=70%, effect is that fiber laser is transferred Q; 11 is optical fiber circulator, makes the rotation direction of endovenous laser have one-way, and reduces the interference from other factorses such as pulses; 13 is speculum, reflectivity 99%.
Wherein, the pumping laser of semiconductor laser diode 976nm wavelength is coupled into the long gain fibre of 6m by (2+1) wavelength division multiplexer and produces laser gain.Laser is through fiber optic splitter, and the end with 20% carries out ps pulsed laser and ns pulsed laser output, and 80% laser is stayed in the annular chamber, produces laser generation, makes the running of annular chamber efficient stable.Laser enters first end of optical fiber circulator via an end of fiber optic splitter reflectivity 80%, laser is through second port of optical fiber circulator and by first glass bushing, by first GRIN Lens collimation and focusing, the Cr:YAG saturable absorber is as adjusting Q crystal, fiber laser is transferred Q, obtain more stable ps pulsed laser and ns pulsed laser.The laser rate of being reflected again is that 99% mirror reflects is returned, and arrives the 3rd port of circulator.Enter the signal end of (2+1) wavelength division multiplexer at last, the looping chamber.Total chamber of this annular chamber is about and is 10m.The foregoing description 3 is under the condition of pump power 2.664W, obtain power output 235.8mW, repetition rate 29KHz, the pulse train of pulse duration 952ns, the time jitter of prior art pulse train is all greater than 10% at present, and the time jitter of the foregoing description 3 pulse trains and amplitude jitter be less than 10%, thereby improved the stability of system preferably.
First kind of nanosecond pulse optical fiber laser ring cavity structure as shown in Figure 4.Among Fig. 4,1 is pumping source, selects for use maximum to bear power 10W, the semiconductor laser diode of centre wavelength 976nm; 2 is wavelength division multiplexer, and model is the pump light wavelength division multiplexer of (2+1); 3 is gain fibre, selects the long double clad Yb dosed optical fiber of 6m for use; 4 is fiber optic splitter, and splitting ratio is 2: 8; 5 is fiber optic splitter 20% output; 6 and 10 are respectively first glass bushing and second glass bushing, and optical fiber inserts in the glass bushing, makes laser pass through glass bushing; 7 and 9 are respectively first GRIN Lens and second GRIN Lens, and the intercept Z=0.25P of this GRIN Lens selects double-sided coating for use, and two end faces all are 8 ° of angles, and effect is to collimate and focus on entering laser in the glass bushing; 8 is the Cr:YAG saturable absorber, its diameter
Thickness 1=1.32mm, transmitance T
0=47%, effect is that fiber laser is transferred Q; 14 is fibre optic isolater, makes the rotation direction of endovenous laser have one-way, and reduces the interference from other factorses such as pulses;
Wherein, the pumping laser of semiconductor laser diode 976nm wavelength is coupled into the long gain fibre of 6m by (2+1) wavelength division multiplexer and produces laser gain.Laser is through fiber optic splitter, and the end with 20% carries out ps pulsed laser and ns pulsed laser output, and 80% laser is stayed in the annular chamber, produces laser generation, makes the running of annular chamber efficient stable.Laser enters the input of fibre optic isolater via an end of fiber optic splitter reflectivity 80%, laser arrives the interior optical fiber of first glass bushing through the output of fibre optic isolater, collimated by first GRIN Lens and focus on, the Cr:YAG saturable absorber is as adjusting Q crystal, place between first GRIN Lens and second GRIN Lens, thereby fiber laser is transferred Q, obtain more stable ps pulsed laser and ns pulsed laser.Laser successively by second GRIN Lens and second glass bushing, enters the signal end of (2+1) wavelength division multiplexer, the looping chamber more at last.Total chamber of this annular chamber is about and is 10m.The foregoing description 4 is under the condition of pump power 2.664W, obtain power output 246.3mW, repetition rate 38.5KHz, the pulse train of pulse duration 976ns, the time jitter of prior art pulse train is all greater than 10% at present, and the time jitter of the foregoing description 4 pulse trains and amplitude jitter be less than 10%, thereby improved the stability of system preferably.
Claims (4)
1. a loop configuration nanosecond pulse optical fiber laser is characterized in that: the output (5), first glass bushing (6), first GRIN Lens (7), the saturable absorber (8) that comprise pumping source (1), wavelength division multiplexer (2), gain fibre (3), fiber optic splitter (4), fiber optic splitter;
Described first kind of ring cavity structure also comprised second GRIN Lens (9), second glass bushing (10), optical fiber circulator (11) and fiber grating (12), its concrete structure is: the input welding of the tail optical fiber of a pumping source (1) and wavelength division multiplexer (2), one end welding of the output of wavelength division multiplexer (2) and gain fibre (3), the input welding of the other end of gain fibre (3) and fiber optic splitter (4), first output (5) output laser of fiber optic splitter, second output of fiber optic splitter (4) and the first end welding of optical fiber circulator (11), one end welding of second end of optical fiber circulator (11) and fiber grating (12), fused fiber splice in the 3rd end of optical fiber circulator and first glass bushing (6) one ends, one end of bonding first GRIN Lens of the other end of first glass bushing (6) (7), one end of the bonding saturable absorber of the other end (8) of first GRIN Lens (7), one end of bonding second GRIN Lens of the other end of saturable absorber (8) (9), one end of bonding second glass bushing of the other end of second GRIN Lens (9) (10), the optical fiber in second glass bushing (10) other end and the fused fiber splice of wavelength division multiplexer (2) signal end, thereby looping chamber;
Described second kind of ring cavity structure also comprised second GRIN Lens (9), optical fiber circulator (11) and speculum (13), its concrete structure is: the input welding of the tail optical fiber of a pumping source (1) and wavelength division multiplexer (2), one end welding of the output of wavelength division multiplexer (2) and gain fibre (3), the input welding of the other end of gain fibre (3) and fiber optic splitter (4), first output (5) output laser of fiber optic splitter, second output of fiber optic splitter (4) and the first end welding of optical fiber circulator (11), fused fiber splice in second end of optical fiber circulator (11) and first glass bushing (6) one ends, one end of bonding first GRIN Lens of the other end of first glass bushing (6) (7), one end of the bonding saturable absorber of the other end (8) of first GRIN Lens (7), one end of bonding second GRIN Lens of the other end of saturable absorber (9), the other end of second GRIN Lens (9) is connected with an end of speculum (13), the fused fiber splice of the 3rd end of optical fiber circulator (11) and wavelength division multiplexer (2) signal end, thereby looping chamber;
Described the third ring cavity structure has also comprised optical fiber circulator (11) and speculum (13), its concrete structure is: the input welding of the tail optical fiber of a pumping source (1) and wavelength division multiplexer (2), one end welding of the output of wavelength division multiplexer (2) and gain fibre (3), the input welding of the other end of gain fibre (3) and fiber optic splitter (4), first output (5) output laser of fiber optic splitter, second output of fiber optic splitter (4) and the first end welding of optical fiber circulator (11), fused fiber splice in second end of optical fiber circulator (11) and first glass bushing (6) one ends, one end of bonding first GRIN Lens of the other end of first glass bushing (6) (7), one end of the bonding saturable absorber of the other end (8) of first GRIN Lens (7), one end of the bonding speculum of the other end of saturable absorber (13), the fused fiber splice of the 3rd end of optical fiber circulator (11) and wavelength division multiplexer (2) signal end, thereby looping chamber;
Described the 4th kind of ring cavity structure also comprised second GRIN Lens (9), second glass bushing (10) and fibre optic isolater (14), its concrete structure is: the input welding of the tail optical fiber of a pumping source (1) and wavelength division multiplexer (2), one end welding of the output of wavelength division multiplexer (2) and gain fibre (3), the input welding of the other end of gain fibre (3) and fiber optic splitter (4), first output (5) output laser of fiber optic splitter, second output of fiber optic splitter (4) and the input welding of fibre optic isolater (14), fused fiber splice in the output of fibre optic isolater (14) and first glass bushing (6) one ends, one end of bonding first GRIN Lens of the other end of first glass bushing (6) (7), the bonding saturable absorber of the other end (8) of first GRIN Lens (7), one end of bonding second GRIN Lens of the other end of saturable absorber (8) (9), one end of bonding second glass bushing of the other end of second GRIN Lens (11) (10), the optical fiber in second glass bushing (10) other end and the fused fiber splice of wavelength division multiplexer (2) signal end, thereby looping chamber.
2. a kind of loop configuration nanosecond pulse optical fiber laser according to claim 1 is characterized in that: described pumping source (1) is semiconductor laser, solid state laser, gas laser, fiber laser or Raman laser; Described gain fibre (3) is doped fiber or photonic crystal fiber; Described fiber grating (12) and speculum (13), reflectivity is greater than 50%.
3. a kind of loop configuration nanosecond pulse optical fiber laser according to claim 1, it is characterized in that: described first GRIN Lens (7) and second GRIN Lens (9), the scope of using wavelength X is: 100nm≤λ≤10000nm, the scope of intercept Z is: 0P≤Z≤1P, end face coating is selected coating single side, double-sided coating and one of three kinds of plated films not for use, and 0 °≤θ of end plane angle≤10 ° is optional.
4. a kind of loop configuration nanosecond pulse optical fiber laser according to claim 1 is characterized in that: described saturable absorber (8), select the Cr:YAG saturable absorber for use; The scope of saturable absorber thickness d is: 0mm≤d≤5mm, transmitance T
0Scope be: 10%≤T
0≤ 99%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103618208A (en) * | 2013-12-05 | 2014-03-05 | 聊城大学 | Mini-type integrated nanosecond pulse laser module coupled through optical fiber |
| CN105229875A (en) * | 2013-03-21 | 2016-01-06 | 二极管激光器激光线发展与销售有限公司 | Laser assembly |
| CN105811228A (en) * | 2016-05-30 | 2016-07-27 | 中国科学院半导体研究所 | Highly-doped broad-spectrum erbium-ytterbium co-doped superfluorescent fiber source integrated device |
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| 《Optics Express》 20070122 J.Y.Huang et al. High power passively Q-switched ytterbium fiber laser with Cr4+:YAG as a saturable absorber 第15卷, 第2期 * |
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| CN102570269A (en) * | 2012-01-18 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Annular backward pumping structure of high-power all-fiber laser |
| CN105229875A (en) * | 2013-03-21 | 2016-01-06 | 二极管激光器激光线发展与销售有限公司 | Laser assembly |
| CN103618208A (en) * | 2013-12-05 | 2014-03-05 | 聊城大学 | Mini-type integrated nanosecond pulse laser module coupled through optical fiber |
| CN103618208B (en) * | 2013-12-05 | 2016-08-17 | 聊城大学 | A kind of micro integrated ps pulsed laser and ns pulsed laser module of optical fiber coupling |
| CN105811228A (en) * | 2016-05-30 | 2016-07-27 | 中国科学院半导体研究所 | Highly-doped broad-spectrum erbium-ytterbium co-doped superfluorescent fiber source integrated device |
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