CN102544986B - Pump coaxiality adjusting method for double-end-face pump laser device - Google Patents
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Abstract
The invention discloses a pump coaxiality adjusting method for a double-end-face pump laser device, which includes steps: a, inputting pump laser from the tail end of a first pump laser transmission optical fiber and measuring output power from the tail end of a second pump laser transmission optical fiber; b, adjusting the position of a first pump reshaping lens group until the output power measured from the tail end of the second pump laser transmission optical fiber is the maximum; c, inputting pump laser from the tail end of the second pump laser transmission optical fiber and measuring the output power from the tail end of the first pump laser transmission optical fiber; d, adjusting the position of a second pump reshaping lens group until the output power measured from the tail end of the first pump laser transmission optical fiber is the maximum; and e, repeating steps from a to d until both the output power measured from the tail end of the first pump laser transmission optical fiber and the output power measured from the tail end of the second pump laser transmission optical fiber reach the maximum.
Description
Technical field
The invention relates to a kind of pumping axiality control method of double-end pumping laser aid, particularly about a kind of simple and reliable double-end pumping laser or the pumping axiality control method of laser amplifier.
Background technology
Since the nineties in 20th century, the development of end face pumping all-solid-state laser is maked rapid progress, and becomes the research focus of international and domestic laser technology.According to the size of laser diode and array Output optical power thereof and the characteristics of output beam, end pumping (vertically pumping) and profile pump (laterally pumping) dual mode are arranged usually.End pumping is middle low power LD light-pumped solid state laser a kind of pump mode commonly used.Has compact conformation, whole efficiency height, the characteristics that spatial model is good.In the end face pumping all-solid-state laser, the space coherent beam of LD output, along the axial pumping of optical resonator, light beam focuses in the small size of gain media.The parameter of resonant cavity guarantees that the space that excites of pump light resonant cavity mould can overlap well, reaches pattern matching, therefore can obtain extraordinary laser beam quality.Simultaneously, end pumping is very big in the penetration of incident direction, and gain media absorbs fully pump light, thereby pumping threshold power is low, and tiltedly efficient is higher.
Please refer to Fig. 1, shown in Fig. 1 is a kind of traditional single end face pump laser.The single end face pump laser comprises a pumping source (not shown), a pumping laser Transmission Fibers 1, a pumping shaping lens group 2, an Effect of Back-Cavity Mirror 3, a laser crystal 4 and an outgoing mirror 5.One end of pumping laser Transmission Fibers 1 connects pumping source, and the other end connects pumping shaping lens group 2.The pumping laser 6 that sends from pumping source passes through the end face that pumping laser Transmission Fibers 1, pumping shaping lens group 2 and Effect of Back-Cavity Mirror 3 are input to laser crystal 4 successively, through after the vibration of resonant cavity, be oscillating laser 7 from another end face outgoing of laser crystal 4, finally from outgoing mirror 5 outgoing.In the light path other optical elements can also be set, for example adjusting Q crystal etc.In order to reach the pattern matching condition, when the single end face pump laser is debug, except adjusting Effect of Back-Cavity Mirror 3 and outgoing mirror 5 that will be meticulous, also need to regulate the position of pumping set of lenses 2, so that pumping laser 6 and oscillating laser 7 reach best coincidence status.
In addition, publication number is that 200510005309.0 denominations of invention also disclose existing single end face pump laser for " active and passive Q-adjusted single longitudinal mode laser " for the CN101132108A denomination of invention for Chinese invention patent Shen Qing Publication specification, the patent No. of " semiconductor pumping high repeated frequency solid state laser device ".
Yet, because the existence of the thermal effect of crystal, the thermal stress that produced by the thermal effect in the crystal can not surpass the restriction of the fracture strength of laser crystal, exist the Maximum pumping can not be very high on the gain media unit are, too high pump power will cause the damage of crystal, therefore the single end face pump laser can only obtain lower laser output power usually, and consequent thermal lensing effect had a strong impact on the beam quality of laser, and the stability of long-time running simultaneously also can be subjected to very big influence.This makes single end face pump be subjected to certain restriction in practical laser is used.
In order further to improve the power output of end-pumped laser, double-end pumping laser application and giving birth to.Please refer to Fig. 2, shown in Fig. 2 is a kind of traditional double-end pumping laser 10.Double-end pumping laser 10 comprises first a pumping source (not shown), second a pumping source (not shown), first a pumping laser Transmission Fibers 11, second a pumping laser Transmission Fibers 17, first a pumping shaping lens group 12, second a pumping shaping lens group 16, first a chamber mirror 18, second a chamber mirror 19, an Effect of Back-Cavity Mirror 110, an outgoing mirror 111 and a laser crystal 112.The first chamber mirror 18, the second chamber mirror 19, Effect of Back-Cavity Mirror 110 and outgoing mirror 111 are formed resonant cavity.One end of the first pumping laser Transmission Fibers 11 connects this first pumping source, and the other end is connected to the first pumping shaping lens group 12.One end of the second pumping laser Transmission Fibers 17 connects this second pumping source, and the other end is connected to the second pumping shaping lens group 16.The first pumping laser Transmission Fibers 11 is used for the pumping laser 13 that first pumping source produces is coupled to the first pumping shaping lens group 12, the first pumping shaping lens group 12 is used for this pumping laser 13 collimations are focused on, and this pumping laser 13 is input to an end face of laser crystal 112 after through the first chamber mirror 18.The second pumping laser Transmission Fibers 17 is used for the pumping laser 15 that second pumping source produces is coupled to the second pumping shaping lens group 16, the second pumping shaping lens group 16 is used for this pumping laser 15 collimations are focused on, and this pumping laser 15 is input to another end face of laser crystal 112 after through the second chamber mirror 19.
Because pumping laser 13, the 15th, inject respectively from two end faces of laser crystal 112, therefore the pump power that allows in the limit range of end face loss threshold value of crystal is doubled than single end face pump is whole, so double-end pumping laser power output when keeping good mode quality can significantly improve.
With respect to the single end face pump laser, the double-end pumping laser is in order to reach the pattern matching condition, structure is very complicated, it is also cumbersome regulate: not only will regulate the first pumping shaping lens group 12 and the second pumping shaping lens group 16 and make pumping laser 13 and 15 with beyond oscillating laser 14 overlaps, it is strict coaxial also to need to regulate pumping laser 13 and pumping laser 15, so just best pattern matching be can reach, best beam quality and the highest output laser power obtained.Common way is: respectively the first pumping shaping lens group 12 and the second pumping shaping lens group 16 are installed on the five times regualting frame, power and the facular model of the laser of monitoring output in real time, online two pumping set of lenses 12,16 five the dimension degree of freedom and former and later two chamber mirrors 110 and 111 adjusted respectively, reach optimum state simultaneously up to laser power and facular model, fix five dimension adjustment racks then.The link that such debug process need be regulated is very many, and whole debug process is very loaded down with trivial details, spend a large amount of time.And since must be when being the laser bright dipping on-line debugging, be easy to cause the damage of laser crystal.
Summary of the invention
For solve prior art double-end pumping laser pumping axiality control method comparatively loaded down with trivial details, damage the problem of laser crystal easily, the invention provides a kind of comparatively simple and be not easy to damage the pumping axiality control method of the double-end pumping laser aid of laser crystal.
Technical scheme of the present invention is:
A kind of pumping axiality control method of double-end pumping laser aid, described double-end pumping laser aid comprises the first pumping laser Transmission Fibers, the first pumping shaping lens group, the second pumping shaping lens group and the second pumping laser Transmission Fibers that arranges in regular turn, it is characterized in that this method comprises the following steps:
A. import pumping laser from the tail end of the first pumping laser Transmission Fibers, this pumping laser is exported from the second pumping laser Transmission Fibers after the first pumping shaping lens group, the second pumping shaping lens group successively, measures power output from the tail end of the second pumping laser Transmission Fibers;
B. regulate the position of the first pumping shaping lens group, the power output maximum that measures up to the tail end from the second pumping laser Transmission Fibers;
C. import pumping laser from the tail end of the second pumping laser Transmission Fibers, this pumping laser is exported from the first pumping laser Transmission Fibers after the second pumping shaping lens group, the first pumping shaping lens group successively, measures power output from the tail end of the first pumping laser Transmission Fibers;
D. regulate the position of the second pumping shaping lens group, the power output maximum that measures up to the tail end from the first pumping laser Transmission Fibers;
E. repeating step a is to steps d, up to all reaching maximum from the tail end of the first pumping laser Transmission Fibers with from the power output that the tail end of the second pumping laser Transmission Fibers measures.
In an embodiment of the invention, described step a also comprises: regulate the position of the described second pumping shaping lens group, make that measuring laser output power from an end of the second pumping laser Transmission Fibers is non-zero values.
In an embodiment of the invention, described step c also comprises: regulate the position of the described first pumping shaping lens group, make that measuring laser output power from an end of the first pumping laser Transmission Fibers is non-zero values.
In an embodiment of the invention, described pumping laser uses pump diode to produce.
In an embodiment of the invention, described measurement power output is to use laser power meter to measure.
In an embodiment of the invention, the head end of the described first pumping laser Transmission Fibers is coupled to the described first pumping shaping lens group, and the head end of the described second pumping laser Transmission Fibers is coupled to the described second pumping shaping lens group.
In an embodiment of the invention, the resonant cavity with laser crystal is set between the first pumping shaping lens group of described double-end pumping laser aid and the second pumping shaping lens group.
In an embodiment of the invention, described resonant cavity comprises first a chamber mirror, second a chamber mirror, an Effect of Back-Cavity Mirror and an outgoing mirror, the described first chamber mirror is between an end face of the first pumping shaping lens group and described laser crystal, the described second chamber mirror is between another end face of the second pumping shaping lens group and described laser crystal, described Effect of Back-Cavity Mirror is on the reflected light path of the described first chamber mirror, and described outgoing mirror is on the reflected light path of the described second chamber mirror.
The pumping axiality control method of double-end pumping laser aid of the present invention need not on-line debugging, thereby can avoid damaging laser crystal.And control method of the present invention is simple, easily operation and saving debug time.
Description of drawings
Fig. 1 is a kind of structural representation of traditional single end face pump laser.
Fig. 2 is a kind of structural representation of traditional double-end pumping laser.
Fig. 3 is the structural representation of the double-end pumping laser aid regulated of axiality control method preferred embodiments of the present invention.
Fig. 4 is the flow chart of the axiality control method preferred embodiments of double-end pumping laser aid of the present invention.
Embodiment
Introduce a kind of preferred embodiments of the pumping axiality control method of double-end pumping laser aid of the present invention below.
Please refer to Fig. 3, shown in Fig. 3 is the double-end pumping laser aid 20 that axiality control method preferred embodiments of the present invention is regulated.Double-end pumping laser 20 comprises first a pumping laser Transmission Fibers 21, second a pumping laser Transmission Fibers 27, first a pumping shaping lens group 22, the second pumping shaping lens group 26, a resonant cavity (not label) and a laser crystal 212.Resonant cavity comprises first a chamber mirror 28, second a chamber mirror 29, an Effect of Back-Cavity Mirror 210 and an outgoing mirror 211.The first pumping laser Transmission Fibers 21 has a head end 214 and a tail end 216, head end 214 is coupled to the first pumping shaping lens group 22, tail end 216 is coupled to first pumping source when operate as normal, freely suspend in advance for the time being but regulate for follow-up axiality at present.The second pumping laser Transmission Fibers 27 has a head end 274 and a tail end 276, head end 274 is coupled to the second pumping shaping lens group 26, tail end 276 is coupled to second pumping source when operate as normal, freely suspend in advance for the time being but regulate for follow-up axiality at present.
The first chamber mirror 28 between first end face 2121 of the first pumping shaping lens group 22 and laser crystal 212, the second chamber mirror 29 the second pumping shaping lens group 26 and laser crystal 212 and first end face, 2121 second opposed end faces 2122 between.Effect of Back-Cavity Mirror 210 is on the reflected light path of the first chamber mirror 28, and outgoing mirror 211 is on the reflected light path of the second chamber mirror 29.
The pumping laser 23 that this first pumping source produced when the first pumping laser Transmission Fibers 21 was used for operate as normal is coupled to the first pumping shaping lens group 22, the first pumping shaping lens group 22 is used for this pumping laser 23 collimations are focused on, and this pumping laser 23 is input to first end face 2121 of laser crystal 212 after through the first chamber mirror 28.The pumping laser 25 that this second pumping source produced when the second pumping laser Transmission Fibers 27 was used for operate as normal is coupled to the second pumping shaping lens group 26, the second pumping shaping lens group 26 is used for this pumping laser 25 collimations are focused on, and this pumping laser 25 is input to second end face 2122 of laser crystal 212 after through the second chamber mirror 29.
Laser crystal 212 can be Nd:YV04, also can be crystal such as Nd:GdV04 or Nd:YLF.The left and right sides curvature of first, second pumping shaping lens group 22, each lens of 26 as required can be different.
Please in conjunction with reference Fig. 3 and Fig. 4, introduce the step of utilizing coaxiality adjusting method of the present invention to adjust double-end pumping laser aid 20 below.
Step a: from the tail end input pumping laser of the first pumping laser Transmission Fibers 21, measure power output from the tail end of the second pumping laser Transmission Fibers 27;
Step b: regulate the position of the first pumping shaping lens group 22, the power output maximum that measures up to the tail end from the second pumping laser Transmission Fibers 27;
In the present embodiment, the first pumping shaping lens group 22 is placed in five times regualting frame and carries out position adjustments, but can directly regulate with hand after the skilled operation usually.By the reading of monitoring laser power meter, optimize the position of regulating the first pumping shaping lens group 22, reach the highest reading up to power meter.The first pumping shaping lens group 22 is constantly approached the optimum position when regulating, power output can improve gradually, has arrived the later power output in optimum position and has reached maximum, continues to regulate power again and then can descend, therefore be easy to find optimum position, i.e. peak power place.
Step c: from the tail end input pumping laser of the second pumping laser Transmission Fibers 27, measure power output from the tail end of the first pumping laser Transmission Fibers 21;
Location swap with this pump diode and laser power meter, namely, tail end 276 in the second pumping laser Transmission Fibers 27 connects pump diode, monitors the power output of the first pumping laser Transmission Fibers 21 at the tail end 216 usefulness laser power meters of the first pumping laser Transmission Fibers 21.Regulate the position, top to bottom, left and right, front and rear of the first pumping shaping lens group 22, make pumping laser that pump diode sends can enter the first pumping laser Transmission Fibers 21 and from tail end 216 outputs by the first pumping shaping lens group 22 absorbing later remainder through laser crystal 212.
Steps d: regulate the position of the second pumping shaping lens group 26, the power output maximum that measures up to the tail end from the first pumping laser Transmission Fibers 21;
Be similar to step b, by the reading of monitoring laser power meter, optimize the position of regulating the second pumping shaping lens group 26, reach the highest reading up to power meter.
Step e: repeating step a is to steps d, up to all reaching maximum from the tail end of the first pumping laser Transmission Fibers 21 with from the power output that the tail end of the second pumping laser Transmission Fibers 27 measures.
By repeating step a repeatedly to steps d, finally make first, second pumping laser Transmission Fibers 21,27 tail ends 216,276 power output all reach high state, at this moment the pumping laser 25 in right side pumping laser 23 and left side has reached best coincidence status, fixes the first pumping shaping lens group 22 and the second pumping shaping lens group 26 respectively.
In addition, regulate Effect of Back-Cavity Mirror 210 and outgoing mirror 211 at last, laser just can obtain best output state.
It is worthy of note that the pumping axiality control method of double-end pumping laser aid of the present invention can not carry out, and resonant cavity and laser crystal 212 is installed and used behind to be regulated the finishing again when resonant cavity and laser crystal 212 also are installed.
The pumping axiality control method of double-end pumping laser aid of the present invention can be used for regulating double-end pumping laser, laser amplifier etc.
The double-end pumping laser aid that the pumping axiality control method of double-end pumping laser aid of the present invention is regulated can have multiple resonant cavity.
In sum, the pumping axiality control method of double-end pumping laser aid of the present invention need not on-line debugging, thereby can avoid damaging laser crystal.And control method of the present invention is simple, easily operation and saving debug time.
Above-mentioned embodiment has been described in realization in order to demonstrate the invention.But other variations of the present invention and modification are apparent for those skilled in the art, and any modification/variation in essence disclosed in this invention and basic principle scope or imitation conversion all belong to claim protection range of the present invention.
Claims (6)
1. the pumping axiality control method of a double-end pumping laser aid, described double-end pumping laser aid comprises the first pumping laser Transmission Fibers, the first pumping shaping lens group, the resonant cavity with laser crystal, the second pumping shaping lens group and the second pumping laser Transmission Fibers that arranges in regular turn, the head end of the described first pumping laser Transmission Fibers is coupled to the described first pumping shaping lens group, the head end of the described second pumping laser Transmission Fibers is coupled to the described second pumping shaping lens group, it is characterized in that this method comprises the following steps:
A. import pumping laser from the tail end of the first pumping laser Transmission Fibers, this pumping laser is exported from the second pumping laser Transmission Fibers after the first pumping shaping lens group, the second pumping shaping lens group successively, measures power output from the tail end of the second pumping laser Transmission Fibers;
B. regulate the position of the first pumping shaping lens group, the power output maximum that measures up to the tail end from the second pumping laser Transmission Fibers;
C. import pumping laser from the tail end of the second pumping laser Transmission Fibers, this pumping laser is exported from the first pumping laser Transmission Fibers after the second pumping shaping lens group, the first pumping shaping lens group successively, measures power output from the tail end of the first pumping laser Transmission Fibers;
D. regulate the position of the second pumping shaping lens group, the power output maximum that measures up to the tail end from the first pumping laser Transmission Fibers;
E. repeating step a is to steps d, up to all reaching maximum from the tail end of the first pumping laser Transmission Fibers with from the power output that the tail end of the second pumping laser Transmission Fibers measures.
2. method according to claim 1, it is characterized in that: described step a also comprises: regulate the position of the described second pumping shaping lens group, make that measuring laser output power from an end of the second pumping laser Transmission Fibers is non-zero values.
3. method according to claim 1, it is characterized in that: described step c also comprises: regulate the position of the described first pumping shaping lens group, make that measuring laser output power from an end of the first pumping laser Transmission Fibers is non-zero values.
4. method according to claim 1 is characterized in that: the generation of described pumping laser use pump diode.
5. method according to claim 1, it is characterized in that: described measurement power output is to use laser power meter to measure.
6. method according to claim 1, it is characterized in that: described resonant cavity comprises first a chamber mirror, second a chamber mirror, an Effect of Back-Cavity Mirror and an outgoing mirror, the described first chamber mirror is between an end face of the first pumping shaping lens group and described laser crystal, the described second chamber mirror is between another end face of the second pumping shaping lens group and described laser crystal, described Effect of Back-Cavity Mirror is on the reflected light path of the described first chamber mirror, and described outgoing mirror is on the reflected light path of the described second chamber mirror.
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| CN107357113B (en) * | 2017-07-20 | 2020-03-13 | 深圳大学 | Vortex ultrashort laser pulse amplification system and method |
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| US5781573A (en) * | 1996-12-05 | 1998-07-14 | Northrop Grumman Corporation | High power solid state laser and method of increasing power using same |
| CN1848559A (en) * | 2005-04-12 | 2006-10-18 | 深圳市大族激光科技股份有限公司 | Semiconductor double-end pumping solid laser |
| CN1905295A (en) * | 2005-07-29 | 2007-01-31 | 深圳市大族激光科技股份有限公司 | Semiconductor double end face pumping Nd:YV04 high power single-mode solid laser |
| CN101232148A (en) * | 2008-02-22 | 2008-07-30 | 苏州德龙激光有限公司 | Design method of semiconductor diode both-end pumping high power UV laser |
| CN101806579A (en) * | 2009-02-16 | 2010-08-18 | 华为技术有限公司 | Reflector position sampling and calibrating method and device and laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101270166B1 (en) * | 2006-01-17 | 2013-05-31 | 삼성전자주식회사 | Vertical external cavity surface emitting laser |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5781573A (en) * | 1996-12-05 | 1998-07-14 | Northrop Grumman Corporation | High power solid state laser and method of increasing power using same |
| CN1848559A (en) * | 2005-04-12 | 2006-10-18 | 深圳市大族激光科技股份有限公司 | Semiconductor double-end pumping solid laser |
| CN1905295A (en) * | 2005-07-29 | 2007-01-31 | 深圳市大族激光科技股份有限公司 | Semiconductor double end face pumping Nd:YV04 high power single-mode solid laser |
| CN101232148A (en) * | 2008-02-22 | 2008-07-30 | 苏州德龙激光有限公司 | Design method of semiconductor diode both-end pumping high power UV laser |
| CN101806579A (en) * | 2009-02-16 | 2010-08-18 | 华为技术有限公司 | Reflector position sampling and calibrating method and device and laser |
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Application publication date: 20120704 Assignee: Laser technology (Tianjin) Co., Ltd. Assignor: Beijing GK Laser Technology Co., Ltd. Contract record no.: 2015110000049 Denomination of invention: Pump coaxiality adjusting method for double-end-face pump laser device Granted publication date: 20130911 License type: Exclusive License Record date: 20151127 |
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