CN109818252A - Transverse pump laser - Google Patents
Transverse pump laser Download PDFInfo
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- CN109818252A CN109818252A CN201711170190.1A CN201711170190A CN109818252A CN 109818252 A CN109818252 A CN 109818252A CN 201711170190 A CN201711170190 A CN 201711170190A CN 109818252 A CN109818252 A CN 109818252A
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- laser
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Abstract
A kind of transverse pump laser, including pumping source, laser gain medium resonant cavity, the laser gain medium is located in the resonant cavity, the pump light that pumping source issues carries out transverse pump from the side incidence of the laser gain medium, particle beams reversion is generated under laser gain medium effect, and oscillation forms laser in the resonant cavity, is emitted perpendicular to the pump light incident direction；The laser gain medium is the II-VI group crystal of the containing transition metal prepared by high-temperature diffusion method.Pump light can effectively be focused on using transverse pump scheme by the higher region of transition metal ions concentration, to realize more efficient laser output.
Description
Technical field
The present invention relates to solid mid-infrared laser technical fields, and in particular to a kind of transverse pump laser.
Background technique
3~5 μm of mid-infrared lasers are in propagation in atmosphere window, in many civilian necks such as spectroscopy, remote sensing, medical treatment, environmental protection
There is important application prospect in domain.In military field, mid-infrared laser is in biochemical war agent detection, laser ranging, photoelectronic warfare etc.
Aspect also has important application.Currently, realizing that the technological approaches of mid-infrared laser output mainly has quanta cascaded semiconductor laser
Device and the nonlinear optical conversion technology (including OPO and DFG technology) for using complexity.The transition metal (TM) occurred in recent years is mixed
3~6 μm of direct lasings may be implemented in miscellaneous II-VI group crystal laser technology, infrared solid in such relative to indirect pump scheme
Body laser is more simple and compact in principle design and laser structure.Such transition metal (TM) adulterates II-VI group crystal
Preparation method can complete doping using making transition metal ions enter II-VI group crystal by High temperature diffusion, be easy to make in this way
It is high at transition metal ions concentration near plane of crystal, and almost nil obvious of germ nucleus region transfers concentration of metal ions
Concentration gradient.
Wherein, with Fe2+: for ZnSe laser, because it has apparent advantage in terms of material property and transfer efficiency,
Become the mid-infrared laser source of great prospect.Fe2+: ZnSe laser first in 1999 by Adams et al. in cryogenic conditions
Fe is realized under (15-180K)2+: the pulse laser output of ZnSe monocrystalline, and realize the wavelength in 3.98~4.54 μ ms
Tuning.Fe2+The Absorption and emission spectra reflected in the form of section-wavelength in host material ZnSe is as shown in Figure 1.Fe2+:
ZnSe absorption of crystal section peak value 0.97 × 10-18cm2Near 3 μm, emission cross section peak value 1.4 × 10-18cm2Positioned at 4.3 μm
Near.Using the 3.3mm thickness Fe of typical double surface thermal diffusion method preparations2+: the Fe of ZnSe crystal2+Ion concentration distribution situation is such as
Shown in Fig. 2.
The Fe that disclosure is reported both at home and abroad at present2+: ZnSe mid-infrared laser device is all using longitudinally pumped scheme, comprising:
(1) longitudinally perpendicular incident pump, i.e. pump light optical axis and Fe2+: ZnSe laser beam axis is parallel, firstly, since Fe2+:
The pump light of ZnSe laser is near 3 μm, output laser 4.3 μm nearby be respectively positioned in infrared band, the plating of dichroic mirror
Film difficulty is larger, brings very big difficulty to application；Secondly as carrying out Fe to ZnSe crystal2+When doping, near plane of crystal
Fe2+Ion concentration is high, germ nucleus region Fe2+Ion concentration is almost nil, using crystal central region when longitudinally pumped scheme
Existing photon can not be amplified, instead since the absorption of crystal consumes partial photonic, efficient excitation can not be formed, then
It is secondary, limitation of the longitudinally pumped scheme due to thermal diffusivity, thermal lensing effect easy to form, and be easy when pump energy density is excessive
Crystal is damaged, therefore, the pump energy of longitudinally pumped scheme cannot be too big, also limits laser output energy.
(2) longitudinal low-angle oblique incidence pumping, i.e. pump light optical axis and Fe2+: ZnSe laser beam axis at a slight angle, reduces
The coupling efficiency of pump light.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of transverse pump lasers, at least partly solve
At least one of certainly above-mentioned the technical issues of referring to.
To achieve the above object, technical scheme is as follows:
A kind of transverse pump laser, including pumping source, laser gain medium resonant cavity, in which:
The laser gain medium is located in the resonant cavity, and the pump light that pumping source issues is from the laser gain medium
Side incidence carry out transverse pump, particle beams reversion is generated under laser gain medium effect, and in the resonant cavity
Middle concussion forms laser and is emitted perpendicular to the pump light incident direction；The laser gain medium is to be prepared by high-temperature diffusion method
Containing transition metal II-VI group crystal.
Preferably, the II-VI group crystal of the containing transition metal is selected from Fe2+: ZnSe crystal, Cr2+: ZnSe crystal, Ni2 +: ZnS crystal or Cr2+: CdSe crystal.
Preferably, the transverse pump laser further includes beam shaping focusing unit, the pumping that the pumping source issues
It is big with the main doped region side of the laser gain medium to form one after the beam shaping focusing unit shaping, focusing for light
Small comparable hot spot from laser gain medium described in the side vertical incidence and focuses on the main lateral pump of doped region surface progress
Pu.
Preferably, the beam shaping focusing unit includes for the diaphragm to pumping light shaping and for focusing
Lens, the lens are preferably cylindrical lens.
Preferably, focussed collimated unit is additionally provided between the diaphragm and the cylindrical lens.
Preferably, the side of the laser gain medium is coated with the anti-reflection film to pump light, opposite with the side
Another side be coated with the high-reflecting film to pump light.
Preferably, the resonant cavity includes the output coupling to output laser Gao Fanqian resonant reflec-tors and for exporting laser
Mirror, the preceding resonant reflec-tors and output coupling mirror are located at the two sides of the laser gain medium, and the preceding resonant reflec-tors, output
The working face of coupling mirror and laser gain medium is all perpendicular to resonator optical axis direction.
Preferably, the preceding resonant reflec-tors are concave mirror, and the output coupling mirror is plane output coupling mirror.
Based on the above-mentioned technical proposal, the beneficial effects of the present invention are:
A, when due to carrying out doped transition metal ions to II-VI group crystal, nearby transition metal ions is dense for plane of crystal
Degree is high, and germ nucleus region transfers concentration of metal ions is lower, can effectively be focused on pump light using transverse pump scheme
Fe2+The higher region of ion concentration, to realize more efficient laser output.
B, transverse pump scheme provides biggish heat dissipation area, reduces thermal lensing effect to Fe2+: ZnSe laser beam
Influence.
C, since crystal is there are certain damage threshold, transverse pump scheme can be such that crystal holds compared to longitudinally pumped scheme
By higher pump energy, to improve the output energy of laser.
D, transverse pump scheme can reduce the requirement to hysteroscope plated film, be conducive to relative to longitudinally perpendicular incident scheme
Project Realization.
Detailed description of the invention
Fig. 1 is Fe2+The Absorption and emission spectra figure reflected in the form of section-wavelength in host material ZnSe；
Fig. 2 is the Fe of typical double surface thermal diffusion method preparations2+: the Fe of ZnSe crystal2+Ion concentration distribution situation map；
Fig. 3 is the transverse pump Fe of one embodiment of the invention2+: ZnSe laser structure schematic diagram.
Wherein, 1, diaphragm；2, cylindrical lens；3,Fe2+: ZnSe crystal；4, preceding resonant reflec-tors；5, output coupling mirror；
6, laser emitting direction.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
As a specific embodiment, transverse pump Fe of the invention2+: ZnSe laser structure is as shown in figure 3, include pumping
Source, beam shaping focusing unit, Fe2+: ZnSe crystal, resonant cavity composition.
Pumping source is 3 mu m waveband narrow spaces laser sources, for emitting pump light.
The laser that beam shaping focusing unit is used to issue pumping source carries out shaping and focusing, including 1 He of diaphragm
Cylindrical lens 2.Diaphragm 1 is also convenient to change pump energy other than for pump spot shaping.Cylindrical lens 2
For by pump light be focused into the comparable hot spot of crystal high-doped zone lateral area, improve the absorptivity and Fe of pump light2+Ion
Effective firing rate.
Beam shaping focusing unit, can be in the two when the pump light angle of divergence is excessive in addition to diaphragm and cylindrical lens
Between increase focussed collimated unit and improve beam quality.
Resonant cavity includes preceding resonant reflec-tors 4 and output coupling mirror 5.Wherein, preceding resonant reflec-tors are high to Output of laser wavelength anti-.
Output coupling mirror has certain transmitance to Output of laser wavelength.In the present embodiment, preceding resonant reflec-tors can be anti-for concave surface
Mirror is penetrated, output coupling mirror can be plane output coupling mirror.Certainly, preceding resonant reflec-tors and output coupling mirror are not limited to this reality
The structure of example is applied, such as preceding resonant reflec-tors and output coupling mirror can all be plane mirror or concave mirror, as long as can be realized phase
Answer the cavity resonator structure of function.
Pumping source issues pump light through diaphragm, then through cylindrical lens focus strip hot spot (size of hot spot with
The lateral area of the main doped region of crystal is suitable), from Fe2+: 3 side vertical incidence of ZnSe crystal focuses on Fe2+: ZnSe crystal 3
Main doped region surface, to Fe2+: ZnSe crystal 3 is pumped.The laser gain medium Fe2+: ZnSe crystal 3 generates population
Reversion generates laser under the feedback effect for the resonant cavity that the preceding resonant reflec-tors and output coupling mirror are constituted, along laser emitting
Direction 6 is exported through the output coupling mirror.Laser resonator optical axis direction is vertical with pump direction, and with preceding resonant reflec-tors,
Output coupling mirror and Fe2+: 3 working face of ZnSe crystal is vertical.Fe2+: 3 two sides of ZnSe crystal are parallel to each other, and receive pump light
Side plate anti-reflection film, another side plate high-reflecting film, the pump light not absorbed once can be made to turn again in crystal and joined
With pumping.
Transverse pump scheme of the invention is in addition to being applied to Fe2+: except ZnSe crystal, it may also be used for pumping is expanded using high temperature
Other transition metal (TM) of arching pushing preparation adulterate II-VI group crystal, such as Cr2+: ZnSe, Ni2+: ZnS, Cr2+: CdSe etc. is generated
Efficient mid-infrared laser.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (8)
1. a kind of transverse pump laser, including pumping source, laser gain medium resonant cavity, in which:
The laser gain medium is located in the resonant cavity, and the pump light that pumping source issues is from the side of the laser gain medium
Face incidence carries out transverse pump, particle beams reversion is generated under laser gain medium effect, and shake in the resonant cavity
It swings and to form laser and be emitted perpendicular to the pump light incident direction；
It is characterized in that, the laser gain medium is the II-VI group crystal of the containing transition metal prepared by high-temperature diffusion method.
2. transverse pump laser according to claim 1, which is characterized in that the II-VI group of the containing transition metal
Crystal is selected from Fe2+: ZnSe crystal, Cr2+: ZnSe crystal, Ni2+: ZnS crystal or Cr2+: CdSe crystal.
3. transverse pump laser according to claim 1, which is characterized in that the transverse pump laser further includes light
Beam shaping focusing unit, the pump light that the pumping source issues form one after the beam shaping focusing unit shaping, focusing
With the main sizable hot spot in doped region side of the laser gain medium, from laser gain described in the side vertical incidence
Medium simultaneously focuses on main doped region surface progress transverse pump.
4. transverse pump laser according to claim 3, which is characterized in that the beam shaping focusing unit includes using
In the diaphragm to pumping light shaping and for the lens of focusing, the lens are preferably cylindrical lens.
5. transverse pump laser according to claim 4, which is characterized in that the diaphragm and the cylindrical lens
Between be additionally provided with focussed collimated unit.
6. transverse pump laser according to claim 1, which is characterized in that the side of the laser gain medium
It is coated with the anti-reflection film to pump light, the another side opposite with the side is coated with the high-reflecting film to pump light.
7. transverse pump laser according to claim 1, which is characterized in that the resonant cavity includes high to output laser
Resonant reflec-tors and the output coupling mirror for exporting laser, the preceding resonant reflec-tors and output coupling mirror are located at the laser before anti-
The two sides of gain media, and the working face of the preceding resonant reflec-tors, output coupling mirror and laser gain medium is all perpendicular to described
Resonator optical axis direction.
8. transverse pump laser according to claim 7, which is characterized in that the preceding resonant reflec-tors are concave reflection
Mirror, the output coupling mirror are plane output coupling mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711170190.1A CN109818252A (en) | 2017-11-21 | 2017-11-21 | Transverse pump laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711170190.1A CN109818252A (en) | 2017-11-21 | 2017-11-21 | Transverse pump laser |
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| CN109818252A true CN109818252A (en) | 2019-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165535A (en) * | 2019-07-18 | 2019-08-23 | 南京南智先进光电集成技术研究院有限公司 | A kind of optical parametric oscillator of profile pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6167069A (en) * | 1998-05-01 | 2000-12-26 | The Regents Of The University Of California | Thermal lens elimination by gradient-reduced zone coupling of optical beams |
| US20070060917A1 (en) * | 2002-06-21 | 2007-03-15 | Biolase Technology, Inc. | High-efficiency, side-pumped diode laser system |
| US20130121353A1 (en) * | 2011-11-14 | 2013-05-16 | Francis J. Kub | Infrared laser |
| CN105388618A (en) * | 2015-12-15 | 2016-03-09 | 哈尔滨工业大学 | Multidimensional sheet-shape light beam shaping adjusting device and method for laser spectrum technology |
-
2017
- 2017-11-21 CN CN201711170190.1A patent/CN109818252A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6167069A (en) * | 1998-05-01 | 2000-12-26 | The Regents Of The University Of California | Thermal lens elimination by gradient-reduced zone coupling of optical beams |
| US20070060917A1 (en) * | 2002-06-21 | 2007-03-15 | Biolase Technology, Inc. | High-efficiency, side-pumped diode laser system |
| US20130121353A1 (en) * | 2011-11-14 | 2013-05-16 | Francis J. Kub | Infrared laser |
| CN105388618A (en) * | 2015-12-15 | 2016-03-09 | 哈尔滨工业大学 | Multidimensional sheet-shape light beam shaping adjusting device and method for laser spectrum technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165535A (en) * | 2019-07-18 | 2019-08-23 | 南京南智先进光电集成技术研究院有限公司 | A kind of optical parametric oscillator of profile pump |
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