CN101465513B - Bistable Tm,Ho:YLE laser with bistable zone and adjustable width - Google Patents
Bistable Tm,Ho:YLE laser with bistable zone and adjustable width Download PDFInfo
- Publication number
- CN101465513B CN101465513B CN2009100712467A CN200910071246A CN101465513B CN 101465513 B CN101465513 B CN 101465513B CN 2009100712467 A CN2009100712467 A CN 2009100712467A CN 200910071246 A CN200910071246 A CN 200910071246A CN 101465513 B CN101465513 B CN 101465513B
- Authority
- CN
- China
- Prior art keywords
- laser
- bistable
- pumping source
- ylf
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention provides an optical bistable Tm, Ho:YLF laser, the width of pumping bistable area of a laser diode end surface of which can be adjusted; the optical bistable Tm, Ho:YLF laser comprises a laser diode pumping source, an optical fiber, a coupling lens, a resonant cavity and a thulium and holmium codoping lithium yttrium fluoride crystal; the optical bistable Tm, Ho:YLF laser is characterized in that: pumping light given off by the two laser diode pumping sources enters in the resonant cavity by respectively passing through the optical fiber and the coupling lens; the resonant cavity is an L-shaped right-angle folding cavity which is composed of a back-cavity mirror, a 45 degrees plane folding mirror and an output mirror; the front end of the resonant cavity is the back-cavity mirror, the rear end thereof is the 45 degrees plane folding mirror, and the lower end thereof is the output mirror; the thulium and holmium codoping lithium yttrium fluoride crystal is arranged in theresonant cavity. The laser has small volume, simple structure and low cost; by injecting pumping light to an absorption area, the absorption performance of the absorption area is changed, thus achieving the purpose of adjusting the width of the bistable area and leading the laser to have large adjusting magnitude and convenient usage.
Description
(1) technical field
The present invention relates to laser technology field, specifically is a kind of adjusting optical bistable Tm, the method for Ho:YLF laser bistable sector width.
(2) background technology
Optical bistability is a kind of new nonlinear optical phenomena of finding after laser produces 15 years.The laser bistable state is meant corresponding two stable power outputs under same pump power, gets which power output and depends on that pump power arrives the mode (be to be increased to this value, still be reduced to this value) of respective point.The laser optics bistable has important application in fields such as optical logic device, optical switch, optical communication and optical storage.Produce the bistable method of laser and be generally in laserresonator, also will add dispersive medium or saturable absorber in addition, cause the complex structure of laser, and the bistable sector width of laser is difficult to control except having the gain media.
Nearly room temperature, Tm
3+With Ho
3+Mix the laser crystal three level system that is as the criterion altogether, exist comparatively significantly ground state to the reabsorption of 2 μ m photons, because the effect of transfer process and excited state absorption on the energy delivery, non-linear saturated phenomenon can appear in the heavily absorption of this ground state.In the process that pump power increases,, make that the pump light intensities of nearly pumping end surface is higher because the non-homogeneous absorption characteristic of single end face pump has caused the non-uniform Distribution of last energy level particle along optical axis direction.At the threshold value place, the heavy pumping district of nearly pumping end surface has realized the population upset, is gain region; And the weak pumping area of pumping end surface far away is not realized the population upset being the uptake zone, can regard saturable absorption as.Because the population density of last energy level is big more, the effect of conversion and excited state absorption is obvious all the more on the energy delivery, thereby cause energy level useful life reduce also obvious all the more, therefore in the process that pump power increases, at the threshold pump power place, gain region has higher saturated light intensity than the uptake zone, in case produce laser generation, the absorption of uptake zone is easier to be saturated.Just because of Tm, there is said process in the Ho:YLF laser crystal, has caused Tm, the bistable output of Ho:YLF laser, and do not need to add in addition saturable absorption in the chamber.In increasing the process of pump power, when pump power was lower than threshold pump power, laser was in off state, and number of photons seldom in this moment chamber.Because the ground state reabsorption of the non-area of popular inversion (to the uptake zone of 2 μ m photons) of laser crystal, cause laser to be in high loss state, therefore along with the increase of pump power, the population density of energy level increases thereupon on the laser crystal, cause on the energy delivery influence of conversion and excited state absorption effect more remarkable, thereby make the threshold value of pump power further increase.In case draw power reaches threshold value, the laser starting oscillation, number of photons sharply increases in the chamber.Because the re-absorbed saturation of laser crystal ground state, loss moment of laser transfers low-loss to by high loss, cause the further increase of endovenous laser light intensity conversely, reach new balance up to gain and loss, laser has been realized stable output, has therefore occurred in high threshold place power output a transition amount by a relatively large margin being arranged.When laser is in light state, because 2 μ m laser are to Tm, the re-absorbed saturation of Ho:YLF laser crystal ground state causes laser cavity to be in the low-loss state; Simultaneously, conversion and excited state absorption process have been suppressed on the energy delivery in the stimulated radiation of 2 μ m laser, therefore, when laser is in light state, pump power in the process that reduces, lower pumping threshold of correspondence during the laser failure of oscillations.The Tm of laser diode end-face pump like this, the Ho:YLF laser has been realized bistable output.If with another bundle pump light control Tm, the absorption characteristic of Ho:YLF laser crystal uptake zone just can realize effective control of laser bistable sector width.
(3) summary of the invention
The object of the present invention is to provide a kind of adjusting optical bistable Tm, the method for Ho:YLF laser bistable sector width.
The laser of realizing this method comprises that laser diode pumping source, optical fiber, coupled lens, resonant cavity, thulium holmium mix lithium yttrium fluoride (Tm, Ho:YLF) crystal altogether; Described laser diode pumping source is two, and the pump light that two laser diode pumping sources send enters in the resonant cavity through optical fiber and coupled lens respectively; The L shaped right angle fold chamber that described resonant cavity is made up of Effect of Back-Cavity Mirror, the flat-folded mirror of 45 and outgoing mirror, front end is an Effect of Back-Cavity Mirror, and the rear end is the 45 plane mirror, and the lower end is an outgoing mirror, places the thulium holmium in the resonant cavity and mixes the lithium yttrium fluoride crystal altogether; The thulium holmium is mixed the lithium yttrium fluoride crystal on side face altogether and is wrapped to sandwich with indium foil and have in light hole copper heat sink, heat sink temperature is by the accurate control of high accuracy temperature controller, the hot side of thermoelectric module touches with the metal derby close proximity that has pipeline in heat sink, pipeline in the metal derby continues by recirculated cooling water, is used for taking away the heat that refrigeration produces.
The present invention can also comprise some features like this:
1, the output wavelength of described laser diode pumping source is 792nm.
2, described thulium holmium is mixed a direction of principal axis of cut direction for defining along physics of lithium yttrium fluoride crystal altogether.
3, described thulium holmium two end faces mixing the lithium yttrium fluoride crystal altogether all are coated with the anti-reflection film of light to wavelength 792nm and 2.06 μ m.
4, to be coated with to the anti-reflection film of the pump light of wavelength 792nm with to wavelength be the high anti-film of light of 2.06 μ m to the flat-folded mirror of described Effect of Back-Cavity Mirror and 45.
5, the adjustable optical bistable Tm of described laser diode end-face pump bistable sector width, the Ho:YLF laser is characterized in that described outgoing mirror is that the transmitance of the light of 2.06 μ m is 1%-10% to wavelength.
6, described thulium holmium is mixed lithium yttrium fluoride Tm altogether, and end pumping is carried out by two 792nm laser diode pumping sources respectively in the two ends of Ho:YLF crystal, and one of them pumping source is mainly used in the absorbent properties of control saturated absorption.
7, the output wavelength of described laser is 2.06 μ m.
Among the present invention, first pumping source is mainly laser crystal pump energy is provided, because the non-homogeneous absorption characteristic of end pumping makes that the pump light intensities of nearly pumping end surface is higher, has caused the non-uniform Distribution of last energy level particle along optical axis direction, at the threshold value place, the heavy pumping district of nearly pumping end surface has realized population inversion, is gain region, and population inversion is not realized in the weak pumping area of pumping end surface far away, be the uptake zone, can regard saturable absorption as; Second pumping source output smaller power is mainly used in the absorbent properties that change the laser crystal uptake zone, reaches the purpose of regulating the bistable sector width.
It is zero that the present invention at first makes the power output of first pumping source, and the power output of second pumping source is zero.Be that the power output of transferring big first pumping source gradually has laser output until the outgoing mirror end under zero the prerequisite in the power output that keeps second pumping source; If this moment, the power output of first pumping source was P
On, progressively reduce the power output of first pumping source then, be zero until the power output of laser outgoing mirror, the power output of establishing first pumping source this moment is P
OffThe width in optical bistable district then is Δ P
1=P
On-P
OffNext, increase the power output of 1: second pumping source, repeat said process, the bistable sector width that records is Δ P
2Δ P is arranged
1＞Δ P
2At last, the power output of first pumping source and second pumping source increases synchronously and reduces, and the optical bistable phenomenon disappears.
The invention provides a kind of adjusting optical bistable Tm, the method of Ho:YLF laser bistable sector width, Tm, the Ho:YLF laser crystal is not only done gain media but also do saturable absorption, the laser that separates than laser medium and saturable absorption lacks has used a crystal, so the volume of this laser is littler, structure is simple more, cost is lower; And by injecting the absorbent properties that pump light changes the uptake zone, reach the purpose of regulating the bistable sector width, make that the amplitude of accommodation of the present invention is big to the uptake zone, easy to use.
(4) description of drawings
Fig. 1 is a laser light path structural representation of the present invention.
Fig. 2 is the optical bistability phenomenon lab diagram among the present invention.
Fig. 3 is that the power output of first pumping source and second pumping source among the present invention increases the lab diagram that optical bistability disappears when reducing synchronously then synchronously.
(5) embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1, this enforcement comprises: laser diode first pumping source 1, optical fiber 2, coupled lens 3, Effect of Back-Cavity Mirror 4, mix lithium yttrium fluoride Tm altogether, Ho:YLF crystal 5, the flat-folded mirror 6 of 45, outgoing mirror 7, coupled lens 8, optical fiber 9, laser diode second pumping source 10 along a axle cutting thulium holmium.The pump light that two laser diode pumping sources 1,10 send enters in the resonant cavity through optical fiber 2,9 and coupled lens 3,8 respectively; The L shaped right angle fold chamber that described resonant cavity is made up of Effect of Back-Cavity Mirror 4, the flat-folded mirror 6 of 45 and outgoing mirror 7, front end is an Effect of Back-Cavity Mirror 4, and the rear end is a 45 plane mirror 6, and the lower end is an outgoing mirror 7, places the thulium holmium in the resonant cavity and mixes the lithium yttrium fluoride crystal 5 altogether.
The output wavelength of described laser diode pumping source is 792nm.
Described thulium holmium is mixed lithium yttrium fluoride Tm altogether, and the cut direction of Ho:YLF crystal is a direction of principal axis along the physics definition, and this crystal is not only done gain medium but also do saturated absorption that produces optical bistable, and the doping content of this crystal is 6%Tm
3+, 0.4%Ho
3+
Described thulium holmium is mixed lithium yttrium fluoride Tm altogether, and two end faces of Ho:YLF crystal all are coated with the anti-reflection film of light to wavelength 792nm and 2.06 μ m.
It is the high anti-film of light of 2.06 μ m that the flat-folded mirror of described Effect of Back-Cavity Mirror and 45 is coated with to the anti-reflection film of the pump light of wavelength 792nm with to wavelength.
Described outgoing mirror is that the transmitance of the light of 2.06 μ m is 3% to wavelength.
Described thulium holmium is mixed lithium yttrium fluoride Tm altogether, and end pumping is carried out by two 792nm laser diode pumping sources respectively in the two ends of Ho:YLF crystal, and one of them pumping source is mainly used in the absorbent properties of control saturated absorption.
The output wavelength of described laser is 2.06 μ m.
In the present embodiment, first pumping source 1 is mixed lithium yttrium fluoride Tm altogether for the thulium holmium, the Ho:YLF crystal 5 provides pump energy, because the non-homogeneous absorption characteristic of single end face pump, make that the pump light intensities of nearly pumping end surface is higher, caused the non-uniform Distribution of last energy level particle along optical axis direction, at the pumping threshold place, the heavy pumping district of nearly pumping end surface has realized population inversion, is gain region, and population inversion is not realized in the weak pumping area of pumping end surface far away, be the uptake zone, can regard saturable absorption as, therefore can select for use a thulium holmium to mix lithium yttrium fluoride Tm altogether, the Ho:YLF crystal is not only done gain media but also do saturable absorption.Second pumping source 10 is mainly used in the non-linear absorption performance that changes the laser crystal uptake zone, reaches the purpose of control bistable sector width.
Present embodiment is regulated the size of the power output of first pumping source 1 when the power output of second pumping source 10 is set to zero, when the power output of first pumping source was increased to 3.7W, this power was called turn on pump Pu threshold value, and there is laser output at outgoing mirror 7 places.And then the power output of first pumping source turned down, when the power output of first pumping source dropped to 3.1W, this power was called the pass pumping threshold, and the laser output at outgoing mirror 7 places just stops.When the power output of first pumping source was some values between 3.1W and the 3.7W, this laser had two laser output valves at outgoing mirror 7 places, and this phenomenon promptly is the optical bistable phenomenon of solid state laser.When the power output of second pumping source is zero, the relation curve of outgoing mirror 7 place's output power of laser and the first pumping source pump power as shown in Figure 2, the width in bistable district is a turn on pump Pu threshold value and the difference of pass pumping threshold is 0.6W.When second pumping source 10 has less power output, repeat above-mentioned experimentation, find that the laser bistable sector width at outgoing mirror 7 places reduces to some extent, and the optical bistable sector width reduce with the increase of second pumping source, 10 power outputs obvious all the more.When the power output of first pumping source 1 and second pumping source 10 increased synchronously and reduces, there was not the optical bistable phenomenon visible this moment in outgoing mirror 7 place's output power of laser with the variation relation curve of two pumping source power output sums as shown in Figure 3.
Claims (3)
1. regulate optical bistable Tm for one kind, the method of Ho:YLF laser bistable sector width, described optical bistable Tm, the Ho:YLF laser comprises first and second laser diode pumping sources (1,10), optical fiber (2,9), coupled lens (3,8), Tm, Ho:YLF laser crystal (5), and by Effect of Back-Cavity Mirror (4), the L shaped right angle fold chamber that flat-folded mirror of 45 (6) and outgoing mirror (7) are formed, wherein first pumping source (1) is used to realize the bistable output of laser, second pumping source (10) is used to change the absorbent properties of laser crystal uptake zone, and described control method may further comprise the steps:
(1) under the power output of second laser diode pumping source (10) is zero prerequisite, increase the power output of first laser diode pumping source (1) earlier to turn on pump Pu threshold value, and then be reduced to the pass pumping threshold, realize Tm, the optical bistable output of Ho:YLF laser 2.06 mum wavelengths;
(2) when second laser diode pumping source (10) has less power output, repeating step (1) is realized reducing of laser bistable sector width; Increase the power output of second laser diode pumping source (10) gradually, the optical bistable sector width continues to reduce thereupon.
2. according to the described a kind of adjusting optical bistable Tm of claim 1, the method of Ho:YLF laser bistable sector width, it is characterized in that: first laser diode pumping source (1) is Tm, and the Ho:YLF laser crystal provides pump energy, realizes the bistable output of laser 2.06 μ m laser.
3. according to the described a kind of adjusting optical bistable Tm of claim 1, the method of Ho:YLF laser bistable sector width, it is characterized in that: second laser diode pumping source (10) is to Tm, the uptake zone of Ho:YLF laser crystal injects pump light, change the absorption characteristic of laser crystal uptake zone, realize the adjusting of optical bistable sector width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100712467A CN101465513B (en) | 2009-01-09 | 2009-01-09 | Bistable Tm,Ho:YLE laser with bistable zone and adjustable width |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100712467A CN101465513B (en) | 2009-01-09 | 2009-01-09 | Bistable Tm,Ho:YLE laser with bistable zone and adjustable width |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101465513A CN101465513A (en) | 2009-06-24 |
| CN101465513B true CN101465513B (en) | 2010-12-01 |
Family
ID=40805937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100712467A Expired - Fee Related CN101465513B (en) | 2009-01-09 | 2009-01-09 | Bistable Tm,Ho:YLE laser with bistable zone and adjustable width |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101465513B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856785A (en) * | 2012-09-06 | 2013-01-02 | 中国电子科技集团公司第十一研究所 | End face and side face composite pumping device and laser |
| CN102842849A (en) * | 2012-09-19 | 2012-12-26 | 哈尔滨工业大学 | High power 3 mum -5mum wave band solid laser of optical fiber laser pump |
| CN103050881B (en) * | 2012-09-25 | 2015-08-26 | 武汉立德激光有限公司 | The YAG green laser of the semiconductor double-end pumping of high pulse peak power high repetition frequency |
| CN103219642A (en) * | 2013-04-19 | 2013-07-24 | 哈尔滨工业大学 | Hectowatt-level 2-micrometer solid laser generating device at room temperature |
| US10537965B2 (en) | 2013-12-13 | 2020-01-21 | Applied Materials, Inc. | Fiber array line generator |
| CN103779775B (en) * | 2013-12-27 | 2014-12-10 | 中国科学院理化技术研究所 | Thulium-and-holmium-doped laser, laser gain medium and wavelength regulating method |
| CN104099665B (en) * | 2014-07-09 | 2017-12-15 | 北京雷生强式科技有限责任公司 | A kind of lithium yttrium fluoride composite crystal and preparation method thereof |
| CN104409957B (en) * | 2014-11-07 | 2018-04-27 | 中国船舶重工集团公司第七一七研究所 | A kind of 2 μm of laser devices of narrow linewidth |
| CN104577686B (en) * | 2015-01-04 | 2017-10-20 | 中国科学院上海光学精密机械研究所 | Optical-fiber laser both-end pumping Ho3+The mu m waveband laser device of laser crystal 1.19 |
| CN106877121B (en) * | 2017-04-19 | 2019-10-25 | 重庆大学 | Pulse width tuning laser based on light-operated graphene Chirp Bragg grating |
| CN113258424B (en) * | 2021-05-11 | 2022-09-27 | 天津工业大学 | Dual-wavelength pulse synchronous Tm, Ho, LLF passive Q-switched solid laser |
-
2009
- 2009-01-09 CN CN2009100712467A patent/CN101465513B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101465513A (en) | 2009-06-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101465513B (en) | Bistable Tm,Ho:YLE laser with bistable zone and adjustable width | |
| Chen et al. | Optimization of fiber-coupled laser-diode end-pumped lasers: influence of pump-beam quality | |
| CN202695968U (en) | Passive Q-switched laser based on bonded crystal | |
| CN202513435U (en) | High-energy high-repetition-frequency full-optical-fiber laser with master oscillator power amplifier (MOPA) structure | |
| CN103618205B (en) | A kind of full-solid-state single longitudinal mode yellow light laser | |
| CN106911060B (en) | The high-efficiency high power mid-infrared laser device of Wavelength tunable | |
| CN104934843A (en) | All-fiber intermediate infrared high-energy passively Q-switched fiber laser | |
| CN103779775A (en) | Thulium-and-holmium-doped laser, laser gain medium and wavelength regulating method | |
| CN105790052A (en) | Method of improving mid-infrared supercontinuum light source slope efficiency and output power | |
| Chen et al. | Efficient continuous-wave and passively Q-switched pulse laser operations in a diffusion-bonded sapphire/Er: Yb: YAl 3 (BO 3) 4/sapphire composite crystal around 1.55 μm | |
| CN208368938U (en) | A kind of Q-switched laser of semiconductor laser pumping | |
| CN103825188B (en) | The adjustable high power picosecond laser of output frequency | |
| CN113594842A (en) | Device and method for generating ultrashort pulse of erbium-doped laser | |
| CN100527547C (en) | Tunable thulium-doped optical fiber laser | |
| Choudhary et al. | Ion-exchanged Tm 3+: glass channel waveguide laser | |
| Xu et al. | A 6.5 ns gain-switched electro-optical Q-switched Nd: YAG laser by 885 nm laser diode pulsed-end pumping | |
| CN208045932U (en) | A kind of mode locked fiber laser | |
| CN203387045U (en) | Optical fiber end-pumped laser | |
| CN202957448U (en) | Middle and far-infrared super-continuum spectrum fiber laser | |
| CN105490139A (en) | High-power all-fiber near and middle infrared super-continuum spectrum laser light source | |
| CN201210579Y (en) | Tunable thulium doped optical fiber laser | |
| CN103779770A (en) | Blue-light LD pimping praseodymium-doped yttrium lithium fluoride 915 nm near-infrared total-solid laser device | |
| CN203800376U (en) | High-power picosecond laser device with adjustable output frequency | |
| CN209150479U (en) | The solid state laser of one micron waveband | |
| CN107887784B (en) | A kind of nanosecond pulse optical fiber laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20180109 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |