CN1118117C - Laser with constant cavity length - Google Patents
Laser with constant cavity length Download PDFInfo
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- CN1118117C CN1118117C CN99113783A CN99113783A CN1118117C CN 1118117 C CN1118117 C CN 1118117C CN 99113783 A CN99113783 A CN 99113783A CN 99113783 A CN99113783 A CN 99113783A CN 1118117 C CN1118117 C CN 1118117C
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- laser
- plate
- compensating
- cavity length
- constant
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 239000006096 absorbing agent Substances 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 7
- 239000000975 dye Substances 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract 3
- 239000000126 substance Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 4
- 239000002223 garnet Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
A laser with constant cavity length is composed of a laser resonant cavity consisting of coupled output cavity plate and total reflecting composite cavity plate, and the laser working substance in said resonant cavity. The composite total reflection cavity plate is a right-angled triangular light path formed by a beam splitter and two total reflection mirrors, and a composite mode locking element formed by a compensation element and a saturable absorption body is arranged on the light path between the two total reflection mirrors. The invention has the advantages that when the laser pulse width is changed, the cavity length of the laser resonant cavity is constant, and the long-term stable operation of the laser is kept. The laser pulse width can be easily changed.
Description
Technical field:
The present invention is a kind of laser of constant cavity length.
Background technology:
Straight cavate laser in the prior art, it is total reflection chamber plate that its oscillator adopts an end, the other end is that partial reflection chamber plate constitutes laserresonator.Be built-in with laser working medium at resonant cavity.In order to obtain short pulse, adopt mode-locking technique again, in laserresonator, increase the locked mode element, obtain the output of mode-locked laser bundle.This laser is adjusted the simple advantage except having, and maximum shortcoming is laser stability difference and malleable pulsewidth not.
Patent ZL89105465.0 provides, and a kind of " head-on collision pulse master-laser with active-passive lock mould " is near output coupling cavity plate one end the active mode locking element to be arranged in laserresonator.Total reflection chamber plate is a compound total reflection chamber plate.In the plate of compound total reflection chamber saturable absorber is arranged.This laser has output laser stabilization and laser beam pulsewidth tunable characteristic (having covered the scope of nanosecond to psec) on a large scale.But this laser changes pulse duration dependence change, and key element---saturable absorber is realized.Because saturable absorber is in the compound total reflection chamber plate that places in the laserresonator, therefore, the long change in chamber that causes laserresonator in case will change that pulse duration will change its saturable absorber (not only wanting job change, thereupon also changing thickness).Touch the element operating frequency with lock initiatively and be complementary for the chamber length with laserresonator is modified to, the chamber of readjusting laserresonator in the reasonable time of must passing through is long, therefore the speed that changes laser pulse width is restricted, and the advantage of " pulsewidth is adjustable on a large scale " also just can not get good performance.
Summary of the invention:
The laser that the purpose of this invention is to provide a kind of constant cavity length, when it can steady operation can guarantee that again laser pulse width changes on a large scale, the laserresonator constant cavity length.When changing laser pulse width, the chamber that need not readjust laserresonator is long.Can change laser pulse width quickly and easily, help practical application.
The laser of constant cavity length of the present invention comprises that an end is that output coupling cavity plate 1 constitutes laserresonator with the compound total reflection of other end chamber plate 8.Be built-in with working-laser material 3 at laserresonator.Between output coupling cavity plate 1 and working-laser material 3, an active mode locking element 2 is arranged.Wherein compound total reflection chamber plate 8 comprises the right-angled triangle light path that is made of beam-splitter 4, the first completely reflecting mirrors 5 and second completely reflecting mirror 7, is equipped with locked mode element 6 on the light path mid point of first completely reflecting mirror 5 and second completely reflecting mirror 7.Locked mode element 6 is the compound locked mode elements that are made of compensating element, 9 and saturable absorption overall 10.
The saturable absorption of said locked mode element 6 overall 10 comprises n piece saturable absorber A
1, A
2, A
3, A
4... A
nSaid compensating element, 9 contains n sheet compensating plate B
1, B
2, B
3, B
4... B
nN 〉=1 wherein.
N piece saturable absorber A in the above-mentioned saturable absorption overall 10
1, A
2, A
3, A
4... A
n, with the compensating plate B in the compensating element, 9
1, B
2, B
3, B
4... B
nCombine accordingly, be A
1+ B
1, A
2+ B
2, A
3+ B
3... A
n+ B
nAs shown in Figure 2.They are to be arranged in ring shape, or are arranged in in-line.In the time of the compound locked mode element that increases in the laserresonator as locked mode element 6, also just increase compensating element, 9 in the chamber, and, change the saturable absorber A in the locked mode element 6
1, A
2, A
3, A
4... A
nThe time compensating plate B in the laserresonator
1, B
2, B
3, B
4... B
nAlso change, compensating plate has compensated owing to change the change in optical path length that saturable absorber brought thereupon, makes the looked compensation and invariable of the chamber of laserresonator.Because of having kept the constant cavity length of laserresonator, guarantee that for good and all the electronic frequency of chamber length and active mode locking element is critically mated, thereby work is steady in a long-term.
Compensating plate B in the compound locked mode element provided by the invention
1, B
2, B
3, B
4... B
nProcess through accurate Calculation.Its optical thickness and saturable absorber A
1, A
2, A
3, A
4... A
nThe mutually corresponding and strict total optical thickness sum that keeps of optical thickness identical, all equal a certain steady state value, as Fig. 2.Compensating plate B
1, B
2, B
3, B
4... B
nOptical thickness t
1, t
2, t
3... t
nWith saturable absorber A
1, A
2, A
3, A
4... A
nOptical thickness d
1, d
2, d
3, d
4... d
nCorresponding mutually, meet rule
d
1+ t
1=d
2+ t
2=...=d
n+ t
n=M constant
All thickness compensating plate B
1, B
2, B
3, B
4... B
n, with saturable absorber A
1, A
2, A
3, A
4... A
nWhen being arranged in ring shape accordingly mutually, locked mode element 6 is a rotary type.Shown in Fig. 3-1.When being arranged in in-line mutually, locked mode element 6 is portable.Shown in Fig. 3-2.The locked mode element 6 that compound locked mode element constitutes is fixed in the plate 8 of compound total reflection chamber in the right-angled triangle light path between first completely reflecting mirror 5 and second completely reflecting mirror 7 midpoint (for the point that clashes) of light path as Fig. 4.
The compensating plate B of above-mentioned formation compensating element, 9
1, B
2, B
3, B
4... B
nConstitute by optical body.Constitute saturable absorber A
1, A
2, A
3, A
4... A
nConstitute by dyestuff, or constitute by crystal.Dyestuff such as dyestuff sheet, liquid dyes.In the crystal, as lithium fluoride crystal, garnet crystal etc.The structure of constant cavity length laser of the present invention is applicable to various active-passive locking mode lasers.Laser pulse width can change at any time, but the chamber length of laserresonator remains unchanged, and laser can stably be worked.This advantage is very beneficial for the needs of modern science.
Advantage of the present invention is to have added compound locked mode element in the laserresonator as locked mode element 6, when changing laser pulse width, though the saturable absorber A in the change locked mode element 6
1, A
2, A
3, A
4... A
n, still, also changed the compensating plate B in the compensating element, 9 simultaneously
1, B
2, B
3, B
4... B
n, make the long maintenance in chamber of laserresonator invariable, need not remake other correction.The quick switching that this just helps laser pulse width helps using and implementing.The stability of laser works no longer degenerates because of changing pulse duration.Laser is accomplished operation steady in a long-term.Improved the adaptability of laser.Make it be applicable to the highly difficult requirements of one's work of multiple subject.
Description of drawings:
Fig. 1 is the laser resonator structure schematic diagram of the laser of constant cavity length of the present invention.
The schematic diagram that Fig. 2 mates mutually for saturable absorption overall 10 in the locked mode element 6 in the laserresonator of the present invention and compensating element, 9.
Fig. 3 in the laserresonator of the present invention as the structural representation of the compound locked mode element of locked mode element 6.
Wherein:
Fig. 3-1 is the saturable absorber A in the saturable absorption overall 10
1, A
2, A
3, A
4... A
nWith compensating plate B
1, B
2, B
3, B
4... B
nCombine accordingly mutually, line up ring shape, locked mode element 6 is the schematic diagram of rotary type.
Fig. 3-2 is saturated absorbing body A
1, A
2, A
3, A
4... A
nWith compensating plate B
1, B
2, B
3, B
4... B
nCombine accordingly mutually, be arranged in in-line, locked mode element 6 is portable schematic diagram.
Fig. 4 is among the embodiment, and locked mode element 6 is a rotary type, places the schematic diagram of light path mid point between first speculum 5 and second speculum 7.
Embodiment:
The structure of the laserresonator of the laser of constant cavity length as shown in Figure 1.
Place the locked mode element 6 of light path mid point between first completely reflecting mirror 5 and second completely reflecting mirror 7, contain the quantity n=4 of saturable absorber in the saturable absorption overall 10, promptly saturable absorber is A
1, A
2, A
3, A
4The quantity that contains compensating plate in the corresponding compensating element, 9 also is n=4, and promptly compensating plate is B
1, B
2, B
3, B
4
Saturable absorber A in the present embodiment
1Constitute A by the dyestuff sheet
2Constitute A by liquid dyes
3Constitute A by the lithium fluoride crystal
4Constitute by garnet crystal.Their optical thickness is respectively d
1=0.1mm, d
2=6mm, d
3=20mm, d
4=15mm.
The compensating plate B of compensating element, 9 in the present embodiment
1, B
2, B
3, B
4Be that optical body (K9) constitutes.Their optical thickness is respectively t
1=19.9mm, t
2=14mm, t
3=0, t
4=5mm.
Above-mentioned saturable absorber A
1, A
2, A
3, A
4With compensating plate B
1, B
2, B
3, B
4Combine accordingly mutually, be A
1+ B
1, A
2+ B
2, A
3+ B
3, A
4+ B
4Be arranged in ring shape, then locked mode element 6 is a rotary type, as shown in Figure 4.Their optical thicknesses meet rule
d
1+t
1＝0.1mm+19.9mm＝20mm
d
2+t
2＝6mm+14mm＝20mm
d
3+t
3＝20mm+0mm＝20mm
d
4+t
4＝15mm+5mm＝20mm
Find out by above-mentioned four formulas and to be constant.
The locked mode element 6 of above-mentioned present embodiment places in the compound total reflection chamber plate 8 in the laserresonator, and when quick switching pulsewidth, it is 50MHZ that the chamber length of laserresonator remains 1.5 meters, the vibration electric freq of laserresonator.Laser can move steadily in the long term.
Claims (6)
1. the laser of a constant cavity length, comprise that an end is that output coupling cavity plate (1) is built-in with working-laser material (3) with the laserresonator that the compound total reflection of other end chamber plate (8) constitutes, between output coupling cavity plate (1) and working-laser material (3), active mode locking element (2) is arranged, wherein compound total reflection chamber plate (8) comprises by the beam-splitter (4) that places on the right angle, place the light path of the right-angled triangle that first completely reflecting mirror (5) on two acute angles and second completely reflecting mirror (7) constitute respectively, on the light path mid point between first completely reflecting mirror (5) and second completely reflecting mirror (7), be equipped with locked mode element (6), it is characterized in that said locked mode element (6) is the compound locked mode element that is made of compensating element, (9) and saturable absorption overall (10).
2. the laser of constant cavity length according to claim 1 is characterized in that the saturable absorption overall (10) in the said locked mode element (6) contains n piece saturable absorber A
1, A
2, A
3, A
4... A
n, said compensating element, (9) contains n sheet compensating plate B
1, B
2, B
3, B
4... B
n, 1≤n≤6 wherein.
3. the laser of constant cavity length according to claim 1 and 2 is characterized in that the compensating plate B of said formation compensating element, (9)
1, B
2, B
3, B
4... B
nOptical thickness be t
1, t
2, t
3... t
nWith the saturable absorber A that constitutes saturable absorption overall (10)
1, A
2, A
3, A
4... A
nOptical thickness be d
1, d
2, d
3, d
4... d
nCombine accordingly mutually, and meet rule:
d
1+ t
1=d
2+ t
2=...=d
n+ t
n=M (constant).
4. the laser of constant cavity length according to claim 1 and 2, the saturable absorber that it is characterized in that said formation saturable absorption overall (10) is combined accordingly mutually with the compensating plate that constitutes compensating element, (9) and is A
1+ B
1, A
2+ B
2, A
3+ B
3, A
3+ B
4... A
n+ B
n, they are arranged in ring shape, or are arranged in in-line.
5. the laser of constant cavity length according to claim 1 and 2 is characterized in that the compensating plate B of said formation compensating element, (9)
1, B
2, B
3, B
4... B
nConstitute by optical body.
6. the laser of constant cavity length according to claim 1 and 2 is characterized in that constituting the totally saturable absorber A of (10) of saturable absorption
1, A
2, A
3, A
4... A
nConstitute by dyestuff, or constitute by crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99113783A CN1118117C (en) | 1999-06-14 | 1999-06-14 | Laser with constant cavity length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99113783A CN1118117C (en) | 1999-06-14 | 1999-06-14 | Laser with constant cavity length |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1277474A CN1277474A (en) | 2000-12-20 |
| CN1118117C true CN1118117C (en) | 2003-08-13 |
Family
ID=5276934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99113783A Expired - Fee Related CN1118117C (en) | 1999-06-14 | 1999-06-14 | Laser with constant cavity length |
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| Country | Link |
|---|---|
| CN (1) | CN1118117C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449742B (en) * | 2019-01-15 | 2021-01-19 | 北京航空航天大学 | Laser bistable frequency optical path system for SERF atomic inertia measuring device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044365A (en) * | 1989-01-20 | 1990-08-01 | 中国科学院上海光学精密机械研究所 | Head-on collision pulse master-laser with active-passive lock mould |
| JPH0537048A (en) * | 1991-07-26 | 1993-02-12 | Nippon Telegr & Teleph Corp <Ntt> | Solid pulse laser system |
| US5381437A (en) * | 1992-07-20 | 1995-01-10 | Hitachi, Ltd. | High-power solid-state laser resonator |
| CN1196588A (en) * | 1998-04-29 | 1998-10-21 | 中国科学院西安光学精密机械研究所 | Method for selecting fundamental transverse mode of butt-collision mode-locked laser |
-
1999
- 1999-06-14 CN CN99113783A patent/CN1118117C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044365A (en) * | 1989-01-20 | 1990-08-01 | 中国科学院上海光学精密机械研究所 | Head-on collision pulse master-laser with active-passive lock mould |
| JPH0537048A (en) * | 1991-07-26 | 1993-02-12 | Nippon Telegr & Teleph Corp <Ntt> | Solid pulse laser system |
| US5381437A (en) * | 1992-07-20 | 1995-01-10 | Hitachi, Ltd. | High-power solid-state laser resonator |
| CN1196588A (en) * | 1998-04-29 | 1998-10-21 | 中国科学院西安光学精密机械研究所 | Method for selecting fundamental transverse mode of butt-collision mode-locked laser |
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| Publication number | Publication date |
|---|---|
| CN1277474A (en) | 2000-12-20 |
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