CN101719627B - Electro-optical Q-switched laser resonator - Google Patents
Electro-optical Q-switched laser resonator Download PDFInfo
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- CN101719627B CN101719627B CN2009102726835A CN200910272683A CN101719627B CN 101719627 B CN101719627 B CN 101719627B CN 2009102726835 A CN2009102726835 A CN 2009102726835A CN 200910272683 A CN200910272683 A CN 200910272683A CN 101719627 B CN101719627 B CN 101719627B
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Abstract
The invention provides an electro-optical Q-switched laser resonator which comprises a totally reflecting mirror, a laser medium, an electro-optical Q-switched crystal and an output mirror, wherein the laser medium and the electro-optical Q-switched crystal are positioned between the totally reflecting mirror and the output mirror, and a pump source adopts a side-pumped mode or an end-pumped mode. The electro-optical Q-switched laser resonator is characterized in that the transmission surface of the electro-optical Q-switched crystal near the laser medium is a cut surface which is coated with an anti-reflection film layer, the included angle between the transmission surface of the electro-optical Q-switched crystal away from the laser medium and the cut surface is alpha or 90 DEG-alpha, wherein alpha=90 DEG-arc tg(n), and n is the refractive index of the electro-optical Q-switched crystal. The electro-optical Q-switched laser resonator can be used without inserting a Brewster polarizer, thereby reducing the insertion loss, improving the optical mechanical stability and shortening the length of the laser resonator. The automatic polarization electro-optical Q-switched crystal can be any electro-optical Q-switched crystal for the transverse electro-optical effect, such as BBO, RTP, LN or the like. The resonator has only one polarization state, is especially suitable for the electro-optical Q-switched requirements, and plays the role of combining the electro-optical Q-switched crystal with the Brewster polarizer.
Description
Technical field
The invention belongs to laser technology, be specifically related to a kind of electric-optically Q-switched laser resonator.
Background technology
Electric-optically Q-switched is the electro optic effect of utilizing crystal, by the variation of optical electric field polarization direction in the laserresonator, realizes the adjusting of laser generation Q value.It can produce the laser pulse of narrow pulse width, high-peak power.For guaranteeing to realize good Q switching effect, need to place polarizing component in traditional electric-optically Q-switched resonant cavity.Generally use at present rise inclined to one side, the analyzing device of Brewster eyeglass as optical electric field in the chamber.
That inserts in the conventional laser resonant cavity plays inclined to one side Brewster eyeglass and can bring some inconvenience and inferior position: the deielectric-coating that (1) Brewster mirror is coated with mainly is in order to improve the degree of polarization of optical electric field parallel component in the chamber, there is not antireflective effect significantly for optical maser wavelength, therefore bring bigger insertion loss to resonant cavity, simultaneously, because light intensity is higher in the chamber, this rete easy damaged has limited the raising of electric-optically Q-switched laser peak power.(2) the Brewster mirror is as an element independently, optics plays folk prescription and satisfies the position relation of transferring Q to require to having with the induction main shaft of electrooptic crystal, in the debug process of laser, will be under high voltage condition, rotate crystal eyeglass relative bearing, operational hazards, complexity, the optical-mechanical poor stability.(3) in order to install at the chamber internal fixation and to regulate the Brewster mirror, the microscope base adjusting bracket has occupied bigger locus, and it is long to have increased laserresonator, is unfavorable for compressing electric-optically Q-switched laser pulse width.
Summary of the invention
The objective of the invention is to overcome in the above-mentioned electric-optically Q-switched laserresonator must with electric-optically Q-switched crystal must and the weak point that is used in combination of Brewster mirror, a kind of electric-optically Q-switched laser resonator is provided, this resonant cavity has reduced the insertion loss, can improve optical-mechanical stability, and shorten the laser resonance cavity length.
Electric-optically Q-switched laser resonator provided by the invention, comprise total reflective mirror, laser medium, electric-optically Q-switched crystal and outgoing mirror, laser medium and electric-optically Q-switched crystal are all between total reflective mirror and outgoing mirror, pumping source adopts side or end pumping mode, it is characterized in that: described electric-optically Q-switched crystal is a cut surface near the logical light face of laser medium, be coated with antireflective coating on this cut surface, electric-optically Q-switched crystal equals α or 90 °-α away from the logical light face of laser medium and the angle of described cut surface, wherein, α=90 °-arctg (n), n is the refractive index of electric-optically Q-switched crystal.
The present invention adopts the electrooptic crystal (promptly from the polarization electrooptic crystal) of pressing the certain angle cutting in resonant cavity, some face angle of the cutting planes of electrooptic crystal and crystal satisfies the condition of the complementary angle of crystal Brewster's angle, guarantee that horizontal λ/4 voltages can turn-off light path in the chamber effectively, this moment, electrooptic crystal also played the effect of analyzer.Therefore, do not need to insert the Brewster polarizer in the electric-optically Q-switched resonant cavity.This automatic polarization electro-optical Q crystal can be the electric-optically Q-switched crystal of the cross electro-optical effect that is useful on, as BBO, RTP, LN etc.Only there is a kind of polarization state in this resonant cavity, is particularly suitable for electric-optically Q-switched requirement, can play the effect that electric-optically Q-switched crystal and Brewster mirror are united two into one in actual applications.Particularly, the invention has the advantages that:
(1) this resonant cavity adopts the automatic polarization electro-optical Q crystal, can not use traditional Brewster mirror, makes resonant cavity reduce the optical element of a non-gain, reduces and inserts loss in the chamber, helps improving the energy of laser Q-switching pulse.
(2), need not to rotate electrooptic crystal, handling safety, convenient debugging for isotropic gain medium.
(3) this new pattern laser resonant cavity can shorten the cavity length under the equal conditions, can compress the Q pulse duration effectively, helps to improve the peak power of laser Q pulse.
(4) the automatic polarization electro-optical Q crystal that adopts in the resonant cavity can play partially, the effect of analyzing, modulation simultaneously, can obtain the electric-optically Q-switched effect of getting well, and can be the electric-optically Q-switched crystal of the cross electro-optical effect that is useful on.
Description of drawings
Fig. 1 .1,1.2 is two kinds of traditional electric-optically Q-switched laser resonators;
Fig. 2 is a kind of example structure schematic diagram of electric-optically Q-switched laser resonator of the present invention;
Fig. 3 is the another kind of example structure schematic diagram of electric-optically Q-switched laser resonator of the present invention;
Fig. 4 is traditional electric-optically Q-switched crystal structure figure;
Fig. 5 is an automatic polarization electro-optical Q crystal example structure schematic diagram of the present invention;
Fig. 6 is another example structure schematic diagram of automatic polarization electro-optical Q crystal of the present invention;
Embodiment
Shown in Fig. 1 .1, Fig. 1 .2, traditional electric-optically Q-switched laser resonator comprises total reflective mirror 1, pumping source 2, laser medium 3, polarizer 4 (Brewster mirror), electric-optically Q-switched crystal 5, outgoing mirror 6 and electric light power supply 7.Pumping source 2 adopts the profile pump mode among Fig. 1 .1, and pumping source 2 adopts the end pumping mode among Fig. 1 .2.
As shown in Figures 2 and 3, adopt the profile pump laserresonator of automatic polarization electro-optical Q crystal to comprise total reflective mirror 1, pumping source 2, laser medium 3, electric light power supply 7, automatic polarization electro-optical Q crystal 8 and outgoing mirror 6.
Total reflective mirror 1, laser medium 3, automatic polarization electro-optical Q crystal 8 and outgoing mirror 6 are positioned at successively with on the light path, and electric light power supply 7 is connected with automatic polarization electro-optical Q crystal 8.Pumping source 2 is positioned at a side of laser medium 3 among Fig. 2, adopts the profile pump mode, and it also can be that semiconductor is LD that pumping source 2 can be selected photoflash lamp.Pumping source is positioned at a side of the outer total reflective mirror 1 of resonant cavity among Fig. 3, adopts the end pumping mode, and it is LD that pumping source is selected semiconductor.Total reflective mirror 1 is coated with the high-reflecting film layer of optical maser wavelength among Fig. 2.Total reflective mirror 1 is coated with the high-reflecting film layer of optical maser wavelength and to the high saturating rete of pump light wavelength among Fig. 3.
Electric light power supply 7 control automatic polarization electro-optical Q crystal 8.Laser medium 4 is solid laser crystals, as Nd:YAG, Nd:YVO
4, Nd:YAP, Nd:GdVO
4Deng, outgoing mirror 6 is to be the rete that continuous pump mode and pulse pump mode select accordingly optical maser wavelength to be had certain transmitance according to pumping source, selects 10%-40% for continuous pump mode outgoing mirror rete; Select 50%-80% for pulse pump mode outgoing mirror rete.
Automatic polarization electro-optical Q crystal 8 cuts traditional electric light adjusting Q crystal shown in Figure 4 according to certain angle and forms.
As shown in Figure 4, traditional electric-optically Q-switched crystal is a cuboid, and Z-direction is an optical axis of crystal direction, and the ABCD plane and the EFGH plane that are parallel to the XY in-plane are logical light face, the plane vertical with the XY in-plane is the plane that is coated with electrode, generally applies high pressure along X-direction or Y direction.Apply the crystal of high pressure for different directions, its cutting mode is had nothing in common with each other, and two kinds of example structure as shown in Figure 5 and Figure 6.The plane that the cutting of crystal forms and some plane included angle α of crystal satisfy the condition of the complementary angle of crystal Brewster's angle, the refractive index that is crystal is n, α=90 °-arctg (n), guarantee that horizontal λ/4 voltages can turn-off light path in the chamber effectively, the end face of the cutting of automatic polarization electro-optical Q crystal 8 must be near laser medium 3, and this moment, electrooptic crystal played analyzer and electric-optically Q-switched effect simultaneously.
As shown in Figure 5, the logical light face of electrooptic crystal is ABCD face and the EFGH face that is parallel to the XY plane, and electrode is coated on ABEF face and the CDGH face that is parallel to the XZ plane, along the Y direction making alive.Automatic polarization electro-optical Q crystal 8 is along the certain angle sliced crystal, forms the IJKL plane.The angle α of planar I JKL and plane GHKL satisfies the condition of Brewster's angle complementary angle, and promptly the refractive index of crystal is n, α=90 °-arctg (n).IJKL plane that cuts out and logical light facial plane (as the EFGH plane) are coated with the antireflective coating of corresponding optical maser wavelength, and EFIJ plane and GHKL plane are coated with electrode, add high pressure along Y direction.
As shown in Figure 6, the logical light face of electrooptic crystal is ABCD face and the EFGH face that is parallel to the XY plane, and electrode is coated on ACEG face and the BDFH face that is parallel to the YZ plane, along the X-direction making alive.Automatic polarization electro-optical Q crystal 8 is along the certain angle sliced crystal, forms the IJKL plane.The angle α on planar I JKL and logical light face EFGH plane satisfies the condition of Brewster's angle complementary angle, and promptly the refractive index of crystal is n, α=90 °-arctg (n).IJKL plane that cuts out and logical light facial plane (as the EFGH plane) are coated with the antireflective coating of corresponding optical maser wavelength, and EGIK plane and FHJL plane are coated with electrode, add high pressure along X-direction.
In Fig. 2 and structure shown in Figure 3, the position of laser medium 3 and automatic polarization electro-optical Q crystal 8 all can exchange, but the end face of the cutting of automatic polarization electro-optical Q crystal 8 must be near laser medium 3.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.So everyly do not break away from the equivalence of finishing under the spirit disclosed in this invention or revise, all fall into the scope of protection of the invention.
Claims (1)
1. electric-optically Q-switched laser resonator, comprise total reflective mirror (1), laser medium (3), electric-optically Q-switched crystal and outgoing mirror (6), laser medium (3) and electric-optically Q-switched crystal all are positioned between total reflective mirror (1) and the outgoing mirror (6), pumping source (2) adopts side or end pumping mode, it is characterized in that: described electric-optically Q-switched crystal is a cut surface near the logical light face of laser medium (3), be coated with antireflective coating on this cut surface, electric-optically Q-switched crystal equals α or 90 °-α away from the logical light face of laser medium (3) and the angle of described cut surface, wherein, α=90 °-arctg (n), n is the refractive index of electric-optically Q-switched crystal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102726835A CN101719627B (en) | 2009-11-06 | 2009-11-06 | Electro-optical Q-switched laser resonator |
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| CN2009102726835A CN101719627B (en) | 2009-11-06 | 2009-11-06 | Electro-optical Q-switched laser resonator |
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| CN101719627A CN101719627A (en) | 2010-06-02 |
| CN101719627B true CN101719627B (en) | 2011-01-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105762639A (en) * | 2016-05-11 | 2016-07-13 | 哈尔滨医科大学 | High cutting laser |
| CN106025783A (en) * | 2016-06-06 | 2016-10-12 | 中国工程物理研究院应用电子学研究所 | Q-switched pulse laser for quickly switching polarization states |
| CN106154396B (en) * | 2016-07-05 | 2019-05-14 | 北京大学 | A kind of ultra wide band Terahertz Brewster vacuum window and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3564450A (en) * | 1967-10-11 | 1971-02-16 | Kollsman Instr Corp | Electro-optic q-switch using brewstek angle cut pockels cell |
| CN1051641A (en) * | 1990-11-21 | 1991-05-22 | 青岛化工学院 | The electro-optical Q-switch of the band polarizer |
| US5130995A (en) * | 1989-04-25 | 1992-07-14 | Lightwave Electronics Corp. | Laser with Brewster angled-surface Q-switch alinged co-axially |
| EP1365275A2 (en) * | 2002-05-20 | 2003-11-26 | Shandong University | Electro-optic Q-switch with Langasite-type single crystal |
-
2009
- 2009-11-06 CN CN2009102726835A patent/CN101719627B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3564450A (en) * | 1967-10-11 | 1971-02-16 | Kollsman Instr Corp | Electro-optic q-switch using brewstek angle cut pockels cell |
| US5130995A (en) * | 1989-04-25 | 1992-07-14 | Lightwave Electronics Corp. | Laser with Brewster angled-surface Q-switch alinged co-axially |
| CN1051641A (en) * | 1990-11-21 | 1991-05-22 | 青岛化工学院 | The electro-optical Q-switch of the band polarizer |
| EP1365275A2 (en) * | 2002-05-20 | 2003-11-26 | Shandong University | Electro-optic Q-switch with Langasite-type single crystal |
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