CN1462095A - Yellow laser using self convertor crystal intracavity sum frequency to generate yellow light - Google Patents
Yellow laser using self convertor crystal intracavity sum frequency to generate yellow light Download PDFInfo
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- CN1462095A CN1462095A CN 02121037 CN02121037A CN1462095A CN 1462095 A CN1462095 A CN 1462095A CN 02121037 CN02121037 CN 02121037 CN 02121037 A CN02121037 A CN 02121037A CN 1462095 A CN1462095 A CN 1462095A
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- laser
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- changing
- yellow
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Abstract
A yellow laser generating yellow laser beam by the frequency summation of a self-frequency-varying crystal in cavity features that a non-linear laser crystal (NYAB crystal) with both luminescent center and non-linear optical effect is used to generate 1.06 um and 1.34 um lasers in a samke laser cavity and by their frequency summation effect, a yellow laser is generated. Its advantages are low loss in cavity, compact structure and high stability.
Description
With in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light, it relates to laser technology field, particularly relates to a kind of by having the non-linear laser crystal of laser and nonlinear optical effect simultaneously---and self frequency-changing's crystal produces the Laser Devices of yellow laser.
With in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light, angle from technical background, up to now, also there are not solid (crystal), this series products of semiconductor Yellow laser on the market, from bibliographical information, yet do not use the report that the mixing in the chamber of self frequency-changing's crystal produces yellow laser.Only in U.S. military project department, begun to note the research of Yellow laser, but, their technology path and patent of the present invention are completely different, they utilize special, as can to realize noncritical phase matching ktp crystal mixing in the chamber to obtain yellow laser output, luminous and frequency conversion is to be finished respectively by the quartz crystal device that has nothing in common with each other, thereby has increased cavity loss.Essence of the present invention is a kind of new way that has proposed research and made Yellow laser, its luminous and frequency conversion is finished by same quartz crystal device, by comparison, small compact not only arranged, adjust easily, stable advantage, and because element few (thereby cavity loss is little) certainly will will have higher luminous and conversion efficiency in the laser cavity.
Self frequency-changing's crystal is the sub-composite functional material of a kind of novel photoelectric, and it has the functional crystal of Laser emission and nonlinear optics frequency conversion simultaneously, so can be referred to as non-linear laser crystal to self frequency-changing's crystal again.Mix Nd at present
3+The representative self frequency-changing's crystal of excited ion has multiple, as Nd:YAl
3(BO
3)
4(NYAB), Nd:GdAl
3(BO
3)
4(NGAB), Nd:Y
xGd
1-xAl
3(BO
3)
4(NYGAB), Nd:CaOY
4(BO
3)
3(NCYB), Nd:CaOGd
4(BO
3)
3(NCGB), Nd:Ba
2NaNb
5O
15(NBNN) etc., this crystal-like frequency conversion was used in the past, mainly be conceived to be used for producing the luminous of 1.06um and (green glow is 0.53um) or with residual pump light with produce blue light (≈ 0.46um) frequently from frequency multiplication; Also the someone begins on the basis of these self frequency-changing's crystal generations of research 1.34um laser (non-from frequency multiplication by frequency multiplication! ) generation ruddiness (0.67um).Shang Weiyou utilizes this crystal-like report that produces gold-tinted certainly with the frequency function.
With in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light, purpose of the present invention just is to disclose a kind of with in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light.It is the new application technology of self frequency-changing's crystal exploitation, for photoelectron science and technology and industry thereof increase a kind of new laser type.Here the non-linear laser crystal that relates to only relates to Nd
3+Self frequency-changing's crystal of excited ion (be commonly called as in the past and be the self-frequency-doubling crystal).With in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light also can be many solid crystal lasers and increase a kind of pumping source, for laser medicine (as, inner ear treatment) technology is filled up a kind of new light sources.
With Nd
3+In self frequency-changing's crystal for excited ion, with NYAB (Nd:YAl
3(BO
3)
4) crystal is the RM (BO of representative
3)
4(wherein, R=Y, Gd; M=Al, Sc) crystalloid is extensively developed as relative self frequency-changing's quartz crystal device more with practical value always.(Nd:CaOY was arranged again in recent years with NCYB
4(BO
3)
3) crystalloid obtains broad research for self frequency-changing's crystal of new generation of typical case representative.This shows the utilization non-linear laser crystal---self frequency-changing's crystal development new unit has good material foundation.
Self frequency-changing's crystal was used to develop self-frequency-doubling laser in the past, and promptly this crystal plays luminous in laser cavity and the frequency multiplication effect simultaneously; Also be useful on from and frequency laser develop, promptly self frequency-changing's crystal sends a kind of laser of wavelength in laser cavity, and with this light and pump light by producing the light of another kind of wavelength with the frequency process.Though the present invention also be in the chamber from and frequency laser a kind of, but oneself and frequency laser that it is different from the past again, because it requires self frequency-changing's crystal in the chamber will send the laser of two kinds of wavelength simultaneously, and by nonlinear optics and frequently effect they are become the laser of another kind of wavelength automatically.
In order to obtain the efficient of luminous preferably and frequency translation simultaneously, except select suitable non-linear laser crystal be vital, the configuration of device is of crucial importance, in general laser desired pumping and chamber mirror the design with the plated film condition, mixing produces in the new laser of yellow laser in utilizing self frequency-changing's crystal intracavity, pay special attention to guarantee that the luminous exitance of propagating in the collinear phase matching of three ripples, enough optical power density and the crystal is enough little.
With in self frequency-changing's crystal intracavity and the laser of frequency to generate yellow light, require the laser generation that in same laser cavity cavity, produces 1.06um and 1.34um simultaneously, and simultaneously the nonlinear optics by crystal produce yellow laser with the frequency effect.The optical direction of crystal must satisfy the phase-matching condition of 1.06um and 1.34um and frequency to generate yellow light 0.59um.According to satisfying the conservation of energy (ω simultaneously in the nonlinear optical effect three ripple effect conversion process
3=ω
1+ ω
2) and the conservation of momentum (k
3=k
1+ k
2) requirement of condition, the condition of three ripple collinear phase matching can be reduced to
n
3λ
3=n
1λ
2+ n
2λ
1The phase matched of three ripple mutual effects has two types in the nonlinear optical crystal.Set three light waves and satisfy ω
3＞ω
2〉=ω
1, if dn/d λ≤0 is ω
1With ω
2Light wave have identical polarization state, the phase matched of this moment is called I class coupling; Otherwise, if ω
1With ω
2Light wave polarization each other be quadrature, the phase matched of this moment is II class coupling.
Phase matched is one of method that realizes the effective frequency conversion.Its general idea is to require three kinds of frequency (ω
1, ω
2, ω
3) light wave in nonlinear dielectric in the communication process, the phase velocity of three ripples must be identical.For simple, compact, the easy row, effectively of laser cavity structure, except selecting efficiently self frequency-changing's crystal, also on the phase matched type, select the conllinear matching way.Utilize the birefringence of nonlinear optical crystal and the purpose that dispersion characteristics can reach phase matched.The position condition that is complementary has critical influence to relevant nonlinear optical effect, if this condition is not satisfied, output light just may almost can't observe.
Realize that technology path of the present invention is, Yellow laser of the present invention is made up of pumping source (1), optical coupler (2), laser cavity deielectric-coating (3), self frequency-changing's crystal (4) and laser cavity outgoing mirror (5), in its laser cavity, only dispose a quartz crystal device---self frequency-changing's crystal element (4), the generation of laser is with integrated with frequency, utilize a quasi-nonlinear optical lasers crystal---luminous and oneself and frequency (self-mixing, SSFM) the generation yellow laser (6) of self frequency-changing's crystal.Pumping source (1) can be a semiconductor laser diode LD, and its pump mode is end pump (comprising single-ended or the both-end pumping structure) or side pump; It also can be the lamp pumping source.The yellow laser (6) that produces is continuous or pulsed.
From dynamic angle, the actual laser that has produced 3 kinds of wavelength simultaneously in the chamber, still, vibration is 1.06um and two kinds of wavelength of 1.34um in the chamber, what coupling was exported is laser---the yellow laser of the 3rd kind of wavelength.Two kinds of wavelength (1.06um and 1.34um) all are to have under the condition of pumping the luminescence center by non-linear laser crystal send, and the 3rd kind of wavelength then is by same non-linear laser crystal in the chamber---the nonlinear optical effect of self frequency-changing's crystal is with the laser of the two kinds of wavelength in the front 0.59um yellow laser by producing with the frequency mode.Realize that key problem in technology of the present invention is, at the different emission wavelengths of non-linear laser crystal different emission cross sections is arranged, strict relatively phase matched is just arranged and allow the angular breadth requirement at high conversion efficiency (mixing efficiency), therefore, must select the suitable self frequency-changing's crystal and the design of device thereof for use, the design of light path and output coupling mirror all be it is also noted that corresponding requirement.
The present invention not only have laser take place with and (mixing) incorporate characteristic frequently, luminous and mixing is by a multi-functional quartz crystal device---the non-linear laser crystal device is finished, thereby brings small compact, adjustment easily, practicability advantage such as stable.And not only have utilize technical very ripe but also the high-power LD that domesticized of commodity be the convenience of pumping source.
With in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light, existing accompanying drawing is made brief description: accompanying drawing is in a kind of self frequency-changing's crystal intracavity and the structural representation of the Yellow laser of frequency to generate yellow light.Wherein, (1) is pumping source, (2) be optical coupler (optically focused head), (3) be laser cavity deielectric-coating diaphragm, it can be deielectric-coating diaphragm independently, also can be the front end end face that has plated the laser crystal of suitable media film, and (4) are the non-linear laser crystal---self frequency-changing's crystal, (5) be the laser cavity outgoing mirror, (6) are the yellow lasers of output.
With in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light, a concrete exemplary embodiments of the present invention described below in conjunction with accompanying drawing is concise and to the point:
Self frequency-changing's crystal (4) is selected NYAB (Nd:YAl for use
3(BO
3)
4) non-linear laser crystal, pumping source (1) is selected the semiconductor laser (LD) of 808nm for use.Among the figure, (1) is the LD pumping source of ≈ 0.81um; (2) be optical coupler (optically focused head); (3) be laser cavity deielectric-coating diaphragm, it can be an independently medium diaphragm, also can be that plated film forms on the front end end face of laser crystal, and it is high saturating to ≈ 0.81um LD pump light, and is high anti-to 1.06um, 1.34um and 0.59um; (4) be NYAB self frequency-changing non-linear laser crystal, two end faces of crystal, except high-quality polishing was arranged, (to 1.06um, 1.34um and three kinds of wavelength light of 0.59um all was high saturating also will to plate anti-reflection film; If laser cavity front end deielectric-coating diaphragm forms at laser crystal front end end face coating, the plated film of front end end face requires identical with (3), and three ripple high transmittance films only are plated on the other end); In addition, the logical optical axis direction of crystal---laser cavity axially must be 1.06um, 1.34um and the collinear phase matching direction that produces the 0.59um gold-tinted frequently, according to the phase matched computing formula of introducing above, can calculate, for NYAB, for the mixing by 1.06um and 1.34um obtains 0.59um, its I class collinear phase matching angle is (θ=28 °, φ=0 °), under this matching condition, it is 1.63mrad. that the phase matched of NYAB crystal allows angular width, correspondingly all will take the requirement of this characteristic of crystal into account to the design of optically focused head and chamber mirror; (5) be the laser cavity outgoing mirror, its plated film requires, to 1.06um and 1.34um must be high anti-, and be anti-reflection (anti-reflection rate is decided on specific requirement) to the yellow laser of 0.59um, in addition, consider that the 1.06um of crystal and 1.34um emission cross section have nothing in common with each other, also has another requirement for outgoing mirror, it is different to the output degree of coupling of these two kinds of wavelength, thereby makes two kinds of wavelength laser losses in the chamber different, to reach the oscillating condition that satisfies these two kinds of wavelength simultaneously; (6) yellow laser of expression coupling output.
Claims (7)
1. use in self frequency-changing's crystal intracavity and the Yellow laser of frequency to generate yellow light, it is made up of pumping source (1), optical coupler (2), laser cavity deielectric-coating (3), self frequency-changing's crystal (4) and laser cavity outgoing mirror (5), it is characterized in that: only dispose a quartz crystal device in its laser cavity---self frequency-changing's crystal element (4), the yellow laser that its output is only passed through the luminous of this self frequency-changing's crystal and produced with frequency.
2. as claimed in claim 1 with in the self frequency-changing crystal intracavity and the Yellow laser of frequency to generate yellow light, it is characterized in that: the active ions of self frequency-changing's crystal of configuration are Nd in its laser cavity
3+
3. as claimed in claim 1 or 2 with in the self frequency-changing crystal intracavity and the Yellow laser of frequency to generate yellow light, it is characterized in that: self frequency-changing's crystal of configuration is with Nd in its laser cavity
3+Be any non-linear laser crystal of active ions, as, RM (BO
3)
4(wherein, R=Y, Gd, M=Al, Sc) crystalloid, or Nd:CaOR
4(BO
3)
3(R=Y, Gd) crystalloid, or a kind of in the other types self frequency-changing crystal.
4. as claimed in claim 1 or 2 with in the self frequency-changing crystal intracavity and the Yellow laser of frequency to generate yellow light, it is characterized in that: laser generation with and frequently integrated, the laser that can be simultaneously produces 3 kinds of wavelength in the chamber, but the output light of laser has only a kind of laser of wavelength---yellow laser basically, wherein, luminescence center by crystal sends 1.06um and two kinds of wavelength of 1.34um, the 3rd wavelength is that nonlinear optical effect by same self frequency-changing's crystal in the chamber is with aforementioned 2 kinds of wavelength be produced as the yellow laser of 0.59um frequently, and with its coupling output.
5. as claimed in claim 1 it is characterized in that: described pumping source is a semiconductor laser diode LD with in the self frequency-changing crystal intracavity and the Yellow laser of frequency to generate yellow light, and its pump mode is end pump (comprising single-ended or the both-end pumping structure) or side pump.
6. as claimed in claim 1 with in the self frequency-changing crystal intracavity and the Yellow laser of frequency to generate yellow light, it is characterized in that: described pumping source is the lamp pumping source.
7. as claimed in claim 1 with in the self frequency-changing crystal intracavity and the Yellow laser of frequency to generate yellow light, it is characterized in that: described yellow laser is continuous or pulsed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121037 CN1279665C (en) | 2002-05-31 | 2002-05-31 | Yellow laser using self convertor crystal intracavity sum frequency to generate yellow light |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121037 CN1279665C (en) | 2002-05-31 | 2002-05-31 | Yellow laser using self convertor crystal intracavity sum frequency to generate yellow light |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1462095A true CN1462095A (en) | 2003-12-17 |
| CN1279665C CN1279665C (en) | 2006-10-11 |
Family
ID=29742732
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02121037 Expired - Fee Related CN1279665C (en) | 2002-05-31 | 2002-05-31 | Yellow laser using self convertor crystal intracavity sum frequency to generate yellow light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503183A (en) * | 2014-12-10 | 2015-04-08 | 天津大学 | Self-frequency-conversion terahertz parametric oscillator |
-
2002
- 2002-05-31 CN CN 02121037 patent/CN1279665C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503183A (en) * | 2014-12-10 | 2015-04-08 | 天津大学 | Self-frequency-conversion terahertz parametric oscillator |
| CN104503183B (en) * | 2014-12-10 | 2018-04-03 | 天津大学 | Self frequency-changing's tera-hertz parametric oscillator |
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| Publication number | Publication date |
|---|---|
| CN1279665C (en) | 2006-10-11 |
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Granted publication date: 20061011 |