CN103872576B - The closely homocentric stable cavity gas Raman laser instrument of one kind - Google Patents
The closely homocentric stable cavity gas Raman laser instrument of one kind Download PDFInfo
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- CN103872576B CN103872576B CN201210535678.0A CN201210535678A CN103872576B CN 103872576 B CN103872576 B CN 103872576B CN 201210535678 A CN201210535678 A CN 201210535678A CN 103872576 B CN103872576 B CN 103872576B
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- raman
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Abstract
The present invention is a kind of inner chamber Raman laser instrument of employing gas Raman medium, by left concave surface hysteroscope（To basic frequency laser high reflection）, basic frequency laser medium, basic frequency laser adjusts Q unit, basic frequency laser medium pumping source, two-phase Look mirror（Highly transmissive to basic frequency laser, to raman laser high reflection）, Raman pond, right concave surface hysteroscope（To basic frequency laser high reflection, it is T to raman laser absorbance）With raman laser total reflective mirror totally eight part composition.In the present invention, in Raman pond, the basic frequency laser light beam therefore in Raman pond is little for the beam waist position of basic frequency laser, and power density is big, is conducive to improving Raman transformation efficiency；At laser medium, the beam radius of fundamental frequency light are big, can make full use of basic frequency laser medium；The distance between two other concave surface hysteroscope L is slightly smaller than two hysteroscope radius of curvature R 1, R2 sum, and therefore this resonator cavity meets stable cavity condition, and its waist radius is very little, and power density is big, can effectively reduce Raman transform key.
Description
Technical field
The present invention is a kind of inner chamber Raman laser instrument of employing gas Raman medium, with the chamber realizing raman laser frequency conversion
Interior Ramar laser is relevant, and the present invention can reduce Ramar laser using closely homocentric stable cavity as basic frequency laser resonator cavity
Threshold value.
Background technology
Raman scattering techniques are the important technical realizing wavelength conversion, and the excited Raman using Raman medium dissipates
Penetrate and can realize the change to optical maser wavelength.Physical form according to Raman medium can be divided into solid Roman medium, liquid Raman
Medium and gas Raman medium.The general small volume of solid Roman medium, Raman concentration of medium height, gain and high conversion rate, and
People have been developed that many kinds of solids Raman medium, and application is quite varied, but solid Roman dielectric damages threshold value is low, are difficult to realize height
Energy exports.Liquid Raman medium then due to the volatility of liquid medium, the defect such as toxicity or unstability, range of application is subject to
Considerable restraint.Comparatively, gas Raman medium has the Raman light uniformity height of generation, damage threshold height is more likely realized greatly
Energy raman laser exports, and high Raman vibrates mould（Big Raman frequency shift）The advantages of with narrow Raman linewidth, also obtain sufficient weight
Depending on；Conventional gas Raman medium has N2, H2, O2And CH4Deng, but due to the ion concentration of gas medium too little it is therefore necessary to increase
Big incident illumination and increase Raman medium operating distance, the threshold value that this results in gas Raman medium is high, the low deficiency of transformation efficiency.
Mainly comprise two kinds using the method that gas medium realizes LR laser raman frequency displacement at present, the first is to adopt exocoel
Method, will Raman medium be positioned over outside laser cavity, and the basic frequency laser of laser instrument output, through lens focuss, passes through Raman in one way
Produce stimulated Raman scattering during medium, produce stokes light or anti-Stokes light, in the process, only focusing on thoroughly
In a bit of region near the focal position of mirror, laser power density can reach stimulated Raman scattering threshold value, in this region
The frequency conversion to basic frequency laser for the stimulated Raman scattering realization, the therefore useful effect region of laser and Raman medium can occur
Short, Raman transformation efficiency is not high, the power threshold of basic frequency laser is required also higher simultaneously.
Another method is using Raman resonator cavity, and the method includes for Raman medium being positioned over laser resonance intracavity
（Intracavity）It is individually placed at a resonance intracavity with by Raman medium（External cavity type）Two kinds of forms, wherein intracavity are by laser
Medium and Raman medium are all placed on laser intracavity, using two-phase Look mirror as output coupling mirror, make basic frequency laser only in intracavity shake
Swing and externally do not export, only Raman light externally exports；So fundamental frequency light and Stokes light multipass Raman medium, are equivalent to
Increase the effective interaction length of basic frequency laser and Raman medium, therefore can improve the Raman transformation efficiency of basic frequency laser, with
When reduce power requirement to basic frequency laser, be equivalent to and reduce excited Raman threshold value.Inner chamber Raman is due to make use of resonance
The very high advantage of intracavity fundamental frequency optical power density, it is easier to produce stimulated Raman scattering, forms raman laser output.Using drawing
The Raman frequency shift device of graceful resonator cavity also becomes Ramar laser.
In the development of Ramar laser, the cavity effects of raman laser resonator cavity are major issues therein.Adopt at present
Research with the Ramar laser of solid Roman medium is more active, and related raman laser lumen type is also relatively more, but adopts gas
The inner chamber Raman laser instrument species of body Raman medium is also little.In addition, in existing gas Raman laser resonant cavity, or
It is in order to pursue larger laser medium model volume and to increase intracavity beam radius, thus sacrifice the laser work(at Raman medium
Rate density；Or reduce intracavity beam radius for the laser power density at guarantee Raman medium, thus reduce laser
Model volume, is unfavorable for making full use of of laser medium.In addition, the stability of laserresonator also can affect raman laser output effect
Really.
Content of the invention
For the problems referred to above of the Ramar laser using gas Raman medium, for reducing gas Raman transform key, carry
Go out one kind and can both ensure basic frequency laser medium model volume, the closely common of small light spot radius can have been obtained at Raman medium simultaneously again
Heart concave-concave stable cavity gas Raman laser instrument.
The closely homocentric stable cavity gas Raman laser instrument of one kind, including optical cavity, optical cavity includes two about the bases being oppositely arranged
The concave mirror of frequency laser, is disposed with basic frequency laser medium between two fundamental frequency total reflective mirrors, basic frequency laser adjusts Q unit,
, the two-phase Look mirror of Raman light total reflection highly transmissive to fundamental frequency light and gas Raman pond；Right side concave surface basic frequency laser total reflective mirror is to drawing
Graceful light transmission rate is T, and the upper and lower ends of basic frequency laser medium are symmetrically arranged with two basic frequency laser pumping sources, two-phase Look mirror upper end
It is equipped with Raman light completely reflecting mirror.
Basic frequency laser medium, basic frequency laser adjust Q unit, two-phase Look mirror, gas Raman pond all in two concave mirrors
Arrange on the line of the heart.
The gas Raman medium that this Ramar laser adopts is placed in airtight Raman pond, and the two ends of Raman pond are equipped with and are coated with base
Frequency light and the optical window of Raman light high transmittance film, optical window center is on the line at two concave mirror centers；Gas Raman medium
The big solid of laser damage threshold or liquid Raman medium, it is possible to achieve big energy, the raman laser output of high optical uniformity.
The beam waist position of basic frequency laser in Raman pond, girdle the waist little, and power density is big by the therefore basic frequency laser in Raman pond,
Be conducive to improving Raman transformation efficiency；At laser medium, the beam radius of fundamental frequency light are big, can make full use of laser medium.
The distance between two concave surface hysteroscopes L is slightly smaller than two hysteroscope radius of curvature R 1, R2 sum, and therefore this resonator cavity meets
Stable cavity condition, and its waist radius is very little, power density is big, can effectively reduce Raman transform key.
Also be placed between basic frequency laser medium and Raman pond one highly transmissive to fundamental frequency light, the two of Raman light total reflection
Phase Look mirror, this two-phase Look mirror constitutes Raman resonator cavity with its upper end Raman completely reflecting mirror and right side concave mirror again, makes to draw
Graceful light vibrates in this intracavity, is conducive to the amplification of Raman light.
The closely homocentric stable cavity that the present invention adopts can also reduce the sensitivity to misalignment loss for this laser instrument, reduces experiment
In the hot spot that caused due to cavity mirror misalignment distort, reduce the adjustment difficulty of laser cavity, improve the stability of gas Raman laser instrument.
Brief description
Accompanying drawing 1 is the structure chart of closely homocentric stable cavity gas Raman laser instrument according to the present invention.In figure：1 concave surface chamber
Mirror（To basic frequency laser high reflection）, 2 basic frequency laser media, 3 basic frequency laser pumping sources, 4 basic frequency lasers tune Q unit, 5
Two-phase Look mirror（Highly transmissive to basic frequency laser, to raman laser high reflection）, 6 Raman ponds, 7 concave surface hysteroscopes（To basic frequency laser
High reflection, is T to raman laser absorbance）, 8 raman laser completely reflecting mirrors.
Accompanying drawing 2 be under closely homocentric stable cavity working condition involved in the present invention basic frequency laser and raman laser in intracavity
Index path.In figure：1 concave surface hysteroscope（To basic frequency laser high reflection）, 2 basic frequency laser media, 3 basic frequency laser pumping sources,
4 basic frequency lasers adjust Q unit, 5 two-phase Look mirrors（Highly transmissive to basic frequency laser, to raman laser high reflection）, 6 Raman ponds,
7 concave surface hysteroscopes（To basic frequency laser high reflection, it is T to raman laser absorbance）, 8 raman laser completely reflecting mirrors.In figure is real
Curve represents the optical field distribution of basic frequency laser, and thick dashed line represents raman laser bundle in intracavity vibration and output situation.
Specific embodiment
Refer to shown in accompanying drawing 1.All of in addition to basic frequency laser pumping source 3 and raman laser total reflective mirror 8 in the present invention
Element is arranged all on the line at two hysteroscope centers, and the leftmost side of this gas Raman laser instrument is to be coated with fundamental frequency light high-reflecting film
Be all-trans concave mirror 1, and basic frequency laser medium 2 is placed on the right side of the concave mirror 1 that is all-trans（As YAG crystal）, basic frequency laser medium 2 upper and lower
Both sides are placed with two basic frequency laser pumping sources 3（Can be xenon flash lamp or semiconductor laser tube array）, basic frequency laser medium 2
Right side be basic frequency laser adjust Q unit 4, adjust Q unit 4 right side be to basic frequency laser high transmission, raman laser high reflection two
Phase Look mirror 5, the Raman pond 6 full of Raman gas medium is placed on the right side of two-phase Look mirror 5, and the rightmost side is complete to basic frequency laser for being coated with
Reflection, raman laser absorbance are the concave surface hysteroscope 7 of T, and the top of two-phase Look mirror 5 is raman laser completely reflecting mirror 8.
In the present invention, the distance between former and later two concave mirrors 1 and 7（I.e. resonator is long）It is slightly less than this two concave mirrors
Radius of curvature R 1（Left side）And R2（Outside）Sum.The leftmost side and rightmost side hysteroscope, to basic frequency laser high reflection, form fundamental frequency and swash
The resonator cavity of light；Two-phase Look mirror forms the sub-resonant cavity of raman laser with right-hand member concave mirror.Basic frequency laser forms in biconcave mirror
Closely homocentric intracavity of stablizing vibrates, and raman laser vibrates in the sub-resonant cavity that two-phase Look mirror is become with concave ends microscope group.Raman pond
It is centrally located at the place with a tight waist of basic frequency laser, so maximum in the power of the center fundamental frequency light of Raman pond, it is possible to decrease Raman converts
Power threshold.Basic frequency laser medium is located at the left side of concave-concave stable cavity, and the beam radius of basic frequency laser are larger herein, therefore permissible
Preferably utilize basic frequency laser medium, improve the energy density of intracavity basic frequency laser, be conducive to raman laser to export.
The specific embodiment of the invention, when the YAG laser medium that the present invention adopts xenon flash lamp pumping produces fundamental frequency light, with CH4Make
For the output of Raman media implementation raman laser：Using CH4 as during Raman medium it is desirable to the wavelength of raman laser of output is
1543nm, the concave mirror 1 therefore now adopting is the high reflective mirror to 1064nm wavelength, and two-phase Look mirror 5 is coated with high to 1064nm saturating
Penetrate, the membrane system to 1543nm high reflection, CH4It is plated with high to 1064nm and 1543nm saturating on the two ends window lens of Raman pond 6
Anti-reflection film system, concave surface hysteroscope 7 is coated with to 1064nm wavelength high reflection, is the membrane system of T to 1543nm transmitance, such YAG swashs
The laser of the 1064nm that optical medium produces adjusts Q unit 4, two-phase Look mirror 5 and Raman pond 6 through YAG crystal 2, basic frequency laser, recessed
Vibrate between face hysteroscope 1 and concave surface hysteroscope 7, gas Raman medium CH4Produce in the presence of 1064nm basic frequency laser
1543nm raman laser vibrates between Raman total reflective mirror 8 and concave surface hysteroscope 7 through Raman pond 6 and two-phase Look mirror 5, and through concave surface chamber
Mirror 7 exports.Because the long L in the chamber of this laser cavity is slightly smaller than two hysteroscope radius of curvature R 1, R2 sum, it is designated as L=R1+R2- δ, wherein δ
It is to be adjusted, by hysteroscope, a small amount of that error is affected, in the present embodiment, δ is about 2cm, i.e. R1, R2 is respectively 50cm and 150cm, L is
198cm.From the computing formula (3) of confocal parameter f, confocal parameter f is very little, therefore can be by formula（4）Draw 1064nm
Laser is minimum in the waist radius w0 of intracavity, formula（4）Middle λ is fundamental laser wavelength.Concave surface hysteroscope 1 and concave surface chamber in the present embodiment
Mirror 7 with respect to position z1 with a tight waist, z2 respectively by（1）,（2）Be given, wherein positive sign represents that this hysteroscope is located at right side with a tight waist, bears
Number represent that this hysteroscope is located at left side with a tight waist.
In the present embodiment, CH4The center of Raman pond 4 is positioned over the position of 1064nm laser beam waist, and that is, concave surface hysteroscope 1 is located at
At Raman pond 4 center left z1, concave surface hysteroscope 7 is located at Raman pond 4 central right z2（Disregard sign）.Due to basic frequency laser
Spot radius at Raman pond center are minimum, therefore can improve the power density of fundamental frequency light, effectively reduce raman laser conversion
Power threshold.Experiment shows, when the intracavity power of 1064nm basic frequency laser is 150,000 W, intracavity persistent period about 40ns（I.e. base
Frequency light energy about 5.8mJ）When, Raman pond length is 20cm, and concave surface hysteroscope 6 is about for the output coupling rate of 1543nm laser
It is possible to observe 50 micro- burnt raman lasers outputs it was demonstrated that present invention reduces Raman transform key in the case of 30%.
Claims (5)
1. the closely homocentric stable cavity gas Raman laser instrument of one kind, including optical cavity, is characterized in that optical cavity includes two about and sets in opposite directions
The concave mirror of the basic frequency laser put, is disposed with basic frequency laser medium between two fundamental frequency total reflective mirrors, basic frequency laser adjusts Q
Unit, the two-phase Look mirror of Raman light total reflection highly transmissive to fundamental frequency light, Raman pond, right side concave surface basic frequency laser total reflective mirror is to drawing
Graceful light transmission rate is T, and the upper and lower ends of basic frequency laser medium are symmetrically arranged with two basic frequency laser pumping sources, two-phase Look mirror upper end
Raman light completely reflecting mirror is equipped with Raman light light path；
The distance between two concave mirrors in left and right L is slightly smaller than two concave mirror radius of curvature R 1, R2 sum, therefore optical cavity
It is closely homocentric stable cavity, the relation between R1, R2 and L is L=R1+R2- δ, wherein δ is to adjust surplus, be one on the occasion of in a small amount；
In closely homocentric stable cavity, through basic frequency laser medium, basic frequency laser adjusts Q unit to basic frequency laser, and two-phase Look mirror transmission, through Raman
Pond, vibrates in the resonator cavity of left and right sides concave surface basic frequency laser total reflective mirror composition；Raman light is through Raman pond, anti-through two-phase Look mirror
Penetrate up Raman light completely reflecting mirror and right side basic frequency laser is all-trans, raman laser transmitance be T concave surface hysteroscope between shake
Swing, finally exported by right side concave surface hysteroscope.
2. closely homocentric stable cavity gas Raman laser instrument according to claim 1, is characterized in that：Basic frequency laser medium, base
Frequency laser adjusts Q unit, two-phase Look mirror, gas Raman pond to arrange all on the line at two concave mirror centers.
3. closely homocentric stable cavity gas Raman laser instrument according to claim 2, is characterized in that：This Ramar laser adopts
The two ends in gas Raman pond be equipped with the optical window being coated with fundamental frequency light and Raman light high transmittance film, optical window center is in two concave surfaces and is all-trans
On the line at mirror center.
4. closely homocentric stable cavity gas Raman laser instrument according to claim 1, is characterized in that：The position with a tight waist of basic frequency laser
Put in Raman pond, the basic frequency laser light beam therefore in Raman pond is little, power density is big, be conducive to improving Raman transformation efficiency；
At laser medium, the beam radius of fundamental frequency light are big, can make full use of laser medium；This stable cavity reduces this laser instrument to mistake
Adjust the sensitivity of loss, reduce in experiment because the hot spot that cavity mirror misalignment causes distorts, reduce the adjustment difficulty of laser cavity, improve
The stability of gas Raman laser instrument.
5. closely homocentric stable cavity gas Raman laser instrument according to claim 3, is characterized in that：Adjust Q mono- in basic frequency laser
Also be placed with, the two-phase Look mirror of Raman light total reflection highly transmissive to fundamental frequency light between unit and Raman pond, this two-phase Look mirror with
Its upper end Raman light completely reflecting mirror and right side concave mirror constitute Raman resonator cavity again, so that Raman light is vibrated in this intracavity,
Be conducive to the amplification of Raman light.
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| CN201210535678.0A CN103872576B (en) | 2012-12-10 | 2012-12-10 | The closely homocentric stable cavity gas Raman laser instrument of one kind |
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| CN201210535678.0A CN103872576B (en) | 2012-12-10 | 2012-12-10 | The closely homocentric stable cavity gas Raman laser instrument of one kind |
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| CN103872576A CN103872576A (en) | 2014-06-18 |
| CN103872576B true CN103872576B (en) | 2017-03-08 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105305222A (en) * | 2014-07-28 | 2016-02-03 | 中国科学院大连化学物理研究所 | Raman laser capable of outputting variable-obscuration-ratio annular beam |
| CN105633791B (en) * | 2014-10-27 | 2019-04-02 | 中国科学院大连化学物理研究所 | A kind of more light path Ramar lasers of shrink beam |
| CN106711752A (en) * | 2015-11-12 | 2017-05-24 | 中国科学院大连化学物理研究所 | Intracavity gas Raman laser based on principle of rotational Raman |
| CN105572099B (en) * | 2016-01-14 | 2018-06-26 | 上海理工大学 | LR laser raman gas-detecting device based on homocentric hysteroscope |
| CN110556695A (en) * | 2018-06-03 | 2019-12-10 | 中国科学院大连化学物理研究所 | 2.8 micron wave band wavelength tunable laser |
| CN111413317B (en) * | 2020-04-29 | 2021-09-21 | 中国科学院长春光学精密机械与物理研究所 | Stimulated Raman gas sensing system based on annular optical fiber resonant cavity |
| CN111562237A (en) * | 2020-05-26 | 2020-08-21 | 中国科学院合肥物质科学研究院 | CO based on double-beam cavity enhanced spectroscopy technology2、N2O stable isotope simultaneous detection device and method |
| CN116544767A (en) * | 2023-05-23 | 2023-08-04 | 山东大学 | Continuous wave ultraviolet solid laser with narrow beam waist |
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| US4327337A (en) * | 1980-01-03 | 1982-04-27 | General Electric Company | Intracavity raman frequency conversion in a high power laser |
| US5012483A (en) * | 1990-09-27 | 1991-04-30 | The United States Of America As Represented By The Secretary Of The Navy | Narrow-bandwidth diffraction-limited coupled stable-unstable resonator laser cavity |
| CN100365887C (en) * | 2005-09-23 | 2008-01-30 | 南京大学 | Separation type Raman laser in full solid state |
| CN101350495A (en) * | 2008-09-02 | 2009-01-21 | 清华大学 | Raman laser with various reflection index |
| CN201549759U (en) * | 2009-10-09 | 2010-08-11 | 湖北工业大学 | Medical high power solid laser with wavelength of 532nm |
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