CN104934849B - A kind of confocal unstable resonator Ramar laser with seed light - Google Patents
A kind of confocal unstable resonator Ramar laser with seed light Download PDFInfo
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Abstract
The invention discloses a kind of confocal unstable resonator Ramar laser with seed light input, including the confocal unstable resonator one and two of short focus speculum sidepiece path-splitting is shared, it is corresponding to produce pump wavelength respectively1With Raman wavelength λ2Vibration, realizes that two pump lights and Raman light have public focus in respective optical cavity interior resonance, two optical cavities, Raman pond is placed on public focus, and it is λ fully to receive wavelength using dichroscope1Pump light come to produce wavelength be λ2Raman light；Confocal unstable resonator work characteristics is utilized simultaneously, using seed light is sent into confocal unstable resonator corresponding to scraper mirror to Raman light two, realizes lower excited Raman threshold value and Geng Gao raman laser output.
Description
Technical field
The present invention relates to a kind of Ramar laser, relates particularly to a kind of confocal unstable resonator raman laser with seed light
Device.
Background technology
Ramar laser is interacted by pump light and the raman gain medium being placed in Raman light optical cavity and drawn to produce
Graceful wavelength laser, this is a kind of nonlinear optical technique, by the selection of various Raman active media, can be swashed with a certain wavelength
Light is the output that pumping source realizes a variety of longer wave band of laser.
The comparative maturity that solid dielectric Ramar laser has developed at present, generally there is pump light optical cavity to produce pumping
Light, pump light are acted on raman gain medium, caused Raman wavelength light in Raman light optical cavity starting of oscillation and produce Raman and swash
Light output.Common Ramar laser has the forms such as common optical elements light path and optic fibre light path.
Although solid Roman medium has relatively high gain, because its damage threshold is significantly lower than gas, therefore
Only gas just can be suitably used for the Raman medium for the Ramar laser that superlaser is pumping source.In addition La Man Frequency if desired
When moving bigger, gas Raman medium can only be also selected.Because density of gas molecules is less than solid, Raman gain is than relatively low, drawing
The threshold value of graceful ray laser is high, and starting of oscillation is difficult, it is not easy to realizes excited Raman.
Seed light input is that a kind of widely used reduction laser goes out photo threshold, improves the side of laser beam quality
Method, but its application on Ramar laser is also fewer.
The content of the invention
In order to reduce the photo threshold that goes out of raman laser, light light efficiency is improved, the present invention provides a kind of with the confocal of seed light
Unsteady cavity Ramar laser.
The technical solution adopted by the present invention is a kind of confocal unstable resonator Ramar laser with seed light, and it, which includes, has
Two confocal unstable resonators of the light path that partially overlaps, both focuses overlap, and are respectively used to the starting of oscillation of pump light and Raman light.In order to
Pump light and Raman light are separated, uses dichroscope（Wave length beam splitting mirror）To realize the respective independent work of pump light and Raman light
Make.The focus of pump light is located inside Raman pond, can effectively produce Raman light, and forms raman laser vibration.Raman light
Laser exports eventually through the output coupling mirror with partial reflectance.
In order to reduce the energy and beam quality that go out photo threshold, improve raman laser of raman laser, laser has kind
Sub-light input system, it passes through a scraper mirror being arranged in Raman light light path（Hollow 45 ° of coupling mirrors）By Raman wavelength
Seed light inputs Raman optical cavity according to wave mode is swung to.
Confocal unstable resonator has magnifying power M, the two kinds of possible directional light light beams walked round about for intracavitary, its
As a result and differ, a kind of situation is that beam diameter vibrates M times of expansion every time, and another kind is each M times of diminution；During vibration, put down
Row light beam and focus on light beam alternate cycles occur., can be using diaphragm come oscillation mode in restricted room, compacting using this feature
The unstable pattern that light beam expands, the oscillation mode work for only allowing light beam to reduce.And scraper mirror is part-time as diaphragm and seed light
Loader.By an annular directional light Raman wavelength λ2Seed light is sent into optical cavity light path, induces λ in Raman light optical cavity2Laser is pressed
Vibrated according to the oscillation mode of seed light, while reduce oscillation threshold, improve Ramar laser power output（Namely improve and turn
Rate）.
A kind of confocal unstable resonator Ramar laser with seed light, including focal length concave mirror one, focal length concave mirror two, short focus
Concave mirror and dichroscope, by two kinds of effects of transmission and reflection of dichroscope, focal length concave mirror one and focal length concave mirror two
Confocal unstable resonator all is formed with short focus concave mirror, and light path overlaps between dichroscope and short focus concave mirror；
Put successively on the straight line main optical path where the axis of short focus concave mirror dichroscope, scraper mirror, Raman pond and
Short focus concave mirror；
Focal length concave mirror two or focal length concave surface are provided with transmitted light path of the dichroscope away from short focus concave mirror side
Mirror one；Accordingly, focal length concave mirror one or focal length are provided with the reflected light path of short focus concave mirror side in dichroscope
Concave mirror two；
Pumping optical gain medium is provided with light path between focal length concave mirror one and dichroscope；
Raman pond is provided between short focus concave mirror and dichroscope, two optical windows of Raman pond are respectively for dichroic
Mirror and short focus concave mirror；
Scraper mirror is provided between the dichroscope and Raman pond, the side of scraper mirror is provided with seed light input mirror.
The dichroscope is high to the light as caused by pumping optical gain medium thoroughly, to high anti-through light caused by Raman pond；Institute
State short focus concave mirror and focal length concave mirror one and place the side of dichroscope two respectively, short focus concave mirror is coaxially set with focal length concave mirror one
Put.
Or the dichroscope is high to the light as caused by pumping optical gain medium anti-, to high through light caused by Raman pond
Thoroughly；The short focus concave mirror and focal length concave mirror two place the side of dichroscope two, short focus concave mirror and focal length concave mirror two respectively
It is coaxially disposed.
The focal length concave mirror one, the focal length of focal length concave mirror two are identical, and are the 1.2-1.8 of short focus concave mirror focal length
Times.
The pumping optical gain medium, which is placed in one, to be had in pumping wavelength and the transparent window container of Raman wavelength.
The light of focal length concave mirror one is pointed into after its reflection parallel to the axis of focal length concave mirror one, through dichroscope or warp
After dichroscope reflection, the first focus is converged at；The light of focal length concave mirror two is pointed into through it parallel to the axis of focal length concave mirror two
After reflection, after dichroscope reflects or is reflected through dichroscope, the second focus is converged at；First focus and the second focus
Overlap, and in Raman pond；The focus of short focus concave mirror overlaps with the first focus and the second focus；The short focus concave mirror pair
Be all-trans by the directly caused light of pumping optical gain medium, to as caused by Raman pond light transmission rate between 40-50%.
Dichroscope is presented opposite transmissivity for [pumping optical gain medium] and the operation wavelength of Raman pond, i.e., one
Wavelength high-transmission rate, another wavelength high-reflectivity.
Scraper mirror is provided between the dichroscope and Raman pond, the side of scraper mirror is provided with seed light input mirror；Light
Through dichroscope or after dichroscope reflects after seed light input mirror is irradiated to scraper mirror close to the side of dichroscope,
Focal length concave mirror two is pointed into parallel to the axis of focal length concave mirror two.
The axis of the short focus concave mirror overlaps with scraper mirror centre bore axis, and scraper mirror center-hole diameter is not more than focal length
The diameter of concave mirror two.
Seed light input mirror pair is high anti-with the light of identical frequency caused by pumping optical gain medium, pair and through Raman pond
The light of caused identical frequency is high thoroughly.
It is placed with methane, ethane in the Raman pond, ethene, hydrogen, oxygen, nitrogen, one kind or several in carbon dioxide
The mixture of kind.
It is an advantage of the invention that as a result of seed light injection and the directly axial pumping Raman medium of pumping optical standing wave, drop
Low Ramar laser goes out photo threshold, improves Ramar laser power output.
The invention discloses a kind of confocal unstable resonator Ramar laser with seed light input, including share short focus speculum
The confocal unstable resonator one and two of sidepiece path-splitting, it is corresponding to produce pump wavelength respectively1With Raman wavelength λ2Vibration, using dichroic
Mirror realizes that two pump lights and Raman light have public focus in respective optical cavity interior resonance, two optical cavities, and Raman pond is placed on
Public focus, it is λ fully to receive wavelength1Pump light come to produce wavelength be λ2Raman light；Worked simultaneously using confocal unstable resonator
Feature, using seed light is sent into confocal unstable resonator corresponding to scraper mirror to Raman light two, realize lower excited Raman threshold value and
Higher raman laser output.
Brief description of the drawings：
Fig. 1 is one of Ramar laser index path, wherein：1- focal length concave mirror one, 2- pumping optical gain mediums, 3- bis- to
Look mirror, 4- scraper mirrors, 5- Raman ponds, 6- short focus concave mirrors, 7- focal length concave mirror two, 8- seed lights input mirror；
Fig. 2 is the two of Ramar laser index path, wherein：1- focal length concave mirror one, 2- pumping optical gain mediums, 3- bis- to
Look mirror, 4- scraper mirrors, 5- Raman ponds, 6- short focus concave mirrors, 7- focal length concave mirror two, 8- seed lights input mirror.
Embodiment：
The present invention is further described with reference to the accompanying drawings and examples.
Embodiment one
As shown in Figure 1：
A kind of confocal unstable resonator Ramar laser with seed light, including it is focal length concave mirror 1, focal length concave mirror 27, short
Burnt concave mirror 6 and dichroscope 3, it is characterised in that：
By two kinds of effects of the transmission of dichroscope 3 and reflection, focal length concave mirror 1 and focal length concave mirror 27 all with it is short
Burnt concave mirror 6 forms confocal unstable resonator, and light path overlaps between dichroscope 3 and short focus concave mirror 6；
Put dichroscope 3, scraper mirror 4, Raman pond successively on the straight line main optical path where the axis of short focus concave mirror 6
5 and short focus concave mirror 6；
Focal length concave mirror 27 is provided with transmitted light path of the dichroscope 3 away from the side of short focus concave mirror 6 or focal length is recessed
Face mirror 1；Accordingly, focal length concave mirror 1 is provided with the reflected light path of the side of short focus concave mirror 6 in dichroscope 3
Or focal length concave mirror 27；
Pumping optical gain medium 2 is provided with light path between focal length concave mirror 1 and dichroscope 3；
Be provided with Raman pond between short focus concave mirror 6 and dichroscope, two optical windows of Raman pond respectively for two to
Look mirror and short focus concave mirror 6；
Scraper mirror is provided between the dichroscope and Raman pond, the side of scraper mirror 4 is provided with seed light input mirror 8.
Preferably, it is optical axis one to define the optical axis of short focus concave mirror 6, and pump light and Raman light optical cavity magnifying power are 1.5, two
It is to be placed with one 45 degree of angles of optical axis to Look mirror 3, Raman pond 5 is hydrogen pond, and pumping optical gain medium 2 is Nd：YAG crystal, crystal
For a diameter of D of cylinder, axis of a cylinder overlaps optical axis one.
Further, the projection aperture of optical axis one of scraper mirror 4 is D/1.5, and placement location does not surpass in the focus left side, distance focal point
The distance of overfocus and short focus concave mirror 6, prevent from unnecessarily blocking the oscillation light in optical cavity；
Further, Nd：YAG optical cavity one in 1064nm starting of oscillations, the Raman light frequency 1900nm of hydrogen in the starting of oscillation of optical cavity two,
Short focus concave mirror 6 exports to wavelength 1900nm with 30% coupling, and dichroscope 3 is to 1064nm high transmittances, to 1900nm height
Reflectivity.
Further, seed light inputs mirror 8 to 1064nm high reflectances and to 1900nm high-transmission rates, focal length concave mirror 1
To 1064nm high reflectances, 27 pairs of 1900nm high reflectances of focal length concave mirror, scraper mirror 4 is all high anti-to 1064nm, 1900nm
Penetrate rate.
Specifically, when implementing pumping to pumping optical gain medium 2, then formed in focal length concave mirror 1, short focus concave mirror 6
Confocal unstable resonator one in 1064nm light starting of oscillations, due to the limitation of scraper mirror 4, the pattern of the gradual enlarged-diameter of light beam is unable to work
Make, but to vibrate the pattern starting of oscillation that beam diameter reduces M=1.5 times every time, it is most strong in focal point light intensity.1064nm light actions
In Raman pond, the transmitting of 1900nm Raman lights is produced；Due to the presence of dichroscope 3, in focal length concave mirror 1, short focus concave mirror 6
1900nm is unable to starting of oscillation in the confocal unstable resonator one of composition, then, in focal length concave mirror 27, dichroscope 3, short focus concave mirror 6
In the folded form confocal unstable resonator of composition, 1900nm starting of oscillations, starting of oscillation pattern is the same, due to the presence of scraper mirror 4, only allows light beam
The oscillation mode of reduced diameter occurs, and couples output 1900nm laser by short focus concave mirror 6.And work as and use seed light
1900nm, drops it into the lower section of seed light input mirror 8, and output diameter is not less than D collimated light beam, mirror is inputted by seed light
The light path of 8 to scraper mirror 4 is irradiated, and seed light is not stopped after being focused on by focal length concave mirror 27 by scraper mirror 4, smoothly into confocal
The light path of unsteady cavity two, short focus concave mirror 6 is divergently reached again after Raman pond 5 forms focus, after the reflection of short focus concave mirror 6
As directional light, and the centre bore of scraper mirror 4, reflexed to the left by Raman pond 5 by dichroscope 3 up to focal length concave mirror two
7；Which forms the diminishing oscillation mode of light beam that an external world forces, and promotes Raman light optical cavity starting of oscillation, reduces
1900nm goes out photo threshold, increases Ramar laser power output.
Embodiment two
Other change Raman pool gas into methane only, then can realize that 1543nm wavelength exports, be somebody's turn to do with embodiment one
Wavelength is important communication wavelength, and to the safe wavelength of human eye, while marine efficiency of transmission is higher.
Embodiment three
Exchanged when by the position of the chamber one/bis- in embodiment one, that is, that pumping optical gain medium 2 is moved into focal length is recessed
Between face mirror 27 and dichroscope 3, the Transflective wavelength reversion of simultaneous selection dichroscope 3, embodiment three is formed,
Pump light optical cavity is refrative cavity, and Raman light optical cavity is line chamber, and such conversion is only conversion geometrically, and not shadow
The operation principle of Ramar laser is rung, its operation principle is still identical with embodiment one.
Example IV
Hysteroscope short focus concave mirror 6 is changed to have transmitance to 1064nm and 1900nm, adjusts intensity by figure with embodiment one
For similar 1064nm, 1900nm according to optical output is overlapped, such twin wavelength laser output is expected have its application, such as can carry out
Hydrogen coherent signal is tested, or the other kinds of experiment for needing dual-wavelength laser.
Above-described embodiment is simply to illustrate that the technical characterstic of the present invention, in order to makes those skilled in the art easy
Ground understands present invention, it is impossible to therefore the limitation scope of the present invention, the equivalence changes that every present invention is made, also fall
Within the scope of the present invention.
Claims (10)
1. a kind of confocal unstable resonator Ramar laser with seed light, including focal length concave mirror one（1）, focal length concave mirror two（7）、
Short focus concave mirror（6）And dichroscope（3）, it is characterised in that：
Pass through dichroscope（3）Transmission and reflection two kinds effect, focal length concave mirror one（1）With focal length concave mirror two（7）All with
Short focus concave mirror（6）Confocal unstable resonator is formed, and in dichroscope（3）With short focus concave mirror（6）Between light path overlap；
In short focus concave mirror（6）Axis where straight line main optical path on put dichroscope successively（3）, scraper mirror（4）, Raman
Pond（5）With short focus concave mirror（6）；
In dichroscope（3）Away from short focus concave mirror（6）Focal length concave mirror two is provided with the transmitted light path of side（7）Or focal length
Concave mirror one（1）；Accordingly, in dichroscope（3）Close to short focus concave mirror（6）It is recessed that focal length is provided with the reflected light path of side
Face mirror one（1）Or focal length concave mirror two（7）；
In focal length concave mirror one（1）With dichroscope（3）Between light path on be provided with pumping optical gain medium（2）；
Short focus concave mirror（6）Raman pond is provided between dichroscope, two optical windows of Raman pond are respectively for dichroic
Mirror and short focus concave mirror（6）；
Scraper mirror, scraper mirror are provided between the dichroscope and Raman pond（4）Side be provided with seed light input mirror（8）.
2. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：
The dichroscope is high to the light as caused by pumping optical gain medium thoroughly, to high anti-through light caused by Raman pond；It is described short
Burnt concave mirror（6）With focal length concave mirror one（1）The side of dichroscope two, short focus concave mirror are placed respectively（6）With focal length concave mirror one
（1）It is coaxially disposed；
Or the dichroscope is high to the light as caused by pumping optical gain medium anti-, to high thoroughly through light caused by Raman pond；Institute
State short focus concave mirror（6）With focal length concave mirror two（7）The side of dichroscope two, short focus concave mirror are placed respectively（6）With focal length concave surface
Mirror two（7）It is coaxially disposed.
3. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：
The focal length concave mirror one（1）, focal length concave mirror two（7）Focal length it is identical, and be short focus concave mirror（6）Focal length
1.2-1.8 again.
4. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：
The pumping optical gain medium（2）Being placed in one has in pumping wavelength and the transparent window container of Raman wavelength.
5. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：
Parallel to focal length concave mirror one（1）Axis is pointed into focal length concave mirror one（1）Light after its reflection, through dichroscope or
After dichroscope reflects, the first focus is converged at；Parallel to focal length concave mirror two（7）Axis is pointed into focal length concave mirror two（7）
Light after its reflection, reflected through dichroscope or through after dichroscope, converge at the second focus；First focus and second
Focus overlaps, and in Raman pond；Short focus concave mirror（6）Focus overlapped with the first focus and the second focus；The short focus
Concave mirror（6）To being all-trans by the directly caused light of pumping optical gain medium, to as caused by Raman pond light transmission rate in 40-50%
Between.
6. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：
Dichroscope（3）For pumping optical gain medium（2）And Raman pond（5）Operation wavelength opposite transmissivity is presented, i.e.,
One wavelength high-transmission rate, another wavelength high-reflectivity.
7. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：The dichroic
Scraper mirror is provided between mirror and Raman pond, the side of scraper mirror is provided with seed light input mirror；Light is through seed light input mirror irradiation
To scraper mirror behind the side of dichroscope through dichroscope or after dichroscope reflects, parallel to focal length concave mirror two
（7）Axis be pointed into focal length concave mirror two（7）.
8. the confocal unstable resonator Ramar laser according to claim 5 with seed light, it is characterised in that：The short focus is recessed
Face mirror（6）Axis overlapped with scraper mirror centre bore axis, scraper mirror center-hole diameter is not more than focal length concave mirror two（7）It is straight
Footpath.
9. the confocal unstable resonator Ramar laser according to claim 5 with seed light, it is characterised in that：The seed light
It is high instead to input the light of mirror pair and identical frequency caused by pumping optical gain medium, pair with the light through identical frequency caused by Raman pond
It is high saturating.
10. the confocal unstable resonator Ramar laser according to claim 1 with seed light, it is characterised in that：The Raman
It is placed with methane, ethane in pond, ethene, hydrogen, oxygen, nitrogen, one or more of mixtures in carbon dioxide.
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| US5434882A (en) * | 1994-04-12 | 1995-07-18 | The United States Of America As Represented By The United States Department Of Energy | Injection-controlled laser resonator |
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2014
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Patent Citations (6)
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|---|---|---|---|---|
| US4144464A (en) * | 1978-01-25 | 1979-03-13 | The United States Of America As Represented By The United States Department Of Energy | Device and method for noresonantly Raman shifting ultraviolet radiation |
| US4327337A (en) * | 1980-01-03 | 1982-04-27 | General Electric Company | Intracavity raman frequency conversion in a high power laser |
| US4933943A (en) * | 1987-10-02 | 1990-06-12 | Hughes Aircraft Company | Intracavity Raman cell resonator |
| US5251221A (en) * | 1992-08-10 | 1993-10-05 | Hughes Aircraft Company | Self aligning intracavity Raman laser |
| DE4311454A1 (en) * | 1993-04-07 | 1994-10-13 | Zeiss Carl Fa | Raman laser |
| US5434882A (en) * | 1994-04-12 | 1995-07-18 | The United States Of America As Represented By The United States Department Of Energy | Injection-controlled laser resonator |
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| Injection Seeding of a high-energy photolytically-pumped I* laser;A.J.W. Brown等;《Proceedings of SPIE》;20001231;第4065卷;第667页第4段至第670页第1段、图2 * |
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