CN106911057B - A kind of lightweight compact optical parametric oscillator - Google Patents

A kind of lightweight compact optical parametric oscillator Download PDF

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Publication number
CN106911057B
CN106911057B CN201710187259.5A CN201710187259A CN106911057B CN 106911057 B CN106911057 B CN 106911057B CN 201710187259 A CN201710187259 A CN 201710187259A CN 106911057 B CN106911057 B CN 106911057B
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annular chamber
nonlinear crystal
crystal
plano
temperature controlling
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CN106911057A (en
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谢臻达
刘奕辰
谢旭凯
杜正婷
贾琨鹏
祝世宁
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Nanjing University
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Nanjing University
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02Constructional details
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02Constructional details
    • H01S3/04Arrangements for thermal management
    • H01S3/0407Liquid cooling, e.g. by water

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

A kind of lightweight compact optical parametric oscillator device, including temperature controlling stove, annular chamber, optical fiber collimator, nonlinear crystal and structural member, the annular chamber are made of two plano-concave lens and two flat mirrors;The nonlinear crystal is placed between two plano-concave mirrors of annular chamber, and wherein concave surface is towards nonlinear crystal;Nonlinear crystal and annular chamber are combined into optical parametric oscillator;Pump light enters in annular chamber after the beam shaping of optical fiber collimator from the plane of the first plano-concave mirror, nonlinear effect is generated by nonlinear crystal, two plano-concave lens of annular chamber and two flat mirrors, four hysteroscope selections are high to ideler frequency light anti-, to ideler frequency light generation in annular chamber, thus output signal light;Nonlinear crystal is placed on temperature controlling stove, and temperature controlling stove dress is controllable in orbit mobile;There is water channel in the upper and lower cover plates of temperature control furnace apparatus, it is constant by flow cavitation result thermal field.

Description

A kind of lightweight compact optical parametric oscillator
Technical field
The present invention relates to laser technology and nonlinear frequency transformation field, especially a kind of optical parameter vibration based on annular chamber Swing device.
Background technique
The light that wave-length coverage is 0.75 micron to 1000 microns is known as infrared ray in spectroscopy, wherein generally by 3 to 20 The light of micron is known as mid-infrared light.The light of this wave band has many characteristics, especially 3 to 5 micron wavebands, and the light of this wave band is in atmosphere It is lost lower when middle transmission, is highly important atmosphere infrared window;Except this, which also covers many hydrocarbon gas and its The absorption peak of his many toxic gases.Therefore the laser of the wave band can be used for directional ir interference, laser ranging, spectrum point Analysis, atmosphere pollution monitoring, poisonous gas detection etc..
The mode of acquisition mid-infrared laser substantially has following several at present: gas laser, quantum cascade laser, two poles The optical parametric oscillator (OPO) of pipe laser, solid state laser and its pumping light, wherein with the solid as OPO pumping source The fast development of laser and optical fiber laser, the emergence of new nonlinear crystals measured material, mid infrared laser obtain Major progress becomes the important means for obtaining mid-infrared laser output.
Optical parametric oscillator has many advantages when generating laser output: tuning range extensively, is not constrained by pump wavelength; A variety of nonlinear crystals, and tuning manner multiplicity, including thermal tuning, period tuning, angle tuning etc. can be used;Structure is tight Gather, can all solidstate, system stability enhancing;High-power, high light beam quality, narrow linewidth output etc. can be achieved.
OPO technology just had also been proposed early in 1962, and theory is constantly improve, and was experimentally limited to pumping source and non-thread Property crystal, is difficult have important breakthrough always.Until the eighties in last century, match the crystal of (BPM) with based on birefringent position Appearance and semiconductor pump all solid state laser development, OPO technology has very big breakthrough.
What is grown up the nineties in last century is matched the optical super lattice material of (QPM) technology based on level, such as period Polarized lithium tantalate (PPLT), lithium niobate (PPLN), mg-doped lithium niobate (PPMgO:LN), potassium titanium oxide phosphate etc. have light transmission model The advantage wide, effective second order nonlinear coefficient is big, absorption loss is small, optic damage threshold value is high is enclosed, OPO technology has been pushed to one New height.
Annular cavity optical parametric oscillation method is to obtain one of the method for high-power mid-infrared laser, at present mid-infrared laser device It is commonly duralumin, the metal materials such as steel.When exporting laser, the savings of heat can make metal material that thermal deformation, metal occur in this way Thermal deformation pump laser beam can be made to change by the position of crystal, thus to output laser wavelength power generate shadow It rings, is unable to reach the optical requirement of associated laser application field such as probe gas, in addition to this, universal mid-infrared laser device light System is cumbersome, the volume and weight of this laser also increased to a certain extent, and the application of laser outside middle row is pushed away Extensively bring obstruction.
Summary of the invention
The problem to be solved in the present invention: the deficiency of application conditions and existing product parameter for mid-infrared laser is set out, The present invention provides a kind of completely new optical parametric oscillators, from the selection of material and component, make leather in optical system adjustment New property is improved, and solves the low stability output of existing OPO frequency-converted solid state laser, volume is big, the big technological deficiency of weight.
To solve the above problems, the invention adopts the following technical scheme: a kind of lightweight compact optical parametric oscillator fills It sets, it is characterised in that: including temperature controlling stove, annular chamber, optical fiber collimator, nonlinear crystal and structural member, the annular chamber is by two Plano-concave lens and two flat mirrors are constituted;The nonlinear crystal is placed between two plano-concave mirrors of annular chamber, and wherein concave surface is towards non- Linear crystal;Nonlinear crystal and annular chamber are combined into optical parametric oscillator;Pump light passes through the beam shaping of optical fiber collimator Enter in annular chamber from the plane of the first plano-concave mirror afterwards, nonlinear effect, two plano-concaves of annular chamber are generated by nonlinear crystal Lens and two flat mirrors, four hysteroscope selections are high to ideler frequency light anti-, to ideler frequency light generation in annular chamber, thus output signal light;It is non- Linear crystal is placed on temperature controlling stove, and temperature controlling stove dress is controllable in orbit mobile;There is water in the upper and lower cover plates of temperature control furnace apparatus Road, it is constant by flow cavitation result thermal field.
Temperature controlling stove is connected by bearing with connecting rod with external steering engine, and steering engine control temperature controlling stove is moved one-dimensionally in orbit.
The optical fiber collimator is bonded in carbon fiber plate after debugging beam path alignment, on structural member, constitutes single unit system A part, single unit system material are bonded for carbon fiber board.The control system of temperature controlling stove is equipped with temperature feedback arrangement.
The nonlinear crystal is periodic polarized lithium tantalate, lithium columbate crystal, magnesium-doped lithium niobate crystal or phosphorus One of sour titanyl potassium crystal;The above crystal be based on level match principle realize frequency conversion nonlinear crystal.
The eyeglass of hysteroscope is half inch of eyeglass, and eyeglass is in the suitable rear directly high-intensitive mucilage binding of debugging in the carbon as structural member On fine plate.
Temperature controlling stove is connected by bearing with connecting rod with external steering engine, and then controls temperature controlling stove one-dimensional movement.
Further, in the present invention, temperature controlling stove has water channel in the upper and lower cover plates of device, passes through flow cavitation result thermal field It is constant, the influence of the factors such as extraneous thermal field is reduced, environmental suitability is higher.
Beneficial effect, the present invention is prepared into a kind of small-sized completely new optical parametric oscillator of high stability, from material and portion Innovative improvement is made in the selection of part and optical system adjustment, it is defeated to solve the low stability of existing OPO frequency-converted solid state laser Out, volume is big, the big technological deficiency of weight, stablizes convenient for being prepared into product and the at low cost, performance of commercial applications.It is described whole The material of body device is carbon fibre materials.It is demonstrated experimentally that the present invention finally obtains high efficiency, the continuous laser of high stable is exported, And single unit system is light, it is small in size.
Detailed description of the invention
The schematic diagram of Fig. 1, annular cavity optical parametric oscillator (opo) vertical direction;
Fig. 2, optical fiber collimator schematic diagram;
Fig. 3, channel control system schematic diagram;
Fig. 4, the perspective view for Fig. 1.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, a kind of lightweight high stability compact optical parametric oscillator, including four hysteroscopes L1-L4, LI- Straight line between L4 indicates optical path;Temperature controlling stove 5, optical fiber collimator 3, channel control system 7.The material of the device is carbon fiber material Material, structure are that 13 pieces of carbon fiber plate high intensity gluings form.Hysteroscope in OPO is directly glued on device, compact-sized, optics Performance is stablized, and OPO size had both been device size.
Annular chamber 6 is directly selected same big gadget by apparatus of the present invention, and with the same size of the size of shell;Four chambers Mirror eyeglass is small eyeglass (4 indicate i.e. in figure) adhesion clamping;The commercial electronic facility 2 of modification applies to apparatus of the present invention;Using light Fine collimator 3 directly pumps, and temperature controlling stove 5 controls frequency-changer crystal temperature.
Optical parametric oscillator integral structure component is that the mutually high-intensitive gluing of carbon fiber plate 1 forms.Single unit system is the double-deck knot Structure keeps structural stability higher by carbon fibre tube glue stays between two layers.
Optical fiber collimator, four hysteroscope devices eyeglass be half inch of eyeglass, eyeglass is directly high-intensitive after debugging is suitable Mucilage binding is in carbon fiber plate.
Temperature controlling stove 5 is mounted on the sliding rail on first layer floor of device, one-dimensional can be slided;Control system has temperature feedback dress It sets, furnace can be made invariable.It is that electronic facility 2 is commercial cheap steering engine, suitably modified steering engine, and pass through axis It holds, connecting rod carries out one-dimensional adjusting to temperature controlling stove.The control system for avoiding stepper motor complexity increases to device volume bring.
The present invention newly designs optical plan, abandons the optical mode for adding lens using commercial collimator.Utilize independent development Optical fiber collimator 3 directly collimate the light into inject annular chamber in.Greatly reduce single unit system size.
Temperature control drop-bottom, device lower floor upper plate have water channel, it is cooling to carry out water to whole system by hose, Stablize internal thermal field, improves environment anti-interference.
As shown in Figure 1, the New Ring-like Type device optical parametric oscillator uses annular chamber, the oscillator is by homemade fiber optic collimator Device directly squeezes into the collimated light that commercial laser is collimated into certain size with a tight waist in OPO, controls the position of light collimator Make with a tight waist positioned at germ nucleus.L1, L2 are plano-concave lens, and concave surface is once passing through 1 Shi Huifa of crystal towards 1. pump light of crystal Raw nonlinear optical process generates ideler frequency light and signal light.To make to obtain signal light amplification output, L1, L2, L3, L4 are to ideler frequency light High anti-, L2, L3, L4 are high to signal light anti-, and L1 signal light is high thoroughly.With this ideler frequency light can in annular chamber multiple oscillation, and signal Light can then export at L1, to realize the amplification output of signal light.
As shown in Fig. 2, being the perspective view of optical fiber collimator, by ceramic insertion core 3.1, inner sleeve 3.2, outer tube 3.3, aspheric Face mirror 3.4 forms.OPO has certain requirement to the size of center spot, so general laser is frequently with preceding focus Lens convergence, this considerably increases light paths, that is, increase integrally-built length.The present invention is big by hot spot needed for calculating OPO Small is 100 μm or so, selects the aspherical mirror 3.4 of small focal length, among the optical fiber insertion lock pin 3.1 of pump laser, then will Laser alignment is exported at a distance from lock pin by controlling aspherical mirror among lock pin insertion inner sleeve 3.2.Internal and external casing can revolve Turn, it is therefore an objective to which the polarization of adjustable laser, when being adjusted to polarize vertically, mucilage binding is fixed.
The laser wavelength that OPO is generated can be adjusted by control nonlinear crystal temperature small range, and controlled laser and squeezed into crystalline substance The different channels of body can realize a wide range of adjusting, and when by crystal non-linear process occurs for laser, part energy can be with heat Form come out.And the ideler frequency optical wavelength that non-linear process exports at different temperature is also different.Therefore as schemed 1, crystal is arranged on temperature controlling stove 5, makes the temperature timing constant of crystal.In wide range of wavelengths regulation problem, must be requested that temperature Control furnace can one-dimensional smooth movement, the present invention selects small-sized and cheap steering engine to control temperature controlling stove.
As shown in figure 3, for the perspective view of the channel control system 7 in Fig. 1.Temperature controlling stove 5 is placed on sliding rail 8, temperature controlling stove And bearing and connecting rod are connected on steering engine respectively, the translation for being converted into temperature controlling stove of steering engine can be completed the choosing in channel with this It selects.
It should be understood by those ordinary skilled in the art that: the above is only a specific embodiment of the present invention, and It is not used in the limitation present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done, It should be included within protection scope of the present invention.

Claims (3)

1. a kind of lightweight compact optical parametric oscillator device, which is characterized in that including temperature controlling stove, annular chamber, fiber optic collimator Device, nonlinear crystal and structural member, the annular chamber are made of two plano-concave lens and two flat mirrors;The nonlinear crystal is placed in Between two plano-concave mirrors of annular chamber, wherein concave surface is towards nonlinear crystal;Nonlinear crystal and annular chamber are combined into optical parameter vibration Swing device;Pump light enters in annular chamber after the beam shaping of optical fiber collimator from the plane of the first plano-concave mirror, by non-thread Property crystal generate nonlinear effect, the selection of four hysteroscopes of two plano-concave lens of annular chamber and two flat mirrors is high to ideler frequency light anti-, in ring Shape is intracavitary to ideler frequency light generation, thus output signal light;Nonlinear crystal is placed on temperature controlling stove, and temperature controlling stove dress in orbit may be used Control movement;There is water channel in the upper and lower cover plates of temperature control furnace apparatus, it is constant by flow cavitation result thermal field;
Temperature controlling stove is connected by bearing with connecting rod with external steering engine, and steering engine control temperature controlling stove is moved one-dimensionally in orbit;
The optical fiber collimator is bonded in carbon fiber plate after adjusting beam path alignment, on structural member, constitutes one of single unit system Point, single unit system material is bonded for carbon fiber board;The nonlinear crystal is periodic polarized lithium tantalate, niobic acid One of crystalline lithium, magnesium-doped lithium niobate crystal or potassium titanyl oxygenic phosphate(KTP) crystal;The above crystal is to be matched principle based on level Realize the nonlinear crystal of frequency conversion;
Oscillator single unit system is double-layer structure, by carbon fibre tube glue stays between two layers, under temperature control drop-bottom, double-layer structure There is water channel on floor, upper plate, and water channel is hose laying, carry out water cooling to whole system by hose, make internal temperature Stablize field;
Optical fiber collimator is by concentric ceramic insertion core, inner sleeve, outer tube, aspherical mirror composition;By the light of pump laser Among fibre insertion lock pin, then lock pin is inserted among inner sleeve makes laser alignment defeated by controlling aspherical mirror at a distance from lock pin Out;Internal and external casing can rotate.
2. oscillator arrangement according to claim 1, which is characterized in that the control system of temperature controlling stove is filled equipped with temperature feedback It sets.
3. oscillator arrangement according to claim 1, it is characterised in that: eyeglass is half inch of eyeglass, and eyeglass is closed in debugging Directly high-intensitive mucilage binding is in the carbon fiber plate as structural member after suitable.
CN201710187259.5A 2017-03-27 2017-03-27 A kind of lightweight compact optical parametric oscillator Active CN106911057B (en)

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Publication number Priority date Publication date Assignee Title
CN111509548A (en) * 2020-04-02 2020-08-07 北京航天控制仪器研究所 Narrow-linewidth intermediate infrared laser with tunable wavelength

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US8908738B2 (en) * 2010-10-01 2014-12-09 Physical Sciences, Inc. Ring resonator with a holographic reflector
CN105680309A (en) * 2016-04-06 2016-06-15 南京大学 Compact-structure picosecond pulse wide-tuning mid-infrared laser
CN205656342U (en) * 2016-04-08 2016-10-19 福建天蕊光电有限公司 Optical fiber adapter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101505029A (en) * 2008-02-04 2009-08-12 北京中视中科光电技术有限公司 Laser and heat radiation device
US8908738B2 (en) * 2010-10-01 2014-12-09 Physical Sciences, Inc. Ring resonator with a holographic reflector
CN105680309A (en) * 2016-04-06 2016-06-15 南京大学 Compact-structure picosecond pulse wide-tuning mid-infrared laser
CN205656342U (en) * 2016-04-08 2016-10-19 福建天蕊光电有限公司 Optical fiber adapter

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基于光学超晶格可用于气体探测的中红外光学参量振荡器;刘奕辰;《中国优秀硕士学位论文全文数据库信息科技辑》;20161015;正文第三、四章 *

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