CN2433645Y - Temperature control amplifying device for weak light pulse intensity - Google Patents

Abstract

A temperature control amplifying device for weak light pulse intensity. The signal light beam and the pumping light beam with shorter wavelength and stronger light intensity than the pump light beam are simultaneously transmitted through the incident window of the refrigerating cavity and then emitted into the amplifying element. Since the temperature change is Δ T =0 when the amplification element is constantly at a constant temperature in the refrigerator, the frequency of the signal beam amplified by the amplification element changes by Δ ω = 0. At the same time, a stretcher is arranged on the optical path between the signal light source and the amplifying element, so that finally, stable amplification 10 with stretched pulse width is obtained²⁸Multiple signal beams.

Description

The temperature control multiplying arrangement of low light level pulse strength

The utility model is a kind of temperature control multiplying arrangement of low light level pulse strength.Be mainly used to amplify the light intensity of low light level signal and keep amplifying signal stable.

Formerly inventor such as metal and stone fine jade provides a kind of optical parametric amplifier in the technology in patented claim CN1258016A, comprise that most crucial element is an amplifier element, place the plane of incidence of amplifier element before signal optical source and pump light source to be arranged, signal optical source and pump light source are connected with same isochronous controller.Place the exit facet of amplifier element afterwards first detector and second detector to be arranged, the output of first detector and second detector is connected on the data processing display simultaneously.

Signal optical source 1 and pump light source 2 are both and constitute with laser instrument.The pump light G of pump light source 2 emissions _pWavelength X _pFlashlight G less than the signal optical source emission _sWavelength X _s, i.e. λ _p＜λ _sAnd pump light G _pLight intensity I _pMust be greater than flashlight G _sLight intensity I _s, i.e. I _p＞I _s

Pump light G _pWith flashlight G _sBy isochronous controller control, must enter in the amplifier element simultaneously.

Owing to constitute the coupling effect of the nonlinear crystal of amplifier element, make (low light level) signal beams G in the multiplying arrangement of said structure _sObtain amplifying.Though this multiplying arrangement is simple and enlargement ratio is high, the amplifying signal instability uses difficulty.

The purpose of this utility model provides a kind of light intensity of weak pulsed laser signal can the amplification can stablize the temperature control multiplying arrangement that amplifying signal light and light impulse length are the low light level pulse strengties of process broadening again.Structure will be both simple, again operation easily.

Multiplying arrangement of the present utility model as shown in Figure 1, comprises, most crucial element is an amplifier element 4, and amplifier element 4 is to place in the refrigeration chamber 901 of temperature controller 9.Signal optical source 1 and pump light source 2 are by same isochronous controller 3 controls.Be equipped with stretcher 8 on the light path between signal optical source 1 and the amplifier element 4.The light pulse G that launches through stretcher 8 behind the signal optical source 1 _sLight pulse G with pump light source 2 _pBoth are with optical axis O ₁O ₁With O ₂O ₂Between angle α ≠ 0 enter on the plane of incidence γ of amplifier element 4 by the incidence window 9010 of temperature controller 9 simultaneously.Place the exit facet C of amplifier element 4 and the outgoing window 907 in temperature controller 9 refrigeration chambeies 901 to have the output of first detector 5 and second detector, 6, the first detectors 5 and second detector 6 to be connected to simultaneously on the data processing display 7 afterwards.

Said temperature controller 9 contains brings the refrigeration chamber 901 of penetrating window 9010 and outgoing window 907 into.Be distributed with the flow liquid passage 908 of liquid coolant in the chamber wall 909 in refrigeration chamber 901, flow liquid passage 908 has inlet 904 and the liquid outlet 905 that leads to outside the chamber wall 909.Have feed liquor switch 903 on the inlet 904, feed liquor switch 903 with have the temperature detect switch (TDS) 902 that puts in the thermal detector 906 in the refrigeration chamber 901 and link to each other, as shown in Figure 1 and Figure 2.

Temperature variation in the said refrigeration chamber 901 are to lead on the temperature detect switch (TDS) 902 after the temperature that records at any time by thermal detector 906, by the Push And Release of temperature detect switch (TDS) 902 control feed liquor switches 903.That is to say that when the temperature in thermal detector 906 measures refrigeration chamber 901 raise, temperature detect switch (TDS) 902 was opened feed liquor switch 903 at once, the flow liquid passage 908 of liquid coolant in being distributed in chamber wall 909 taken away the heat in the refrigeration chamber 901, beginning refrigeration.When temperature dropped to desired temperature, then temperature detect switch (TDS) 902 cut out feed liquor switch 903 again, stopped refrigeration.All the time be in temperature constant state in the refrigeration chamber 901.So that place the amplifier elements 4 in the refrigeration chamber 901 to remain under the temperature constant state.Even as pump beam G _pWith signal beams G _sInjecting by the incidence window (9010) of refrigeration chamber (901) simultaneously makes amplifier element 4 temperature raise in the amplifier element 4, its heat will be taken away by the liquid coolant of 908 li of flow passages in the 901 chamber walls 909 of refrigeration chamber at any time, thereby amplifier element 4 is remained under the constant temperature, then temperature variation Δ T=0.Can also be equipped with the semi-conductor array element in the chamber wall 909 in the above-mentioned refrigeration chamber 901 is conductor refrigeration.

The incidence window 9010 in said refrigeration chamber 901 and outgoing window 907 are to see through signal beams G simultaneously _sWith pump beam G _pThe planar lens that is coated with anti-reflection film, or Pneumatic air adjusting.

Said stretcher 8 mainly comprises blazed grating 801, convex reflecting mirror 802 and concave mirror 803,

As shown in Figure 3.

Said amplifier element 4 also is made of nonlinear crystal.Nonlinear crystal is a biaxial crystal, potassium titanyl oxygenic phosphate(KTP) crystal (KTP), or lithium triborate crystal in this way (LBO); Or uniaxial negative crystal, PDP crystal (KDP), or ammonium dihydrogen phosphate crystal in this way (ADP), or lithium columbate crystal (LiNO ₃), or β one barium metaborate crystal (BBO) etc.; Or positive uniaxial crystal, cadmium germanium arsenic crystal (CdGeAs in this way ₂) etc.

The laser instrument that constitutes signal optical source 1 and pump light source 2 is a solid state laser, or gas laser, or liquid laser.

First detector 5 and second detector 6 all are CCD diode array detectors, or photodiode, or photomultiplier.

Data processing display 7 is oscillographs, or computing machine, or operative installations.Isochronous controller 3 is made of chronotron.

Multiplying arrangement signal beams G of the present utility model _sAmplification process be known: as signal beams G by signal optical source 1 emission of isochronous controller 3 control _sThe pump beam G that behind stretcher 8 broadenings, launches with pump light source 2 _pSeeing through incidence window 9010 simultaneously incides in the amplifier element 4 that places 901 li in temperature controller 9 refrigeration chambeies, owing to constitute the coupling effect of the nonlinear crystal of amplifier element 4, signal beams Gs is amplified, two-beam by amplifier element 4 outputs, a branch of flashlight Gs that only is exaggerated, another Shu Guang is called idle light Gi.The gain amplifier of flashlight Gs in amplifier element 4 is: $G=1+{\left(\mathrm{yL}\right)}^2{\left(\frac{\sinh \left(B\right)}{B}\right)}^2\…\…\…\left(1\right)$ L is the crystal length as amplifier element 4.Wherein $B=\sqrt{{\left(\mathrm{yL}\right)}^2-{(\mathrm{\ΔkL}/2)}^2}\…\…\…\left(2\right)$ Wherein amplification coefficient γ is: $y={4\mathrm{\πd}}_{\mathrm{eff}}\sqrt{I_p/2{\mathrm{\ϵ}}_o{n}_p{n}_s{n}_{i}c{\mathrm{\λ}}_s{\mathrm{\λ}}_i}\…\…\…\left(3\right)$ (2) Δ k is the phase misalignment harmonic quantity in the formula, d in (3) formula _EffBe effective nonlinear coefficient as the crystal of amplifier element 4, I _pBe pump beam G _pIntensity, ε ₀Be permittivity of vacuum, n _pBe pump beam G _pRefractive index, n _sBe signal beams G _sRefractive index, n _iBe idle light G _iRefractive index, c is the light velocity, λ _sBe signal beams G _sWavelength, λ _iBe idle light G _iWavelength.

When light is propagated in the crystal as amplifier element 4, refractive index will change with variation of temperature, because the result of temperature variation causes signal beams G _sFrequency produce drift: Δ ω is signal beams G in the formula _sThe variation circular frequency, Δ T is the temperature variation numerical value of amplifier element 4, ω _pBe pump beam G _pFrequency, T is the temperature of amplifier element 4, ω _sBe signal beams G _sFrequency.

By above-mentioned (4) formula as can be seen variation of temperature to signal beams G _sThe influence of frequency change Δ ω be clearly, so, if do not take measures to make the temperature of amplifier element 4 to remain unchanged, then through the signal beams G of amplifier element 4 outputs _sObviously be unsettled.Therefore amplifier element 4 of the present utility model places in the temperature controller 9 refrigeration chambeies 901, when the temperature variation of amplifier element 4, at any time measure to temperature detect switch (TDS) 902 by the thermal detector 906 in the refrigeration chamber 901, Push And Release by temperature detect switch (TDS) 902 control feed liquor switches 903, amplifier element 4 is under the temperature constant state in the refrigeration chamber 901 all the time, be temperature variation Δ T=0, by (4) formula Δ ω=0 as can be known.So, be stable through the signal beams Gs after the amplification of amplifier element 4 outputs of the present utility model.

The advantage of the temperature control multiplying arrangement of low light level pulse strength of the present utility model:

Advantage of the present utility model is that the amplifier element 4 of multiplying arrangement of the present utility model is to place in the temperature controller 9 refrigeration chambeies 901, is under the constant temperature of optimum Working amplifier element 4, i.e. Δ T=0 all the time.So not only guarantee through the signal beams G after amplifier element 4 amplifications _s' frequency remain unchanged i.e. Δ ω=0, and make its enlargement ratio also than the enlargement ratio 10 of technology formerly ³Exceed twenties orders of magnitude and reach 10 ²⁸Doubly.And the utility model is equipped with stretcher 8, the signal beams G that makes signal optical source 1 emission on the light path between signal optical source 1 and the amplifier element 4 _sPulse width obtain broadening, so the signal beams G after amplifying through amplifier element 4 _s' be pulse width broadened after, this uses back level and amplifies to warbling particularly that to require the broad pulse width be quite favourable.

Description of drawings:

Fig. 1 is the structural representation of the temperature control multiplying arrangement of low light level pulse strength of the present utility model.

Fig. 2 is the A--A cut-open view of temperature controller 9 in the utility model multiplying arrangement among Fig. 1.

Fig. 3 is the structural representation of stretcher 8 in the temperature control multiplying arrangement of low light level pulse strength of the present utility model among Fig. 2.

Fig. 4 be embodiment in optical pulse parametric amplifier of the present utility model, when amplifier element 4 is biaxial crystal LBO, two-beam G _s, G _pWhen inciding amplifier element 4 plane of incidence γ, signal beams G _sThrough the gain of amplifier element 4 and the curve map of wave-number range relation.

Embodiment:

As Fig. 1, Fig. 2, device shown in Figure 3, signal optical source 1 is with argon (Ar) ion gas laser pumping solid ti sapphire laser output wavelength λ _sThe signal beams G of=1.064 μ m _s Pump light source 2 is that yttrium aluminum garnet (YAG) solid state laser is through frequency multiplication output wavelength λ _pThe pump beam G of=532nm _p, two pulse delay units of isochronous controller 3 usefulness constitute.Signal beams G behind process stretcher 8 broadenings of signal optical source 1 emission _sWith pump beam G _pInject in the amplifier element 4 pump beam G synchronously _pLight intensity I _p=3GMW/cm ², amplifier element 4 is twin shaft LBO nonlinear crystal (length L=13.5mm), signal beams G _sWith pump beam G _pTwo optical axis O ₁O ₁And O ₂O ₂Between angle α=0.005rad.When amplifier element 4 is twin shaft nonlinear crystal LBO cutting, guarantee signal beams G _sBe to flow through in θ=0.190rad. temperature controller 9 that the liquid coolant in the flow passage 908 is a water in the chamber wall 909 with an optical axis included angle wherein when in nonlinear crystal LBO, propagating.The incidence window 9010 in refrigeration chamber 901 and outgoing window 907 are to be coated with signal beams G _sWavelength X _s=1.064 μ m and to pump beam G _pWavelength X _pThe quartzy planar lens of the hafnium oxide anti-reflection film that=532nm can both see through.Signal beams G _sENERGY E _s=200pJ, amplification coefficient γ=2.5231 * 10 ³, gain G=1.8 * 10 ²⁸, the signal beams G after the amplification _s' ENERGY E _s'=3.6 * 10 ²¹J.Signal beams G _sIs 200ps through stretcher 8 afterpulse width by the 50fs broadening.Signal beams G after the amplification _s' can reach original signal beams G _s10 ²⁸Doubly.

Claims (3)

1. the temperature control multiplying arrangement of a low light level pulse strength: the plane of incidence (γ) that is included in core amplifier element (4) is equipped with pump light source (2) and the signal optical source (1) by same isochronous controller (3) control, the pump beam (G that pump light source (2) is launched before _p) wavelength X _pSignal beams (G less than signal optical source (1) emission _s) wavelength X _s, and pump beam (G _p) light intensity I _pGreater than signal beams (G _s) light intensity I _sWhile pump beam (G _p) and signal beams (G _s) two optical axis (O when inciding the plane of incidence (γ) of amplifier element (4) at the same time ₁O ₁, O ₂O ₂) angle α ≠ 0 arranged; Exit facet (C) in amplifier element (4) is equipped with first detector (5) and second detector (6) that is connected to simultaneously on the data processing display (7) afterwards, it is characterized in that amplifier element (4) is to place in the refrigeration chamber (901) of temperature controller (9); On the light path between signal optical source (1) and the amplifier element (4), be equipped with stretcher (8).

2. the temperature control multiplying arrangement of low light level pulse strength according to claim 1, it is characterized in that said temperature controller (9) contains brings the refrigeration chamber (901) of penetrating window (9010) and outgoing window (907) into, be distributed with the flow liquid passage (908) of liquid coolant in the chamber wall (909) in refrigeration chamber (901), flow liquid passage (908) has inlet (904) and the liquid outlet (905) that leads to outside the chamber wall (909), have feed liquor switch (903) on the inlet (904), feed liquor switch (903) with have the temperature detect switch (TDS) (902) that puts in the thermal detector (906) in the refrigeration chamber (901) and link to each other.

3. the temperature control multiplying arrangement of low light level pulse strength according to claim 1, it is characterized in that saidly placing that the stretcher (8) on the light path mainly comprises blazed grating (801) between signal optical source (1) and the amplifier element (4), convex reflecting mirror (802) and concave mirror (803).

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