CN105048280A - Stokes light source based on kalium titanyl arsenate crystal and working method and application of stokes light source - Google Patents
Stokes light source based on kalium titanyl arsenate crystal and working method and application of stokes light source Download PDFInfo
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- CN105048280A CN105048280A CN201510475040.6A CN201510475040A CN105048280A CN 105048280 A CN105048280 A CN 105048280A CN 201510475040 A CN201510475040 A CN 201510475040A CN 105048280 A CN105048280 A CN 105048280A
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Abstract
The invention relates to a stokes light source based on kalium titanyl arsenate crystal and a working method and an application of the stokes light source. The stokes light source comprises a pumping laser system, a stokes resonant cavity and a frequency-doubling system, wherein the stokes resonant cavity comprises kalium titanyl arsenate crystal, a rear cavity mirror of the resonant cavity and a stokes output mirror; pumping laser enters the stokes resonant cavity at a certain angle, and is emitted along the rear cavity mirror of the resonant cavity, the kalium titanyl arsenate crystal and the stokes output mirror; the stokes light source is formed by a scattering process of an excimer of the kalium titanyl arsenate crystal; tunable output of the stokes light can be realized by changing the angle at which the pumping light enters the stokes resonant cavity; and tunable stokes light within a range of (1077.88-1089.02)nm is obtained through angle tuning. The frequency-doubling system comprises frequency-doubling crystal and a light filter. Through frequency doubling of the stokes light source, a green light source within a range of (534-540)nm is obtained.
Description
Technical field
The present invention relates to a kind of Stokes light source based on arsenic acid titanyl potassium crystal and method of work thereof and application, belong to the technical field of infrared light supply.
Background technology
The tuning means of Stokes light source of prior art are complicated, and tunable range is narrow, if solid-state Raman laser is the wavelength tuning being realized stokes light by change pump wavelength and Raman crystal kind.Traditional lentor light source all needs cooling system to cool operation material mostly, complex structure, and the Stokes light source obtained not easily tuning, live width is wider.
In prior art, mostly arsenic acid titanyl potassium crystal is based on parametric oscillation or stimulated Raman scattering as the LASER Light Source of working media.Chinese patent CN101562311 discloses a kind of kalium titanyl arsenate (KTA) crystal solid-state self-frequency doubling yellow Raman laser, comprises laser diode pumping source, resonant cavity, and resonant cavity comprises Effect of Back-Cavity Mirror and outgoing mirror; It adopts one piece of KTA crystal to substitute Raman crystal and frequency-doubling crystal, places gain medium, Q-modulating device and KTA crystal in resonant cavity successively; The Raman realizing 1.06 microns of fundamental frequency light by KTA crystal changes the Raman light near acquisition 1.14 microns.
Chinese patent CN202050156 discloses a kind of 548.5nm full-solid state Raman laser.It comprises pumping source, coupled lens group, coupling cavity etc., place laser crystal, Raman crystal, Q-switching device, frequency-doubling crystal in coupling cavity, it obtains 548.5nm laser through frequency multiplication after using the 259cm-1 Raman frequency shift of YVO4 crystal to produce 1097nm optical maser wavelength; Input mirror M1, chamber mirror M2, outgoing mirror M3, laser crystal, Raman crystal and frequency-doubling crystal end face are coated with the deielectric-coating being greater than 96% to light transmission rate or the reflectivity of respective wavelength respectively.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of Stokes light source based on arsenic acid titanyl potassium crystal, utilize the exciton scattering process of being excited of arsenic acid titanyl potassium crystal to produce Stokes light source.
Present invention also offers the method for work of above-mentioned Stokes light source.The method achieve the tunable Stokes light output in 1077.88nm to 1089.02nm scope.
Present invention also offers the method for work that above-mentioned Stokes light source frequency multiplication obtains green glow.The green glow realized in 534nm to 540nm scope exports.
Technical scheme of the present invention:
Summary of the invention: the present invention relates to a kind of Stokes light source based on arsenic acid titanyl potassium crystal, comprise pumped laser system, Stokes resonant cavity and frequency doubling system, described Stokes resonant cavity comprises arsenic acid titanyl potassium crystal, the Effect of Back-Cavity Mirror of resonant cavity and Stokes outgoing mirror, the pumping laser that described pumped laser system sends enters Stokes resonant cavity with certain angle, along the Effect of Back-Cavity Mirror of resonant cavity, arsenic acid titanyl potassium crystal and the outgoing of Stokes outgoing mirror, the exciton scattering process of being excited of arsenic acid titanyl potassium crystal forms Stokes light source, the angle changing the incident Stokes resonant cavity of pump light can realize the tuning operation of stokes light, the tunable stokes light in 1077.88nm to 1089.02nm scope can be obtained by the mode of angle tuning.Described frequency doubling system comprises frequency-doubling crystal and filter, by the frequency multiplication to described Stokes light source, obtains the green-light source in 534nm to 540nm scope.
Being excited exciton scattering is a kind of new method producing stokes light, this is a kind of non-linear process not only having comprised second order but also comprised Third-order nonlinearity, be excited in exciton scattering process, the stokes light of pump light, generation and this three-beam of polarized wave interact in its overlapping region, continue to produce stokes light and polarized wave.Be infrared and in the crystal of the lateral optical phonon A1 mould of Raman active having, under the condition meeting the conservation of momentum and the conservation of energy, being excited exciton scattering may be used for producing tunable stokes light.
Technical scheme of the present invention is as follows:
Based on a Stokes light source for arsenic acid titanyl potassium crystal, comprise pumped laser system and Stokes resonant cavity; Described Stokes resonant cavity comprises arsenic acid titanyl potassium crystal, and described pumped laser system sends pumping laser and irradiates along Stokes resonant cavity, and the exciton scattering process of being excited of described arsenic acid titanyl potassium crystal forms Stokes light source.Described pumped laser system produces pump light.
Preferred according to the present invention, the described Stokes light source based on arsenic acid titanyl potassium crystal also comprises frequency doubling system, and described frequency doubling system comprises filter and frequency-doubling crystal; The pumping laser that described pumped laser system sends is successively through Stokes resonant cavity, frequency-doubling crystal and filter.
Preferred according to the present invention, described Stokes resonant cavity also comprises Effect of Back-Cavity Mirror and the Stokes outgoing mirror of resonant cavity, the pumping laser that described pumped laser system sends enters Stokes resonant cavity, along the Effect of Back-Cavity Mirror of resonant cavity, arsenic acid titanyl potassium crystal and the outgoing successively of Stokes outgoing mirror.
Preferred according to the present invention, described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium.The nonlinear crystal arsenic acid titanyl potassium of the pump light produced by pumped laser system in Stokes resonant cavity, described nonlinear crystal arsenic acid titanyl potassium has Raman and infrared active diaphragm, produces and is excited exciton scattering, produces non-linear parameter process.Incided the angle in nonlinear crystal arsenic acid titanyl potassium by change pump light, realize the tuning operation of stokes light.
Preferred further, the crystal-cut direction of described nonlinear crystal arsenic acid titanyl potassium is θ=90 °, φ=0 °, and described θ is the angle of pump light and nonlinear crystal z-axis, φ is the angle of nonlinear crystal x-axis and nonlinear crystal side, i.e. the angle in nonlinear crystal x-axis and xz face.The length of nonlinear crystal is l, and the width of nonlinear crystal is d, and thickness is h; The size of all nonlinear crystals in the present invention can require to choose according to concrete pump light spot size and incidence angle.
Preferred further, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium, namely yz face, is all coated with anti-reflection film; The Effect of Back-Cavity Mirror of described resonant cavity is coated with the high-reflecting film of Stokes optical band.Anti-reflection film improves the transmitance of pump light, and the stokes light simultaneously allowing crystal produce transmits as far as possible; Described high-reflecting film vibrates in described Stokes resonant cavity by stokes light, is exported by Stokes outgoing mirror.
Preferred further, described anti-reflection film and high-reflecting film are respectively 1000nm-1100nm anti-reflection film and 1000nm-1100nm high-reflecting film; The reflectivity of described high-reflecting film is greater than 95%.
Preferred according to the present invention, described Stokes outgoing mirror is the transmitance of the light of 1000nm-1100nm for wavelength is 0.01% ~ 99.99%.
Preferred according to the present invention, the angular range between the pump light that described pumped laser system produces and described arsenic acid titanyl potassium crystal x-axis is 1.875 °-6.500 °, to obtain the tunable Stokes light source in 1077.88nm to 1089.02nm scope.
Preferred according to the present invention, the laser system of the 1-100Hz of the low repetition of the pulse laser system of described pumped laser system to be quasi-continuous repetition rate be 100Hz-100kHz, flash lamp pumping or LD pumping; The power density that described pumped laser system provides in arsenic acid titanyl potassium crystal is not less than 10MW/cm
2.
The method of work of above-mentioned Stokes light source is as follows:
The pumping laser that pumped laser system sends enters in Stokes resonant cavity, and described nonlinear crystal arsenic acid titanyl potassium produces is excited exciton scattering, produces stokes light; Being 1.875 °-6.500 ° by changing the angle of the incident Stokes resonant cavity of pumping laser, obtaining the tunable Stokes light source in 1077.88nm to 1089.02nm scope.
The method of work that above-mentioned Stokes light source obtains green glow is as follows:
Tunable stokes light in 1077.88nm to 1089.02nm scope incident frequency-doubling crystal successively, to high anti-, saturating to the green glow height filter of Stokes optical band, obtains the green glow in 534nm to 540nm scope.
Beneficial effect of the present invention:
1, the Stokes light source based on arsenic acid titanyl potassium crystal of the present invention, there is the advantage that low-angle is tuning, namely under the condition of fixed pump pumping wavelength and nonlinear crystal, just can be realized the tuning operation of stokes light by the incident angle changing pump light among a small circle, achieve the tuning of wavelength; Based on be excited the Stokes light source of exciton scattering have be convenient to tuning, easy to use, can the advantage such as encapsulation and integration, working and room temperature, line width;
2, the Stokes light source based on arsenic acid titanyl potassium crystal of the present invention, employ nonlinear crystal arsenic acid titanyl potassium, this crystal non-linear gain is higher, physical and chemical performance is stablized, growing technology is more ripe, there is high damage threshold simultaneously, obtained the tunable Stokes light source in 1077.88nm to 1089.02nm scope by the mode of angle tuning; By can obtain the green glow in 534nm to 540nm scope to the frequency multiplication of described Stokes light source; Tuning range is wide.
Accompanying drawing explanation
Fig. 1 is the crystal-cut direction schematic diagram of arsenic acid titanyl potassium crystal of the present invention;
Fig. 2 is the light channel structure schematic diagram of the Stokes light source based on arsenic acid titanyl potassium crystal of the present invention;
Wherein, 1, the Effect of Back-Cavity Mirror of resonant cavity; 2, Stokes resonant cavity; 3, nonlinear crystal arsenic acid titanyl potassium; 4, Stokes outgoing mirror; 5, frequency-doubling crystal; 6, filter.
Embodiment:
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited thereto.
Embodiment 1,
Based on a Stokes light source for arsenic acid titanyl potassium crystal, comprise pumped laser system and Stokes resonant cavity; Described Stokes resonant cavity comprises arsenic acid titanyl potassium crystal, the Effect of Back-Cavity Mirror 1 of resonant cavity and Stokes outgoing mirror 4, the pumping laser that described pumped laser system sends enters Stokes resonant cavity, along the Effect of Back-Cavity Mirror 1 of resonant cavity, arsenic acid titanyl potassium crystal and Stokes outgoing mirror 4 outgoing successively.The exciton scattering process of being excited of described arsenic acid titanyl potassium crystal forms Stokes light source; Described pumped laser system produces pump light.
Embodiment 2,
As described in Example 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium 3.The nonlinear crystal arsenic acid titanyl potassium 3 of the pump light produced by pumped laser system in Stokes resonant cavity, described nonlinear crystal arsenic acid titanyl potassium 3 has Raman and infrared active diaphragm, produces and is excited exciton scattering, produces non-linear parameter process.Incided the angle in nonlinear crystal arsenic acid titanyl potassium 3 by change pump light, realize the tuning operation of stokes light.
Embodiment 3,
As described in Example 2 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, the crystal-cut direction of described nonlinear crystal arsenic acid titanyl potassium 3 is θ=90 °, φ=0 °, described θ is the angle of pump light and nonlinear crystal z-axis, φ is the angle of nonlinear crystal x-axis and nonlinear crystal side, i.e. the angle in nonlinear crystal x-axis and xz face.The length of nonlinear crystal is l, and the width of nonlinear crystal is d, and thickness is h; The size of all nonlinear crystals in the present invention can require to choose according to concrete pump light spot size and incidence angle.
Embodiment 4,
As described in Example 2 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium 3, and namely yz face is all coated with the anti-reflection film of 1000nm-1100nm; The Effect of Back-Cavity Mirror 1 of described resonant cavity is coated with the high-reflecting film of 1000nm-1100nm, and the reflectivity of described high-reflecting film is greater than 95%.Anti-reflection film is the transmitance in order to improve pump light, and the stokes light simultaneously allowing crystal produce transmits as far as possible; Described high-reflecting film vibrates in described Stokes resonant cavity by stokes light, is exported by Stokes outgoing mirror.
Embodiment 5,
As described in Example 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, described Stokes outgoing mirror 4 is the transmitance of the light of 1000nm-1100nm for wavelength is 70%.
Embodiment 6,
As described in Example 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, the scope of the angle between the pump light that described pumped laser system produces and described arsenic acid titanyl potassium crystal x-axis is 1.875 °-6.500 °, can obtain the tunable Stokes light source in 1077.88nm to 1089.02nm scope.
Embodiment 7,
As described in Example 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, the laser system of the 1-100Hz of the low repetition of the pulse laser system of described pumped laser system to be quasi-continuous repetition rate be 100Hz-100kHz, flash lamp pumping or LD pumping; The power density that described pumped laser system provides in arsenic acid titanyl potassium crystal is 20MW/cm
2.
Embodiment 8,
As described in Example 7 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, described pumped laser system is the laser system of the 1-100Hz of the low repetition of LD pumping.
Embodiment 9,
As described in Example 7 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, described pumped laser system is the laser system of the 1-100Hz of the low repetition of flash lamp pumping.
Embodiment 10,
As described in Example 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, its difference is, the described Stokes light source based on arsenic acid titanyl potassium crystal also comprises frequency doubling system, and described frequency doubling system comprises frequency-doubling crystal 5 and filter 6; The pumping laser that described pumped laser system sends is successively through Stokes resonant cavity, frequency-doubling crystal 5 and filter 6.
Embodiment 11,
The method of work of the Stokes light source based on arsenic acid titanyl potassium crystal as described in embodiment 1-9 any one is as follows:
The pumping laser that pumped laser system sends enters in Stokes resonant cavity at a certain angle, and described nonlinear crystal arsenic acid titanyl potassium produces is excited exciton scattering, produces stokes light; Being 1.875 °-6.500 ° by changing the angle of the incident Stokes resonant cavity of pumping laser, obtaining the tunable Stokes light source in 1077.88nm to 1089.02nm scope.
Embodiment 12,
The method of work that the Stokes light source based on arsenic acid titanyl potassium crystal as described in embodiment 11 obtains green glow is as follows:
Tunable stokes light in 1077.88nm to 1089.02nm scope is incident frequency-doubling crystal 5 successively, to high anti-, saturating to the green glow height filter 6 of Stokes optical band, obtains the green glow in 534nm to 540nm scope.
Claims (10)
1., based on a Stokes light source for arsenic acid titanyl potassium crystal, comprise pumped laser system and Stokes resonant cavity; It is characterized in that, described Stokes resonant cavity comprises arsenic acid titanyl potassium crystal, and described pumped laser system sends pumping laser and irradiates along Stokes resonant cavity, and the exciton scattering process of being excited of described arsenic acid titanyl potassium crystal forms Stokes light source.
2. as claimed in claim 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, described Stokes resonant cavity also comprises Effect of Back-Cavity Mirror and the Stokes outgoing mirror of resonant cavity, the pumping laser that described pumped laser system sends enters Stokes resonant cavity, along the Effect of Back-Cavity Mirror of resonant cavity, arsenic acid titanyl potassium crystal and the outgoing successively of Stokes outgoing mirror.
3., as claimed in claim 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, described arsenic acid titanyl potassium crystal is nonlinear crystal arsenic acid titanyl potassium; The crystal-cut direction of described nonlinear crystal arsenic acid titanyl potassium is θ=90 °, φ=0 °, described θ is the angle of pump light and nonlinear crystal z-axis, and φ is the angle of nonlinear crystal x-axis and nonlinear crystal side, i.e. the angle of nonlinear crystal x-axis and xz.
4., as claimed in claim 3 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, the both ends of the surface of described nonlinear crystal arsenic acid titanyl potassium, namely yz face is all coated with anti-reflection film; The Effect of Back-Cavity Mirror of described resonant cavity is coated with the high-reflecting film of pump light wave band; Described anti-reflection film and high-reflecting film are respectively 1000nm-1100nm anti-reflection film and 1000nm-1100nm high-reflecting film; The reflectivity of described high-reflecting film is greater than 95%.
5., as claimed in claim 2 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, described Stokes outgoing mirror is the transmitance of the light of 1000nm-1100nm for wavelength is 0.01% ~ 99.99%.
6. as claimed in claim 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, the angular range between the pump light that described pumped laser system produces and described arsenic acid titanyl potassium crystal x-axis is 1.875 °-6.500 °.
7. as claimed in claim 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, the laser system of the 1-100Hz of the low repetition of the pulse laser system of described pumped laser system to be quasi-continuous repetition rate be 100Hz-100kHz, flash lamp pumping or LD pumping; The power density that described pumped laser system provides in arsenic acid titanyl potassium crystal is not less than 10MW/cm
2.
8., as claimed in claim 1 based on the Stokes light source of arsenic acid titanyl potassium crystal, it is characterized in that, the described Stokes light source based on arsenic acid titanyl potassium crystal also comprises frequency doubling system, and described frequency doubling system comprises frequency-doubling crystal and filter; The pumping laser that described pumped laser system sends is successively through Stokes resonant cavity, frequency-doubling crystal and filter.
9. the method for work of the Stokes light source as described in claim 1-7 any one is as follows:
The pumping laser that pumped laser system sends enters in Stokes resonant cavity at a certain angle, and described nonlinear crystal arsenic acid titanyl potassium produces is excited exciton scattering, produces stokes light; Being 1.875 °-6.500 ° by changing the angle of the incident Stokes resonant cavity of pumping laser, obtaining the tunable Stokes light source in 1077.88nm to 1089.02nm scope.
10. to obtain the method for work of green glow as follows for Stokes light source as claimed in claim 9:
Tunable stokes light in 1077.88nm to 1089.02nm scope incident frequency-doubling crystal successively, to high anti-, saturating to the green glow height filter of Stokes optical band, obtains the green glow in 534nm to 540nm scope.
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