CN101895053A - Cascade optical parameter transformation system and optical parameter transformation method - Google Patents
Cascade optical parameter transformation system and optical parameter transformation method Download PDFInfo
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- CN101895053A CN101895053A CN2009100853770A CN200910085377A CN101895053A CN 101895053 A CN101895053 A CN 101895053A CN 2009100853770 A CN2009100853770 A CN 2009100853770A CN 200910085377 A CN200910085377 A CN 200910085377A CN 101895053 A CN101895053 A CN 101895053A
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Abstract
The invention relates to a cascade optical parameter transformation system and an optical parameter transformation method. The system comprises a kalium titanyl phosphate (KTP) crystal and a kalium titanyl arsenate (KTA) crystal which are in cascade connection with each other, wherein the KTP crystal is used for performing a type II phase matching parameter transformation process on pump light produced by a pumping source; and the KTA crystal is used for performing a noncritical phase matching parameter transformation process or a 90-degree critical phase matching parameter transformation process on the output of the KTP crystal. In the method, the type II phase matching parameter transformation process is performed on the pump light produced by the pumping source by using the KTP crystal and the noncritical phase matching parameter transformation process or the 90-degree critical phase matching parameter transformation process is performed on the output of the KTP crystal by using the KTA crystal. Parameter light with a wider range can be obtained by making effective use of the transmissivity and effective nonlinear coefficients of the two crystals. The system has the advantages of compact structure and high efficiency.
Description
Technical field
The present invention relates to laser technology field, be specifically related to a kind of cascade optical parameter conversion system and optical parameter method for transformation.
Background technology
The optical parametric oscillation technology is the conventional means of carrying out frequency change in the laser technology field.Optical parameter conversion process commonly used comprises: the optical parameter generating process that utilizes optical parameter generator (OPG) to carry out, the optical parametric oscillation process that the optical parametric oscillator of utilization (OPO) carries out, the optical parameter amplification process that utilizes photoparametric amplifier (OPA) to carry out.Crystal can constitute optical parameter generator (OPG), optical parametric oscillator (OPO) and photoparametric amplifier (OPA) and combination in any thereof simultaneously by difference setting, as vibration chamber formation optical parametric oscillator (OPO) being set, in crystal, import parameteric light and pump light simultaneously and make crystal constitute optical parametric oscillator (OPO) by crystal is connected with the chamber mirror.
If above-mentioned optical parameter conversion process is injected a pump light, to produce a flashlight and an ideler frequency light, flashlight and ideler frequency light must be in the transparency range of nonlinear crystal, and satisfy phase-matching condition, promptly the frequency sum of parameteric light (flashlight+ideler frequency light) the wave vector sum that equals pumping light frequency, parameteric light (flashlight+ideler frequency light) equals the wave vector of pump light.
3～5 mum wavelengths are within the logical optical range of atmosphere, so the LASER Light Source of this wavelength has important use in fields such as laser acquisition, laser communication and laser countermeasure (s)s.The laser of this wave band output at present mainly is to obtain by 1 mum wavelength laser is carried out the optical parameter conversion process.The realization approach has a variety of, for example can reversing by the periodicity farmland, (periodically poled congruent Lithium niobate, PPKTP (periodically poled Potassium titanyl phosphate), PPKTA accurate phase matched such as (periodically poled Potassium titanyl arsenate) obtain lithium columbate crystal PPLN, limiting factor of matching way is that crystal is difficult to make the large scale application in this, has limited the gain of cost of manufacture and crystal; Also can obtain by the OPO of LNization thing crystal or Sization thing crystal, the shortcoming of this implementation is that the lens lesion threshold value is too low, is unsuitable for obtaining the laser output of macro-energy density.Also can obtain in addition by two-stage optical parameter process, representational as two-stage KTA crystal (Potassium titanyl arsenate) (or two-stage ktp crystal (Potassium titanyl phosphate) or two-stage RTA crystal (Rubidium titanyl arsenate)) by with optical parametric oscillator OPO form series connection (is the U.S. Patent application of US6834063 referring to the patent No.), because KTA crystal and RTA crystal price is expensive, growth difficulty, the logical optical wavelength range of ktp crystal is little, has limited the scheme in the patent; Crystal such as KTP are connected with ZGP crystal (Zinc germanium phosphide), the parameteric light of ktp crystal output carries out method that parameter transforms as the pump light of ZGP crystal and also mentions in the patent No. is the U.S. Patent application of US6785041, the shortcoming of these modes is crystal growth difficulties such as ZGP, cost an arm and a leg, the lens lesion thresholding is low, is unfavorable for obtaining the parameteric light of 3～5 μ m of high-energy-density high light beam quality.
The pumping light wavelength that pumping source commonly used produces is 1 μ m, wavelength is that the parameter light wavelength that 1 μ m pump light input ktp crystal obtains near non-critical phase matching is generally less than 3.5 μ m, wavelength is that the parameter light wavelength that 1 μ m pump light input KTA crystal obtains near non-critical phase matching is generally less than 3.7 μ m, in order to obtain parameteric light greater than 3.7 μ m, need carry out tuning, therefore cumbersome to the refractive index and the pump light of KTA crystal.
Summary of the invention
The purpose of this invention is to provide a kind of cascade optical parameter conversion system, can effectively utilize the transmitance and the effective nonlinear coefficient of two crystal, obtain the more parameteric light of wide region, it has compact conformation, the advantage that efficient is high.
For achieving the above object, the present invention adopts following technical scheme:
A kind of cascade optical parameter conversion system comprises the ktp crystal and the KTA crystal of pumping source, cascade, wherein,
Described ktp crystal is used for the pump light that pumping source produces is carried out two class phase matched parameter conversion processes, and exports first parameteric light;
Described KTA crystal is used for the output of described ktp crystal is carried out the critical phase matched parameter conversion process of noncritical phase matching or 90 °, and the output and second parameteric light.
Preferably, described ktp crystal constitutes the optical parameter generator, and the two class phase matched parameter conversion processes that ktp crystal carried out are the parameter generating process;
Or described ktp crystal formation optical parametric oscillator, the two class phase matched parameter conversion processes that ktp crystal carried out are the parametric oscillation process;
Or described ktp crystal formation photoparametric amplifier, the two class phase matched parameter conversion processes that ktp crystal carried out are the parameter amplification process;
Or described ktp crystal formation difference frequency device, the two class phase matched parameter conversion processes that ktp crystal carried out are parameter difference frequency process;
Or the combination in any of described ktp crystal formation optical parameter generator, optical parametric oscillator, photoparametric amplifier and difference frequency device, the two class phase matched parameter conversion processes that ktp crystal carried out are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, parameter difference frequency process.
Preferably, described KTA crystal constitutes the optical parameter generator, and noncritical phase matching that described KTA crystal is carried out or 90 ° critical phase matched parameter conversion process are the parameter generating process;
Or described KTA crystal constitutes optical parametric oscillator, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parametric oscillation process;
Or described KTA crystal constitutes photoparametric amplifier, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parameter amplification process;
Or described KTA crystal formation difference frequency device, the second level parameter conversion process that the KTA crystal is carried out is a parameter difference frequency process;
Or described KTA crystal constitutes the combination in any of optical parameter generator, optical parametric oscillator, photoparametric amplifier and difference frequency device, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, parameter difference frequency process.
Preferably, the pumping light wavelength that described pumping source produces is 1 μ m, and the first parameter light wavelength of described ktp crystal output is 1.3 μ m～1.9 μ m.
Preferably, described pumping source is for producing the pumping source of continuous laser or pulse laser form pump light.
Preferably, described ktp crystal along the XZ plane or the YZ plane be cut;
Described KTA crystal is cut along X-axis or Y-axis.
The present invention also provides a kind of optical parameter method for transformation, may further comprise the steps:
Utilize ktp crystal that the pump light that pumping source produces is carried out two class phase matched parameter conversion processes, and export first parameteric light;
Utilize the KTA crystal that the critical phase matched parameter conversion process of noncritical phase matching or 90 ° and the output and second parameteric light are carried out in the output of ktp crystal.
Preferably, described two class phase matched parameter conversion processes are parameter generating process, parametric oscillation process, parameter amplification process or difference frequency process, or are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, difference frequency process.
Preferably, the critical phase matched parameter conversion process of described noncritical phase matching or 90 ° is parameter generating process, parametric oscillation process, parameter amplification process or difference frequency process, or is the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, difference frequency process.
Utilize cascade optical parameter conversion system provided by the invention and optical parameter method for transformation, have following beneficial effect:
For a short time the problem that has caused the output parameter optical wavelength not meet the demands owing to the logical optical wavelength range of ktp crystal when 1) having avoided the series connection of two-stage KTA crystal;
2) avoid series connection of two-stage ktp crystal or two-stage RTA crystal or ktp crystal pumping ZGP crystal owing to KTA, RTA, expensive, the growth difficulty of ZGP crystal price, caused the high problem of manufacturing cost;
3) utilize the transmitance and the effective nonlinear coefficient of ktp crystal and KTA crystal, adopt different parameter conversion processes to obtain the more parameteric light of wide region, system has compact conformation, efficient height, the advantage that cost is low.
Description of drawings
Fig. 1 is a cascade optical parameter conversion system combination assumption diagram of the present invention;
Fig. 2 is a kind of cascade optical parameter conversion system combination assumption diagram in the embodiment of the invention;
Fig. 3 is an another kind of cascade optical parameter conversion system combination assumption diagram in the embodiment of the invention.
Embodiment
Cascade optical parameter conversion system and optical parameter method for transformation that the present invention proposes are described as follows in conjunction with the accompanying drawings and embodiments.
Ktp crystal and KTA crystal all belong to biaxial crystal, in same refractive index primary flat, non-critical phase matching has bigger effective nonlinear coefficient, big allowable temperature width and angle off resonance amount and does not have walk-off effect, generally adopts as far as possible near 90 ° of phase matched and carries out the parameter transfer process.
As shown in Figure 1, cascade optical parameter conversion system of the present invention comprises the ktp crystal and the KTA crystal of pumping source (not shown), cascade, and ktp crystal is used for the pump light that pumping source produces is carried out two class phase matched parameter conversion processes, and exports first parameteric light; The KTA crystal is used for output to ktp crystal and is specially the critical phase matched parameter conversion process that short wavelength's parameteric light of being exported carries out noncritical phase matching or 90 °, and the output and second parameteric light.Two class phase matched parameter conversion processes are meant that the parameteric light (flashlight Signal+ ideler frequency light Idler) exported satisfies the parameter conversion process of two class phase-matching conditions, and the critical phase matched parameter conversion process of noncritical phase matching or 90 ° is meant that the parameteric light of being exported (flashlight Signal+ ideler frequency light Idler) satisfies the parameter conversion process of the critical phase-matching condition of noncritical phase matching or 90 °.
As previously mentioned, ktp crystal can be used as optical parameter generator (OPG) and uses, also can use by connecting and composing optical parametric oscillator (OPO) with the chamber mirror, input pumping light and parameteric light use as photoparametric amplifier (OPA) simultaneously simultaneously, can also constitute the difference frequency device in addition, optical parameter generator (OPG), optical parametric oscillator (OPO), photoparametric amplifier (OPA) and difference frequency device can be realized two class phase matched parameter conversion processes, and the critical phase matched parameter conversion process of noncritical phase matching or 90 °.Therefore, preferably, ktp crystal constitutes optical parameter generator (OPG), and the two class phase matched parameter conversion processes that ktp crystal carried out are the parameter generating process; Or ktp crystal formation optical parametric oscillator (OPO), the two class phase matched parameter conversion processes that ktp crystal carried out are the parametric oscillation process; Or ktp crystal formation photoparametric amplifier (OPA), the two class phase matched parameter conversion processes that ktp crystal carried out are the parameter amplification process; Or ktp crystal formation difference frequency device, the two class phase matched parameter conversion processes that ktp crystal carried out are parameter difference frequency process.Simultaneously, can also utilize ktp crystal to constitute the combination in any of optical parameter generator, optical parametric oscillator, photoparametric amplifier and difference frequency device, the two class phase matched parameter conversion processes that ktp crystal carried out are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, parameter difference frequency process.
Equally, the KTA crystal can constitute optical parameter generator (OPG), and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parameter generating process; Or the KTA crystal constitutes optical parametric oscillator (OPO), and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parametric oscillation process; Or the KTA crystal constitutes photoparametric amplifier (OPA), and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parameter amplification process; Or KTA crystal formation difference frequency device, the second level parameter conversion process that second level parameter conversion unit is carried out is a parameter difference frequency process; Or the combination in any of KTA crystal formation optical parameter generator, optical parametric oscillator, photoparametric amplifier and difference frequency device, noncritical phase matching that second level parameter conversion unit is carried out or 90 ° critical phase matched parameter conversion process are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, parameter difference frequency process.
As shown in Figure 2, the ktp crystal in the cascade optical parameter conversion system constitutes optical parametric oscillator (OPO), and the two class phase matched parameter conversion processes that ktp crystal carried out are the parametric oscillation process; The KTA crystal constitutes optical parametric oscillator (OPO), and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parametric oscillation process, final output parameter light.
As shown in Figure 3, ktp crystal constitutes the combination of optical parametric oscillator (OPO) and photoparametric amplifier (OPA), and the two class phase matched parameter conversion processes of being carried out are the combination of parametric oscillation process and parameter amplification process; Or the combination of formation optical parameter generator (OPG) and photoparametric amplifier (OPA), the two class phase matched parameter conversion processes of being carried out are the combination of parameter generating process and parameter amplification process; Or the combination of formation difference frequency device and photoparametric amplifier (OPA), the two class phase matched parameter conversion processes of being carried out are the combination of difference frequency process and parameter amplification process.The KTA crystal constitutes the combination of optical parametric oscillator (OPO) and photoparametric amplifier (OPA), and the critical phase matched parameter conversion process of the noncritical phase matching of being carried out or 90 ° is the combination of parametric oscillation process and parameter amplification process; Or constituting the combination of optical parameter generator (OPG) and photoparametric amplifier (OPA), the critical phase matched parameter conversion process of the noncritical phase matching of being carried out or 90 ° is the combination of parameter generating process and parameter amplification process; Or constituting the combination of difference frequency device and photoparametric amplifier (OPA), the critical phase matched parameter conversion process of the noncritical phase matching of being carried out or 90 ° is the combination of difference frequency process and parameter amplification process, finally output parameter light.
The pumping light wavelength that pumping source produces in the present embodiment is 1 μ m.By adopting ktp crystal to carry out two class phase matched parameter conversion processes, the first parameter light wavelength of output is 1.3 μ m～1.9 μ m.This wavelength is that first parameteric light of 1.3 μ m～1.9 μ m is done pump light and is input to the KTA crystal, carries out the critical phase matched parameter conversion process of noncritical phase matching or 90 °, can obtain the parameteric light of wavelength greater than 3.7 μ m.Pumping source is for producing the pumping source of continuous laser or pulse laser form pump light.Ktp crystal can be cut along the XZ plane, also can be along YZ plane cutting (the refractive index main shaft of crystal has X-axis, Y-axis, Z axle, and X, Z two reference axis are formed the XZ plane, and Y, Z two reference axis are formed the YZ plane); Ktp crystal can adopt critical phase matched, also can adopt noncritical phase matching; The KTA crystal can cut along X-axis, also can cut (X-axis, the corresponding crystal X of Y-axis, Y refractive index main shaft) along Y-axis.
Optical parameter method for transformation of the present invention may further comprise the steps: utilize ktp crystal that the pump light that pumping source produces is carried out two class phase matched parameter conversion processes, and export first parameteric light; Utilize the KTA crystal that the critical phase matched parameter conversion process of noncritical phase matching or 90 ° and the output and second parameteric light are carried out in the output of ktp crystal.Described two class phase matched parameter conversion processes are parameter generating process, parametric oscillation process, parameter amplification process or difference frequency process, or are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, difference frequency process.The critical phase matched parameter conversion process of described noncritical phase matching or 90 ° is parameter generating process, parametric oscillation process, parameter amplification process or difference frequency process, or is the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, difference frequency process.
Above execution mode only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (9)
1. a cascade optical parameter conversion system is characterized in that, comprises the ktp crystal and the KTA crystal of pumping source, cascade, wherein,
Described ktp crystal is used for the pump light that pumping source produces is carried out two class phase matched parameter conversion processes, and exports first parameteric light;
Described KTA crystal is used for the output of described ktp crystal is carried out the critical phase matched parameter conversion process of noncritical phase matching or 90 °, and the output and second parameteric light.
2. system according to claim 1 is characterized in that,
Described ktp crystal constitutes the optical parameter generator, and the two class phase matched parameter conversion processes that ktp crystal carried out are the parameter generating process;
Or described ktp crystal formation optical parametric oscillator, the two class phase matched parameter conversion processes that ktp crystal carried out are the parametric oscillation process;
Or described ktp crystal formation photoparametric amplifier, the two class phase matched parameter conversion processes that ktp crystal carried out are the parameter amplification process;
Or described ktp crystal formation difference frequency device, the two class phase matched parameter conversion processes that ktp crystal carried out are parameter difference frequency process;
Or the combination in any of described ktp crystal formation optical parameter generator, optical parametric oscillator, photoparametric amplifier and difference frequency device, the two class phase matched parameter conversion processes that ktp crystal carried out are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, parameter difference frequency process.
3. system according to claim 1 is characterized in that,
Described KTA crystal constitutes the optical parameter generator, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parameter generating process;
Or described KTA crystal constitutes optical parametric oscillator, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parametric oscillation process;
Or described KTA crystal constitutes photoparametric amplifier, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the parameter amplification process;
Or described KTA crystal formation difference frequency device, the second level parameter conversion process that the KTA crystal is carried out is a parameter difference frequency process;
Or described KTA crystal constitutes the combination in any of optical parameter generator, optical parametric oscillator, photoparametric amplifier and difference frequency device, and the critical phase matched parameter conversion process of the noncritical phase matching that the KTA crystal is carried out or 90 ° is the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, parameter difference frequency process.
4. system according to claim 1 is characterized in that,
The pumping light wavelength that described pumping source produces is 1 μ m, and the first parameter light wavelength of described ktp crystal output is 1.3 μ m～1.9 μ m.
5. system according to claim 1 is characterized in that, described pumping source is for producing the pumping source of continuous laser or pulse laser form pump light.
6. system according to claim 1 is characterized in that,
Described ktp crystal along the XZ plane or the YZ plane be cut;
Described KTA crystal is cut along X-axis or Y-axis.
7. an optical parameter method for transformation is characterized in that, may further comprise the steps:
Utilize ktp crystal that the pump light that pumping source produces is carried out two class phase matched parameter conversion processes, and export first parameteric light;
Utilize the KTA crystal that the critical phase matched parameter conversion process of noncritical phase matching or 90 ° and the output and second parameteric light are carried out in the output of ktp crystal.
8. method according to claim 7 is characterized in that,
Described two class phase matched parameter conversion processes are parameter generating process, parametric oscillation process, parameter amplification process or difference frequency process, or are the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, difference frequency process.
9. method according to claim 7 is characterized in that,
The critical phase matched parameter conversion process of described noncritical phase matching or 90 ° is parameter generating process, parametric oscillation process, parameter amplification process or difference frequency process, or is the combination in any of parameter generating process, parametric oscillation process, parameter amplification process, difference frequency process.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868354A (en) * | 2015-04-22 | 2015-08-26 | 中国科学院理化技术研究所 | Optical parameter laser apparatus |
| CN110187588A (en) * | 2019-04-29 | 2019-08-30 | 华中科技大学 | A kind of broadband optical parameter amplification method and device based on cascaded transistor |
| CN110895377A (en) * | 2018-09-13 | 2020-03-20 | 武汉工程大学 | Optical parametric amplification method and device |
| CN112864789A (en) * | 2021-01-11 | 2021-05-28 | 中国科学院理化技术研究所 | Picosecond pulse optical parameter frequency conversion laser output device |
| EP3968086A1 (en) | 2020-09-15 | 2022-03-16 | Shan Dong University | A parametric light generation method and its application |
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2009
- 2009-05-22 CN CN2009100853770A patent/CN101895053A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868354A (en) * | 2015-04-22 | 2015-08-26 | 中国科学院理化技术研究所 | Optical parameter laser apparatus |
| CN110895377A (en) * | 2018-09-13 | 2020-03-20 | 武汉工程大学 | Optical parametric amplification method and device |
| CN110187588A (en) * | 2019-04-29 | 2019-08-30 | 华中科技大学 | A kind of broadband optical parameter amplification method and device based on cascaded transistor |
| CN110187588B (en) * | 2019-04-29 | 2020-11-17 | 华中科技大学 | Broadband optical parametric amplification method and device based on cascade crystal |
| EP3968086A1 (en) | 2020-09-15 | 2022-03-16 | Shan Dong University | A parametric light generation method and its application |
| CN112864789A (en) * | 2021-01-11 | 2021-05-28 | 中国科学院理化技术研究所 | Picosecond pulse optical parameter frequency conversion laser output device |
| CN112864789B (en) * | 2021-01-11 | 2022-05-03 | 中国科学院理化技术研究所 | Picosecond pulse optical parameter frequency conversion laser output device |
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Application publication date: 20101124 |