CN100568075C - Mixed injection type FS laser optical parameter amplifier device - Google Patents
Mixed injection type FS laser optical parameter amplifier device Download PDFInfo
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- CN100568075C CN100568075C CNB2005100259587A CN200510025958A CN100568075C CN 100568075 C CN100568075 C CN 100568075C CN B2005100259587 A CNB2005100259587 A CN B2005100259587A CN 200510025958 A CN200510025958 A CN 200510025958A CN 100568075 C CN100568075 C CN 100568075C
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Abstract
The invention belongs to laser technology field, be specially a kind of mixing pouring-in femtosecond pulse optical parameter amplifier (OPA) device, comprise two-stage conllinear OPA, a femtosecond pump laser source, a synchronous narrow-band signal optical source, at least two dichroic mirrors, an optical filter and two delayers.Described two-stage OPA uses the injection light of different wave length respectively, and the first order uses narrow band signal light as injection, and the femtosecond that the second level uses previous stage newly to produce " totally " of amplification leaves unused light pulse as injection.This femtosecond OPA device is efficient, stable, the superior in quality and compact conformation of output laser spectrum; Can be used as desirable tunable femtosecond laser source.
Description
Technical field
The invention belongs to laser technology field, be specifically related to a kind of femtosecond laser optical parameter amplifier (OPA) device.
Background technology
Femtosecond pulse provides a kind of important scientific research means, is applied to the research of ultrafast process and high light and matter interaction.The OPA process is that a kind of important laser energy amplifies and the wavelength tuning means.Femtosecond OPA device has become a kind of efficient, stable tunable femtosecond pulse source.
The OPA process occurs in the suitable nonlinear crystal, has the laser of three kinds of different frequencies (or wavelength) to participate in, and divides another name pump light, flashlight and idle light.In the OPA process, high light intensity, high-frequency pump light amplify strong, the low-frequency flashlight of the low light level, can produce and amplify idle light simultaneously.
In order to promote efficient and stability, femtosecond OPA device adopts multistage structure for amplifying usually, and the synchronous narrow-band light source of use and pump light source is as injection light.The pouring-in multistage femtosecond OPA device in traditional arrowband adopts single mode that wavelength injects of planting usually, also be that flashlight amplifies through two-stage OPA, first order OPA uses narrow band signal light as the injection source, second level OPA uses previous stage OPA newly to produce the femtosecond flashlight of amplification as injection source (T.Wang et al., OpticsCommunications 239 (2004) 397-401).Thing followed problem is, the arrowband injects the femtosecond flashlight that light is mingled in device output, because their wavelength are identical, be difficult to narrow band light is separated, make the narrow-band spectrum composition that contains high-amplitude in the wide spectrum of femto-second laser pulse, thereby reduced the spectral quality of femtosecond signal laser, limited the application of femtosecond OPA device.
Summary of the invention
The objective of the invention is to propose a kind of efficient, stable, the output laser spectrum is superior in quality and the femtosecond laser optical parameter amplifier installation of compact conformation.
The femtosecond laser optical parameter amplifier installation that the present invention proposes is characterized in that comprising two-stage conllinear OPA, a femtosecond pump laser source, a synchronous narrow-band signal optical source, four dichroic mirrors and two delayers; Described two-stage OPA comprises at least one block of nonlinear crystal, its orientation angles is positioned at pump light and injects near the light phase-matching angle degree, can help the femtosecond flashlight to set up lasting gain effectively thereby inject light, and regulate tunable output femtosecond signal light wavelength by the orientation angles of crystal; The femtosecond pump light source is as the pump light of OPA; The synchronous narrow-band signal optical source is the continuous laser source, or has the Long Pulse LASER source of time synchronism apparatus, and its output wavelength is close with the OPA signal light wavelength; Two-stage OPA uses the injection light of different wave length respectively, and the first order uses narrow band signal light as injection, and the femtosecond that the second level uses previous stage newly to produce " totally " of amplification leaves unused light pulse as injection; Dichroic mirror before the OPA at different levels is used for pump light and injects the coupling of light, dichroic mirror after the first order OPA is used to separate pump light makes it to enter different delayers with idle light, absorption-type optical filter after the first order OPA or dichroic mirror make idle transmittance or reflection enter second level OPA and signal light wavelength is absorbed or are transmitted to outside the system, and the optical filter after the OPA of the second level is used to export the femtosecond flashlight; Described two delayers are made of catoptron, and these catoptrons also can be served as by the dichroic mirror in the device, and delayer is used to regulate the pump light and the time delay of injecting light pulse of second level OPA, makes them overlapping in time.
According to the application requirements of device, can do different the adjustment to the structure of this device.Two-stage OPA respectively has a nonlinear crystal, thereby the grain arrangement angle of every grade of OPA can be regulated respectively; Perhaps two-stage OPA uses round trip OPA structure, thereby makes device more compact with same block of nonlinear crystal in crystal; Perhaps using the combination of said two devices, also is that every grade of OPA comprises a nonlinear crystal, can use the round trip structure in every crystal, thereby number of times is amplified in multiplication, to reach bigger efficient.
Can also comprise a beam splitter in the said apparatus, the light separated into two parts with the femtosecond pump laser source is sent respectively as the pump light of two-stage OPA, utilizes beam splitter can select the energy proportion of this two parts pump light, thus the efficient of optimization means.
Light beam on the light path contract bundle device or beam expander be can also comprise in the said apparatus again, beam size and light intensity changed by it.
OPA device according to the present invention has been guaranteed efficient and stable femtosecond signal laser output by the structure of pouring-in multistage amplification on the basis that does not increase the conventional apparatus complicacy; Use two kinds of wavelength laser sources to mix the mode of injecting, avoided narrow band signal to inject light effectively and be mingled in the middle of the device output laser, guaranteed the spectroscopic pure cleanliness of output laser.Output femtosecond flashlight also has good pulsewidth, bandwidth and tuning performance index.
Description of drawings
Figure 1 shows that the pouring-in OPA device of mixing according to the present invention.
Figure 2 shows that the device that uses monolithic crystal round trip OPA structure.
Figure 3 shows that the device that comprises the pump light beam splitter.
Figure 4 shows that the device that comprises four OPA amplification process.
Number in the figure: 1 is pump laser source, and 2 is the synchronous narrow-band lasing light emitter, and 3 is nonlinear crystal, 4 is nonlinear crystal, and 5 is beam splitter, and 6 is delayer, 7 is catoptron, and 8 is dichroic mirror, and 8 ' is dichroic mirror; 8 " be dichroic mirror, 9 is delayer, and 9 ' is catoptron; 9 " be catoptron, 10 is dichroic mirror, and 11 is filter plate, 12 is optical filter, and 13 is dichroic mirror, and 13 ' is dichroic mirror, 13 " be dichroic mirror, 14 is the femtosecond pump light, and 15 is the femtosecond pump light; 16 is narrow band signal light; 17 are the idle light pulse of femtosecond, and 18 is the femtosecond signal laser, and 19 are the idle light of femtosecond; 20 is the femtosecond flashlight, and 21 is catoptron.
Embodiment
Further describe the present invention below in conjunction with accompanying drawing.
Figure 1 shows that the pouring-in OPA device of mixing according to the present invention.This device comprises two-stage OPA, and they comprise nonlinear crystal 3 and 4 respectively.The femtosecond laser 14 (15) of pump laser source 1 outgoing is according to the order of sequence by crystal 3 and 4, as the pump light of two-stage OPA; Synchronous narrow-band lasing light emitter 2 laser of narrowband 16 with OPA flashlight close-spaced wavelength that send is as the injection light of first order OPA.Dichroic mirror 10 makes femtosecond pump light 14 (15) and 16 couplings of continuous signal light, and conllinear enters nonlinear crystal 3, carries out first order OPA process in the mode of I class coupling, thereby produces femtosecond flashlight 20 and the idle light 17 of femtosecond that the first order is amplified.Dichroic mirror 13 makes femtosecond pump light 14 (15) and the idle light 17 of femtosecond separately, and transmission and reflection enter delayer 9 and 6 and adjust time delay respectively; There are continuous signal light 16 and femtosecond flashlight 20 to enter delayer equally by dichroic mirror 13, for they are removed, constitute in the eyeglass of two reflective delayers 9 and 6, having an eyeglass respectively at least is dichroic mirror to the signal light wavelength full impregnated, thereby continuous signal light 16 and femtosecond flashlight 20 can't enter second level OPA by delayer, have guaranteed that as the idle light pulse 17 of femtosecond that second level OPA injects light are " totally ".Dichroic mirror 8 again will be by the femtosecond pump light 14 (15) of time-interleaving behind the delayer and idle light 17 couplings of femtosecond of " totally ", conllinear enters crystal 4, mode with I class coupling is carried out second level OPA process, injection light is served as in the idle light pulse 17 of the femtosecond of " totally " therein, thereby produces femtosecond flashlight 18 and the idle light 19 of femtosecond that amplifies the second level.Last optical filter idle light 19 of 12 reflection femtoseconds and remaining femtosecond pump light 14 (15), and femtosecond flashlight 18 is seen through and output system, make us obtain the femtosecond signal laser 18 that amplify the second level.
Narrow band signal light can adopt suitable intensity to inject, and bigger light intensity is set up in crystal as early as possible with the gain that impels the femtosecond flashlight, and the arrowband injects the bandwidth that light can influence the femtosecond flashlight that is produced too by force; Narrow band signal light is prevented from entering second level OPA, second level OPA adopts the femtosecond of " totally " of first order OPA amplification to leave unused light pulse as the injection source, so do not mix the composition of narrow band signal light in the middle of the femtosecond flashlight that OPA output in the second level is amplified, this has just been avoided traditional pouring-in femtosecond OPA device of narrow band signal light to export the not problem of " totally " of femtosecond signal spectrum; Theoretical Calculation and experimental results show that simultaneously, second level OPA adopts the idle light of femtosecond to replace the used femtosecond flashlight of traditional approach as injecting light, no matter the femtosecond flashlight of its result's output is efficient, stability, or waveform, spectrum and wavelength tuning, its quality is all significantly distinguished with the nothing of traditional approach, and apparatus of the present invention have kept the compactedness of traditional approach device fully.
Figure 2 shows that the device that uses monolithic crystal round trip OPA structure.Compare with device shown in Figure 1, this device adopts the mode of using round trip OPA structure in monolithic crystal 3 to replace carrying out respectively in two crystal 3s and 4 mode of an OPA; Twice of light beam with opposite direction through same crystal 3 (4), thereby carry out twice OPA therein, cooperate with compact more delayer and dichroic mirror 9,6,8 (13).Because the restriction of geometry, round trip light path in the crystal is also not parallel, but a tiny angle is arranged in paper, for the OPA that makes the round trip light path satisfies the position condition that is complementary simultaneously, the optical axis of crystal is limited in vertical with paper and near in the plane of round trip light path.
Figure 3 shows that the device that comprises the pump light beam splitter, is the improved form of device shown in Figure 1.It comprises the beam splitter 5 of a pump light, pump light separated into two parts 14 and 15, respectively as the pump light of two-stage OPA.Narrow band signal light 16 is coupled into first order OPA crystal 3 by dichroic mirror 10 and pump light 15, optical filter 11 after the crystal 3, be used to absorb the femtosecond flashlight 20 of narrow band signal light 16 and first order amplification, and see through the idle light 17 of femtosecond that the first order is amplified, make it to enter delayer 9.Pump light 14 enters delayer 6 from beam splitter 5.Delayer 6 and 9 is made of the reflecting optics for idle light and pump light wavelength respectively.Dichroic mirror 8 again will be by the femtosecond pump light 14 (15) of time-interleaving behind the delayer and idle light 17 couplings of femtosecond of " totally ", and conllinear enters second level OPA crystal 4.Idle light 19 of femtosecond and the remaining femtosecond pump light 14 (15) that amplify the last optical filter 12 reflection second level, and the femtosecond flashlight 18 that amplify the second level that us are needed sees through and output system.This device can be adjusted the pump light 14 of two-stage OPA and 15 energy proportion by selecting suitable beam splitter 5, makes the output of device energy-optimised.
Figure 4 shows that the device that comprises four OPA amplification process.It has increased the round trip structure that device shown in Figure 2 adopted according to device shown in Figure 3, has also promptly used the round trip structure respectively in two OPA crystal 3s and 4.Take this structure, make and carried out the OPA process altogether four times in this device, utilized the energy of crystal length and pump light more fully, to obtain more excellent femtosecond flashlight transformation efficiency.The nonlinear crystal 3 and 4 that uses in the actual device is LN (lithium niobate) crystal that length is respectively 6mm and 8mm, the crystal that can be used for OPA equally has β-BBO (barium borate), LBO (three lithium borates) etc., but the also nonlinear material of periodic polarization such as PPLN (periodically lithium niobate) etc.Pump laser source 1 is a titanium jewel regenerative amplification laser instrument, the femtosecond laser wavelength of outgoing is 800nm, and single pulse energy is 200 μ J, is that 40% beam splitting chip 5 is divided into two parts 14 and 15 by reflectivity, and respectively through the telescopic system bundle that contracts, with as the pump light in crystal 3 and 4.The arrowband injects light 16 continuously by 2 outputs of Nd:YAG continuous wave laser, wavelength 1064nm, and output power is adjustable, is 500mW to the maximum." totally " degree in order to ensure the idle light pulse 17 of the femtosecond that is injected into second level OPA crystal 4, optical filter 11 uses the plated film germanium wafer, (near the 3 μ m) are anti-reflection for idle optical wavelength range, and near signal light wavelength scope (the 1 μ m) strong absorption, thereby with the 20 effective filterings of first order amplifying signal light.Optical filter 12 is used for seeing through and exporting the femtosecond flashlight 18 that amplify the second level.In the round trip structure of two crystal 13 ', 13 " be dichroic mirror, catoptron 9 ', 9 ", 6 ', 6 " and the formation delayer.Catoptron 7 and 21 is used for changing the light path beam direction.Crystal 3 and 4 is installed on the adjustable mirror holder, can come tuning output femtosecond signal light wavelength by regulating the orientation angles of crystal 3 and 4.The single pulse energy of the femtosecond flashlight that device output obtains is 20 μ J, reaches 10% with respect to the energy conversion efficiency of pump light, and femtosecond flashlight pulsewidth is 100fs, and spectral width is 23nm, and the approximate range of tunable wave length is from 1010nm to 1080nm; The above-mentioned pulse parameter that this device output obtains flashlight all with the conventional apparatus of using single wavelength injection source export suitable, but this device is than conventional apparatus, effectively remove the arrowband that mixes in the femtosecond signal laser of output and injected light component, its arrowband that mixes injects light component and accounts for the ratio of device injection continuous light power less than 10-8, significantly improved the spectral quality of femtosecond signal laser, made device have better application performance and wider range of application.
Claims (1)
1, a kind of mixed injection type FS laser optical parameter amplifier device is characterized in that comprising two-stage conllinear OPA, a femtosecond pump laser source, a synchronous narrow-band signal optical source, three dichroic mirrors, an optical filter and two delayers; Described two-stage OPA comprises a nonlinear crystal respectively, the orientation angles of nonlinear crystal is positioned at pump light and injects near the light phase-matching angle degree, can help the femtosecond flashlight to set up lasting gain effectively thereby in nonlinear crystal, inject light, and regulate tunable OPA output femtosecond signal light wavelength by the orientation angles of crystal; The femtosecond pump light source is as the pump light of OPA; The synchronous narrow-band signal optical source is the continuous laser source, or has the Long Pulse LASER source of time synchronism apparatus, and its output wavelength is close with the OPA signal light wavelength; Femtosecond pump light and serve as the coupling of the synchronous narrow-band flashlight that injects light through first dichroic mirror, conllinear is injected first block of nonlinear crystal, realization first order conllinear OPA; Enter second dichroic mirror (13) after the first order OPA process, second dichroic mirror (13) makes femtosecond pump light and the idle light of femtosecond separately, and transmission and reflection enter delayer (9) and another delayer (6) respectively, regulate time delay; After postponing adjusting, femtosecond pump light and serve as the femtosecond that the injects light light that leaves unused and be coupled through the 3rd dichroic mirror, conllinear is injected second block of nonlinear crystal, realize second level conllinear OPA, place optical filter after the OPA of the second level, be used to remove femtosecond pump light and the idle light of femtosecond, make second level OPA newly produce the femtosecond flashlight output system of amplification through second level OPA; Here OPA is meant the laser optics parameter amplifier.
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| KR100749342B1 (en) * | 2006-05-26 | 2007-08-14 | 한국과학기술원 | Apparatus for optical parametric chirped pulse amplification(opcpa) using idler and inverse chirping |
| CN101216654B (en) * | 2008-01-10 | 2010-09-29 | 复旦大学 | Method for enhancing optical parametric amplifier output magnified signal light impulse and beam quality |
| CN100570464C (en) * | 2008-07-23 | 2009-12-16 | 中国科学院上海光学精密机械研究所 | The dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase |
| CN102520560A (en) * | 2011-12-30 | 2012-06-27 | 太原理工大学 | Upgrade method for automatic tuning of output wavelength of femtosecond optical parametric amplifier |
| CN103605249B (en) * | 2013-11-29 | 2016-04-20 | 华中科技大学 | A kind of double pumping action chirp compensation optically erasing method and device |
| CN108565670B (en) * | 2018-04-08 | 2020-10-09 | 上海理工大学 | Method for realizing spectrum high-resolution coherent anti-Stokes Raman scattering light source |
| CN117526072B (en) * | 2023-11-10 | 2024-04-02 | 天津大学 | Dual-color pumping high-power femtosecond optical parametric amplifier device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4815080A (en) * | 1986-05-14 | 1989-03-21 | Centre National De La Recherche Scientifique | Laser providing stable femtosecond pulses |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4815080A (en) * | 1986-05-14 | 1989-03-21 | Centre National De La Recherche Scientifique | Laser providing stable femtosecond pulses |
Non-Patent Citations (2)
| Title |
|---|
| 连续波注入的1μm波段飞秒光学参量放大器. 朱鹤元，徐光，王韬，钱列加，范滇元.中国科学 G辑 物理学 力学 天文学，第34卷第5期. 2004 |
| 连续波注入的1μm波段飞秒光学参量放大器. 朱鹤元，徐光，王韬，钱列加，范滇元.中国科学 G辑 物理学 力学 天文学，第34卷第5期. 2004 * |
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