CN102162966B - Spectrum spreading device for femtosecond laser frequency comb - Google Patents

Spectrum spreading device for femtosecond laser frequency comb Download PDF

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CN102162966B
CN102162966B CN 201110085865 CN201110085865A CN102162966B CN 102162966 B CN102162966 B CN 102162966B CN 201110085865 CN201110085865 CN 201110085865 CN 201110085865 A CN201110085865 A CN 201110085865A CN 102162966 B CN102162966 B CN 102162966B
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femtosecond laser
mirror
frequency comb
laser frequency
dispersion
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CN102162966A (en
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张大鹏
梁志国
武腾飞
韩海年
魏志义
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中国航空工业集团公司北京长城计量测试技术研究所
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Abstract

The invention relates to a spectrum spreading device for a femtosecond laser frequency comb, which belongs to the technical field of photophysics. The spectrum spreading device comprises a first planar mirror, a second planar mirror, a third planar mirror, a fourth planar mirror, a fifth planar mirror, a dispersion compensation prism pair, a first dispersion compensation chirp mirror pair, a second dispersion compensation chirp mirror pair and a photonic crystal fiber. By a method for outer cavity dispersion compensation and compression pulse, a femtosecond laser pulse generated by the femtosecond laser frequency comb of a difference frequency cavity is recompressed to have the width of dozens of femtosecond magnitudes and is injected into the photonic crystal fiber, and the spectrum is widened to the range of between 600mn and 1,000nm by using the effects such as high nonlinearity of the photonic crystal fiber and the like. The spectrum spreading device has a simple structure and lowcost and is easy to realize, a widened optical frequency comb can be used for directly measuring frequency-stabilized laser frequency of 633nm, and a characteristic of long-time stable operation can still be kept.

Description

一种用于飞秒激光频率梳的扩谱装置 A method for femtosecond laser frequency comb spreading means

技术领域 FIELD

[0001] 本发明专利涉及ー种用于飞秒激光频率梳的扩谱装置,特别涉及一种用于基于差频腔原理的飞秒激光频率梳的扩谱装置,属于光物理技术领域。 [0001] The present invention patent relates to a spreading apparatus ー species femtosecond laser frequency comb, comb and more particularly to an apparatus for spreading a femtosecond laser frequency based on the principle of difference frequency cavity for photophysical technical field belongs.

背景技术 Background technique

[0002] 以掺钛蓝宝石为激光物质的飞秒激光频率梳,可以实现激光频率测量,但由于其梳频锁定到原子钟频率的过程中使用了倍频拍频法(又称为f_2f方法),需要用到光子晶体光纤,导致稳定工作时间通常只能达到40分钟左右。 [0002] In a titanium sapphire laser material femtosecond laser frequency comb laser frequency measurement may be achieved, but because of its comb frequency locked to the process used in the atomic clock frequency beat frequency method (also known as f_2f method), need to use photonic crystal fiber, resulting in a stable working time is usually only about 40 minutes. 经改进后的差频腔原理的飞秒激光频率梳偏移频率的锁定无需经过光子晶体光纤构成锁相环,因而与f_2f方法相比具有稳定工作时间长的优点,可以连续稳定工作9小时以上,但由于掺钛蓝宝石的辐射光谱范围为660nm〜1050nm,吸收光谱范围为400nm〜600nm,从该激光物质构造的激光腔内辐射出的光谱通常约为660nm〜950nm,很难包含660nm以下的波长,因此作为我国长度量计量基准的633nm波长激光频率无法用差频腔原理的飞秒激光频率梳进行直接測量。 The principles of the difference frequency cavity after femtosecond laser frequency comb improved offset frequency without locking the phase locked loop configuration through a photonic crystal fiber, which has the advantage of long time stability compared with f_2f method, continuous stable operation can be more than 9 hours , but the titanium-doped sapphire radiation spectral range is 660nm~1050nm, the absorption spectrum of 400nm~600nm, radiated from the laser cavity of the laser spectrum configuration substance usually about 660nm~950nm, is difficult to contain a wavelength of 660nm or less Therefore a length of 633nm wavelength of the laser frequency can not be metered amount of the reference difference-frequency cavity femtosecond laser frequency comb principles of direct measurement.

发明内容 SUMMARY

[0003] 本发明的目的是为了克服现有技术的缺陷,为了实现光频梳能够用来直接測量633nm稳频激光频率,并仍然保持可长时间稳定工作的特性,提出一种基于差频腔原理的飞秒激光频率梳扩谱装置。 [0003] The object of the present invention is to overcome the drawbacks of the prior art, in order to achieve optical frequency comb can be used to directly measure the frequency characteristic of 633nm laser frequency stabilization, and remain a long time stability can be proposed based on the difference frequency cavity the principles of the femtosecond laser frequency comb spreading means.

[0004] 本发明是通过以下技术方案实现的。 [0004] The present invention is achieved by the following technical solutions.

[0005] 本发明的一种用于飞秒激光频率梳的扩谱装置,包括第一平面反射镜、第二平面反射镜、第三平面反射镜、第四平面反射镜、第五平面反射镜、色散补偿棱镜对、第一色散补偿啁啾镜对、第二色散补偿啁啾镜对和光子晶体光纤,其外围设备为基于差频腔原理的飞秒激光频率梳; [0005] An invention for the femtosecond laser frequency comb spreading means, comprising a first planar mirror, a second mirror plane, the third plane mirror, a fourth mirror plane, the fifth plane mirror dispersion compensating prism pair, a first chirped mirrors for dispersion compensation, dispersion compensating chirped mirrors for the second and the photonic crystal fiber, a peripheral device based on the femtosecond laser frequency comb principle difference frequency chamber;

[0006] 由飞秒激光频率梳产生的光谱范围为650nm〜950nm、脉宽为皮秒量级的飞秒激光脉冲,经过第一平面反射镜和第二平面反射镜反射后,注入色散补偿棱镜对进行飞秒激光的2阶色散补偿和脉宽压缩,之后经过第三平面反射镜反射后,注入第一色散补偿啁啾镜对继续进行色散补偿和脉冲压缩,之后再注入第二色散补偿啁啾镜对继续进行3阶色散补偿和脉冲压缩,上述过程后将飞秒激光脉冲的脉宽由皮秒的量级压缩至几十飞秒的量级,再经过第四平面反射镜和第五平面反射镜反射注入光子晶体光纤进行光谱展宽,从光子晶体光纤出射的飞秒激光脉冲的光谱范围达到600nm〜lOOOnm。 [0006] spectral range from the femtosecond laser frequency comb is produced 650nm~950nm, picosecond pulse width of the femtosecond laser pulses, after a first plane mirror and a second plane reflecting mirror, the dispersion compensating prism injection 2 performs a femtosecond laser-order dispersion compensation and pulse compression, after the third plane mirror reflector, Zhou injecting a second dispersion compensation to a first dispersion compensating chirped mirrors continued dispersion compensation and pulse compression, after re-injection 3 to continue the chirp mirror-order dispersion compensation and pulse compression, the pulse width after the above process is compressed by the femtosecond laser pulses on the order of the order of tens of picoseconds to femtoseconds, then through a fourth and a fifth plane mirror injection plane mirror reflector photonic crystal fiber for spectral broadening, the exit from the PCF spectral range of femtosecond laser pulses reach 600nm~lOOOnm.

[0007] 有益效果 [0007] beneficial effects

[0008] 本发明结构简单、成本低、易实现,使用腔外色散补偿棱镜对和啁啾镜对相结合方式,进行腔外色散补偿和压缩脉冲,将差频腔飞秒激光频率梳产生的由于在空气中传播导致脉宽増大到皮秒量级的光梳,重新压缩到几十飞秒量级的宽度后,注入光子晶体光纤,利用光子晶体光纤的强非线性等效应展宽光谱范围至600nm〜lOOOnm,展宽后的光频梳可以用来直接測量633nm稳频激光频率,并仍然保持可长时间稳定工作的特性。 [0008] The present invention is of simple structure, low cost, easy to implement, outer cavity dispersion compensation using chirped mirror and a prism pair of combined manner, a compression chamber and an outer dispersion compensation pulse, the frequency difference between the chamber femtosecond laser frequency comb generated Since the propagation in air to cause a large pulse width enlargement of picosecond optical comb, and to recompress the width of the order of several tens of femtoseconds, injection photonic crystal fiber, and the like using a strong nonlinear PCF broadened spectral range to effect 600nm~lOOOnm, the optical frequency comb can be used for widening directly measure the frequency characteristic of 633nm laser frequency stabilization, a long time and still maintain a stable operation. 附图说明 BRIEF DESCRIPTION

[0009] 图I为本发明的装置的结构示意图; [0009] Figure I a schematic structural diagram of apparatus of the present invention;

[0010] 其中,I为基于差频腔原理的飞秒激光频率梳,2、3、6、11和12分别为第一平面反射镜、第二平面反射镜、第三平面反射镜、第四平面反射镜和第五平面反射镜,4和5构成色散补偿棱镜对,7和8构成第一色散补偿啁啾镜对,9和10构成第二色散补偿啁啾镜对,13为光子晶体光纤。 [0010] wherein, I is based on the femtosecond laser frequency comb principle difference frequency cavity, 2,3,6,11 and 12 are a first planar mirror, a second mirror plane, the third plane mirror, a fourth fifth plane and plane mirror reflector, 4 and 5 constituting the dispersion-compensating prism pair 7 and 8 constituting the first dispersion compensating chirped mirror pair, 9 and 10 constituting the second dispersion compensating chirped microscopy, photonic crystal fiber 13 .

具体实施方式 Detailed ways

[0011] 下面结合附图和实施例对本发明做进ー步说明。 Figures and Examples The invention will be described further into ー [0011] The following binding.

[0012] 实施例 [0012] Example

[0013] 一种用于飞秒激光频率梳的扩谱装置,如图I所示,包括第一平面反射镜、第二平面反射镜、第三平面反射镜、第四平面反射镜、第五平面反射镜、色散补偿棱镜对、第一色散补偿啁啾镜对、第二色散补偿啁啾镜对和光子晶体光纤,其外围设备为基于差频腔原理的飞秒激光频率梳; [0013] A method for femtosecond laser frequency comb spreading apparatus shown in FIG. I, comprising a first planar mirror, a second plane mirror, the third mirror plane, the fourth plane mirror, a fifth a plane mirror, a prism for dispersion compensation, dispersion compensating chirped mirrors for a first, second dispersion compensating chirped mirrors and on photonic crystal fiber, a peripheral device is a femtosecond laser frequency based on the principle of difference frequency comb chamber;

[0014] 由飞秒激光频率梳产生的光谱范围为650nm〜950nm、脉宽为皮秒量级的飞秒激光脉冲,经过第一平面反射镜和第二平面反射镜反射后,注入色散补偿棱镜对进行飞秒激光的2阶色散补偿和脉宽压缩,之后经过第三平面反射镜反射后,注入第一色散补偿啁啾镜对继续进行色散补偿和脉冲压缩,之后再注入第二色散补偿啁啾镜对继续进行3阶色散补偿和脉冲压缩,上述过程后将飞秒激光脉冲的脉宽由皮秒的量级压缩至几十飞秒的量级,再经过第四平面反射镜和第五平面反射镜反射注入光子晶体光纤进行光谱展宽,从光子晶体光纤出射的飞秒激光脉冲的光谱范围达到600nm〜IOOOnm ; [0014] spectral range from the femtosecond laser frequency comb is produced 650nm~950nm, picosecond pulse width of the femtosecond laser pulses, after a first plane mirror and a second plane reflecting mirror, the dispersion compensating prism injection 2 performs a femtosecond laser-order dispersion compensation and pulse compression, after the third plane mirror reflector, Zhou injecting a second dispersion compensation to a first dispersion compensating chirped mirrors continued dispersion compensation and pulse compression, after re-injection 3 to continue the chirp mirror-order dispersion compensation and pulse compression, the pulse width after the above process is compressed by the femtosecond laser pulses on the order of the order of tens of picoseconds to femtoseconds, then through a fourth and a fifth plane mirror injection plane mirror reflector photonic crystal fiber for spectral broadening, the exit from the PCF spectral range of femtosecond laser pulses reaches 600nm~IOOOnm;

[0015] 上述飞秒激光频率梳脉冲的重复频率为350MHz,其发出的飞秒激光的平均功率约350mW,色散补偿棱镜对中两个棱镜的光程为70cm,其余路径以尽量简短为原则进行设计。 [0015] The repetition frequency of the femtosecond laser frequency comb pulses of 350MHz, the average power of the femtosecond laser that emits approximately 350mW, the dispersion-compensating prism pair in the optical path, two prisms 70cm, remaining paths as short as possible in principle design.

[0016] 以上所述为本发明的较佳实施例而已,本发明不应该局限于该实施例和附图所公开的内容。 [0016] The present invention is the above preferred embodiments, the present invention should not be limited to those embodiments disclosed embodiment and the drawings. 凡是不脱离本发明所公开的精神下完成的等效或修改,都落入本发明保护的范围。 Any equivalent or modified without departing from the spirit of the completion of the present invention is disclosed, fall within the scope of the present invention.

Claims (4)

1. 一种用于飞秒激光频率梳的扩谱装置,其外围设备为基于差频腔原理的飞秒激光频率梳,其特征在干: 包括第一平面反射镜、第二平面反射镜、第三平面反射镜、第四平面反射镜、第五平面反射镜、色散补偿棱镜对、第一色散补偿啁啾镜对、第二色散补偿啁啾镜对和光子晶体光纤; 由飞秒激光频率梳产生的飞秒激光,经过第一平面反射镜和第二平面反射镜反射后,注入色散补偿棱镜对进行飞秒激光的2阶色散补偿和脉宽压缩,之后经过第三平面反射镜反射后,注入第一色散补偿啁啾镜对继续进行色散补偿和脉冲压缩,之后再注入第二色散补偿啁啾镜对继续进行3阶色散补偿和脉冲压缩,再经过第四平面反射镜和第五平面反射镜反射注入光子晶体光纤进行光谱展宽。 A spreading apparatus for the femtosecond laser frequency comb, a peripheral device is a femtosecond laser frequency based on the principle of difference frequency comb chamber, characterized in that the dry: a first planar mirror, a second plane mirror, the third plane mirror, a fourth mirror plane, the fifth plane mirror, a prism for dispersion compensation, dispersion compensating chirped mirrors for a first, second dispersion compensating chirped photonic crystal fiber and microscope; manufactured by femtosecond laser frequency femtosecond laser comb generated, after the first plane mirror and a second plane reflecting mirror, the injection of the dispersion compensating prism 2-order dispersion compensation and pulse compression for femtosecond laser, through the third plane mirror after reflection after injecting a first dispersion compensating chirped mirror and dispersion compensation to proceed pulse compression, after re-injection of the second dispersion compensating chirped mirrors continued for 3-order dispersion compensation and pulse compression, and then through the fourth plane and the fifth plane mirror injection reflecting mirror PCF spectral broadening.
2.根据权利要求I所述的ー种用于飞秒激光频率梳的扩谱装置,其特征在于:所述飞秒激光频率梳产生的飞秒激光脉冲的光谱范围为650nm〜950nm、脉宽为皮秒量级,从第二色散补偿啁啾镜对发出的飞秒激光脉冲的脉宽的量级为几十飞秒,从光子晶体光纤出射的飞秒激光脉冲的光谱范围为600nm〜lOOOnm。 According to claim I for the species ー femtosecond laser frequency comb spreading means, characterized in that: the spectral range femtosecond laser frequency comb of the femtosecond laser is generated 650nm~950nm, width of picoseconds, from the second dispersion compensating chirped mirror magnitude of the pulse width of femtosecond laser pulses emitted is several tens of femtoseconds, emitted from the photonic crystal fiber spectral range of femtosecond laser pulses 600nm~lOOOnm .
3.根据权利要求I所述的ー种用于飞秒激光频率梳的扩谱装置,其特征在于:所述色散补偿棱镜对中两个棱镜的光程为70cm。 According to claim I of the species ー spreading means for femtosecond laser frequency comb, characterized in that: the dispersion-compensating prism pair optical path, two prisms 70cm.
4.根据权利要求I所述的ー种用于飞秒激光频率梳的扩谱装置,其特征在于:除去色散补偿棱镜对中两个棱镜的光程外,其余光程按照满足现场条件的路径最短为原则进行设计。 The I according ー seed spreading means for femtosecond laser frequency comb, as claimed in claim wherein: removing the dispersion-compensating prism pair in the two outer prisms of the optical path, the remaining optical path according to the path to meet site conditions The shortest design principle.
CN 201110085865 2011-04-06 2011-04-06 Spectrum spreading device for femtosecond laser frequency comb CN102162966B (en)

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CN1431740A (en) 2003-02-14 2003-07-23 中国科学院上海光学精密机械研究所 Optical parameter chatter pulses amplification laser system
CN1145243C (en) 2000-12-15 2004-04-07 中国科学院西安光学精密机械研究所 Four-colour femto second laser spectrum-extending beam-splitting orientation device

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CN1431740A (en) 2003-02-14 2003-07-23 中国科学院上海光学精密机械研究所 Optical parameter chatter pulses amplification laser system

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