Femtosecond laser pulse spectrum shaping device and usage thereof

Abstract

The invention provides a femtosecond laser pulse spectrum shaping device and usage thereof, which relate to the technical field of laser pulse amplification. The femtosecond laser pulse spectrum shaping device comprises a beam splitting element, a first reflecting element, a second reflecting element, and a receiving element; the distances between the first reflecting element and / or the second reflecting element and the beam splitting element can be adjusted in real time, so that the optical path difference between beams respectively passing through the first reflecting element and the secondreflecting element is adjusted; to-be-shaped femtosecond laser pulse can be split by the beam splitting element, so that one reflected part of the beam is reflected to the receiving element by the first reflecting element, and the other transmitted part of the beam is reflected to the receiving element by the second reflecting element. The invention is intended to mitigate technical problems in the prior art, for example, the optical path difference can only be changed by changing medium refractivity.

Description

technical field

[0001] The invention relates to the technical field of laser pulse amplification, in particular to a femtosecond laser pulse spectrum shaping device and a method for using the same. Background technique

[0002] Chirped Pulse Amplification (CPA) technology has become the main means of pulse energy amplification in ultrashort laser pulse systems in time. Its realization method is: first introduce a certain dispersion of femtosecond or picosecond pulses, broaden the pulse width in the time domain to the order of picoseconds or even nanoseconds, form chirped laser pulses, and reduce the peak power. The chirped laser pulses are then passed through a neodymium glass or titanium sapphire main amplification system to amplify the energy, thus reducing the risk of component damage. Finally, after obtaining higher energy, the dispersion is compensated to compress the pulse width to the femtosecond level. CPA technology has brought revolutionary changes to the develop...

Examples

Embodiment 1

[0040] Such as Figure 1-Figure 2 As shown, the femtosecond laser pulse spectrum shaping device provided in this embodiment includes a beam splitting element 10, a first reflecting element 20, a second reflecting element 30 and a receiving element 80; the first reflecting element 20 and / or the second reflecting element The distance between 30 and the beam splitting element 10 can be adjusted in real time, thereby adjusting the optical path difference between the beams passing through the first reflective element 20 and the second reflective element 30 respectively; the femtosecond laser pulse to be shaped passes through the beam splitting element 10 can split beams, so that a part of the reflected beam is reflected to the receiving element 80 by the first reflective element 20 , and another part of the transmitted beam is reflected to the receiving element 80 by the second reflective element 30 .

[0041] Specifically, the femtosecond laser pulse spectrum shaping device includes...

Embodiment 2

[0065] This embodiment also provides a femtosecond laser pulse spectrum shaping method, based on the above-mentioned femtosecond laser pulse spectrum shaping device, comprising the following steps:

[0066] Laser emission: emitting femtosecond laser pulses to be shaped and stretched by the stretcher 70;

[0067] Distance adjustment: control the adjusting element to determine the length between the first reflective element 20 and / or the second reflective element 30 and the beam splitting element 10 respectively;

[0068] Laser beam splitting: the broadened femtosecond laser pulse is incident on the beam splitting element 10, a part of the beam is reflected by the beam splitting element 10 to the first reflective element 20, and the other part of the beam is transmitted by the beam splitting element 10 and then incident on the second reflective element 30 ;

[0069] Beam interference: the light beam passing through the first reflective element 20 is reflected to the receiving e...

technical field

[0001] The invention relates to the technical field of laser pulse amplification, in particular to a femtosecond laser pulse spectrum shaping device and a method for using the same. Background technique

[0002] Chirped Pulse Amplification (CPA) technology has become the main means of pulse energy amplification in ultrashort laser pulse systems in time. Its realization method is: first introduce a certain dispersion of femtosecond or picosecond pulses, broaden the pulse width in the time domain to the order of picoseconds or even nanoseconds, form chirped laser pulses, and reduce the peak power. The chirped laser pulses are then passed through a neodymium glass or titanium sapphire main amplification system to amplify the energy, thus reducing the risk of component damage. Finally, after obtaining higher energy, the dispersion is compensated to compress the pulse width to the femtosecond level. CPA technology has brought revolutionary changes to the develop...

Examples

Embodiment 1

[0040] Such as Figure 1-Figure 2 As shown, the femtosecond laser pulse spectrum shaping device provided in this embodiment includes a beam splitting element 10, a first reflecting element 20, a second reflecting element 30 and a receiving element 80; the first reflecting element 20 and / or the second reflecting element The distance between 30 and the beam splitting element 10 can be adjusted in real time, thereby adjusting the optical path difference between the beams passing through the first reflective element 20 and the second reflective element 30 respectively; the femtosecond laser pulse to be shaped passes through the beam splitting element 10 can split beams, so that a part of the reflected beam is reflected to the receiving element 80 by the first reflective element 20 , and another part of the transmitted beam is reflected to the receiving element 80 by the second reflective element 30 .

[0041] Specifically, the femtosecond laser pulse spectrum shaping device includes...

Embodiment 2

[0065] This embodiment also provides a femtosecond laser pulse spectrum shaping method, based on the above-mentioned femtosecond laser pulse spectrum shaping device, comprising the following steps:

[0066] Laser emission: emitting femtosecond laser pulses to be shaped and stretched by the stretcher 70;

[0067] Distance adjustment: control the adjusting element to determine the length between the first reflective element 20 and / or the second reflective element 30 and the beam splitting element 10 respectively;

[0068] Laser beam splitting: the broadened femtosecond laser pulse is incident on the beam splitting element 10, a part of the beam is reflected by the beam splitting element 10 to the first reflective element 20, and the other part of the beam is transmitted by the beam splitting element 10 and then incident on the second reflective element 30 ;

[0069] Beam interference: the light beam passing through the first reflective element 20 is reflected to the receiving e...

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