Ted in this study are available on reasonable request in the
Ted in this study are available on affordable request from the corresponding author.Photonics 2021, 8,eight ofAcknowledgments: The help of Fonds europ n de d eloppement r ional (FEDER) along with the Walloon region under the Operational Plan “Wallonia-2020.EU” (project CLEARPOWER) is gratefully acknowledged. Conflicts of Interest: The authors declare no conflict of interest.
hvphotonicsArticleSimultaneous Enhancement of Contrast and Energy of Femtosecond Laser Pulses by Nonlinear InterferometerYasser Nada 1, and Efim Khazanov1Physics Division, Faculty of Science, Menofia University, Shibin El-Kom, Menofia 32511, Egypt Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia; [email protected] Correspondence: [email protected]: We showed that the nonlinear Mach ehnder interferometer could possibly be made use of not merely for enhancing temporal contrast, as proposed earlier, but in addition for increasing pulse power as a consequence of effective pulse compression. The interferometer introduces into the output pulse a nonlinear phase equal to /2. This allows escalating laser energy by a aspect of 1.five only by implies of a chirped mirror. Use of an added nonlinear plate results in a multi-fold power boost retaining the contrast enhancement. Keywords and phrases: nonlinear Mach ehnder interferometer; post compression; femtosecond laser pulse contrast; self phase modulation1. Introduction Higher temporal contrast has a vital part in experiments on studying the behavior of matter in extreme light fields. Temporal contrast would be the ratio of the intensity at the peak with the pulse towards the intensity on its pedestal. The pedestal appears, as a rule, due to amplified spontaneous emission in laser amplifiers of CPA lasers (chirped pulse amplification) [1], or because of amplified parametric emission in OPCPA lasers (optical parametric chirped pulse amplification) [2]. Probably the most well-liked Cuminaldehyde Data Sheet methods for contrast enhancement are plasma mirrors [3], harmonic generation [4], and cross-polarized wave (XPW) generation [5]. XPW is based on cubic nonlinearity. Not too long ago, several new tips have already been proposed for contrast enhancement, by suggests of a nonlinear phase induced by cubic nonlinearity: spectral filtering [6,7], spatial filtering [8], a nonlinear polarization interferometer [9], as well as a nonlinear Mach ehnder interferometer with symmetric arms [10]. In the latter case, the phase difference without non-linearity L equals , along with the Dicycloverine (hydrochloride) supplier radiation of your pedestal will not pass towards the dark port (see Figure 1a). On the contrary, the main pulse acquires a nonlinear phase B (B-integral) in a single channel, and a zero nonlinear phase in an additional 1. If B is nonzero, then the dark port doesn’t become totally dark. If B = , then the dark port becomes a light port, and the big part of the key pulse comes by means of this port. As a result, the contrast are going to be infinitely high if = . In practice, the contrast enhancement is determined by the inaccuracy of meeting the situation = . Due to self-phase modulation (SPM) inside a nonlinear medium, and subsequent reflection from the chirped mirror (CM), the pulse might be compressed, and hence the peak energy increases. The approach is named TFC (thin film compression) [11], CafCA (compression following compressor strategy) [12], or post-compression [13]. For pulses with power of tens of Joules [146], the a number of compression of femtosecond laser pulses was demonstrated with just about no energy loss; for a lot more facts, see the assessment [17]. In th.
