scholarly journals Generation and Characterization of Mid-Infrared Supercontinuum in Bulk YAG Pumped by Femtosecond 1937 nm Pulses from a Regenerative Amplifier

2019 ◽  
Vol 9 (16) ◽  
pp. 3399 ◽  
Author(s):  
Seyed Ali Rezvani ◽  
Yutaka Nomura ◽  
Takao Fuji
Keyword(s):  
Pump Pulse ◽  
Phase Modulation ◽  
Cross Correlation ◽  
Seed Pulse ◽  
Regenerative Amplifier ◽  
Mid Infrared ◽  
Optical Gating ◽  
Full Characterization ◽  
Insight Into

We have demonstrated the generation of supercontinuum (SC) pulses in bulk, using femtosecond pulses directly derived from a Tm:YAP regenerative amplifier. The SC spans from 380 nm–4 μ m. Such an SC combined with the applied 1937-nm pump pulse can be used in a mid-infrared optical parametric amplifier (MIR-OPA). A full characterization of the phase and stability of the SC provides important insight into the performance of such MIR-OPA systems. Using cross-correlation frequency-resolved optical gating (XFROG), we characterized the properties of the MIR section of the SC that can be used as a seed pulse in an MIR-OPA system. The pulse-to-pulse instability rooted in the intrinsic properties of the self-phase modulation process was observed in the retrieved trace and spectrum of the SC. In addition, the effect of the pump pulse quality was studied on the obtainable SC pulses.

scholarly journals High harmonic generation in solids driven by sub-cycle mid-infrared pulses from laser filamentation

2019 ◽  
Vol 205 ◽  
pp. 02023
Author(s):  
Fumitoshi Kumaki ◽  
Hideto Shirai ◽  
Yutaka Nomura ◽  
Takao Fuji
Keyword(s):  
Crystalline Silicon ◽  
Input Pulse ◽  
High Harmonic ◽  
Ultraviolet Region ◽  
Silicon Membrane ◽  
Mid Infrared ◽  
Optical Gating ◽  
Direct Band ◽  
Laser Filamentation

Carrier-envelope phase (CEP) controlled subcycle mid-infrared pulses from two-color laser filamentation have been applied for high harmonic (HH) generation in a crystalline silicon membrane. The HH spectrum reaches the ultraviolet region (<300 nm), beyond the direct band gap of the silicon. The shape of the HH spectrum shows the strong dependency on the CEP of the input pulse. The complete waveform characterization of the sub-cycle driver pulse with frequency-resolved optical gating capable of CEP determination is the effective method for the studies of the sub-cycle dynamics.

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