Time-Frequency Real-Time Imaging of Ultrashort Laser Pulses with a Single Echelon Mirror

Sakaibara, Hiroyuki; Katayama, Ikufumi; Takeda, Jun

doi:10.1364/cleo.2010.jthe83

Cited by 1 publication

(1 citation statement)

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“…Images of the echelon mirror obtained by using a conventional laser microscope are also shown. 26) The echelon mirror is fabricated on a Ni block (10 Â 10 Â 10 mm 3 ) with 500 steps using a precise micromachining technique, and it is employed to generate a spatially encoded time delay for the probe pulses. Each step has a step width d 0 of 20 m and a step height h of 5 m; further, the surface roughness, <0:2 m, is sufficient for our purposes.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Time–Frequency Imaging of Ultrashort Laser Pulses Using an Echelon Mirror

Katayama

Sakaibara

Takeda

2011

Jpn. J. Appl. Phys.

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We demonstrate real-time time-frequency imaging for the autocorrelation traces of ultrashort laser pulses using an echelon mirror fabricated on a Ni block with 500 steps; the echelon mirror is employed to generate spatially encoded time delays for the probe pulses. By using the frequency-resolved optical gating (FROG) technique with the echelon mirror, the time-frequency images of ultrashort laser pulses were successfully mapped in real-time. The chirp characteristics of the laser pulses were also evaluated with the phase-retrieval procedure on a single-shot basis. Our technique provides significant advantages over conventional autocorrelation and FROG techniques, such as single-shot detection of time-frequency images, a small spot size at a nonlinear crystal, chirp-free characteristics of echelon mirrors, and ultrafast measurement capabilities by simply replacing the nonlinear crystal with samples. Hence, we believe that it becomes a powerful spectroscopic tool for monitoring ultrashort laser pulses and for investigating ultrafast dynamics of materials.

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Section: Introductionmentioning

confidence: 99%