Sensitivity Improvement of SPIDER by Applying a Crystal Dithering Technique

Tsermaa, Baatarchuluun; Myung-Whun, Kim; Lee, Keum Hwi; Kim, Jin Seung

doi:10.3938/jkps.54.1500

Cited by 3 publications

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“…The absorption coefficient and the refractive index are connected to the real and the imaginary part of the complex susceptibility function of a material. Usually, the detection of the information associated with the real part is difficult, but experimental techniques for obtaining phase information of the short laser pulses have been developed [8,9]. These techniques can stimulate studies related to the refractive index or phase change information during the TPA process.…”

Section: Introductionmentioning

confidence: 99%

“…∆𝝓(𝝎 𝒔 , 𝝉) ∝ 𝑹𝒆[𝑷 (𝟑) (𝝎 𝒔 , 𝝉)/𝐄 𝐩𝐫 * (𝝎 𝒔 )]. (9) Here, the third order polarization 𝑷 (𝟑) (𝝎 𝒔 , 𝝉) is depending on 𝝎 𝒔 , the frequency of transmitted light through the material and 𝝉, the time delay between pump and probe pulses. We can estimate ∆𝑰(𝝎 𝒔 , 𝝉) and ∆𝝓(𝝎 𝒔 , 𝝉) by using the Eqs.…”

Section: Introductionmentioning

confidence: 99%

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Spectral intensity and phase changes of short laser pulses by two-photon absorption

Tsogvoo

Myung-Whun

Munkhbaatar

2019

Journal of Modern Optics

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We calculated third order non-linear polarization to estimate the two-photon absorption of non-interacting two-level molecules in the transmission-type degenerate pump-probe geometry. The spectral intensity and the phase changes of the laser pulses when passing through a thin dielectric slab composed of the molecules were considered. We also investigated the effect of the decay rate of the molecules and the chirp of the pulses on their spectral intensity and phase changes.Since the slab is thin, we can approximate / ≈ ∆ /∆ and / ≈ ∆ /∆ .Here, ∆ (∆ ) corresponds to change of the signal intensity (phase) before the pump pulse. ∆ can be considered as the thin slab thickness . A conventional pump-probe experiments uses the self-heterodyne detection method, which measures the difference between the probe field and the reference field (or local oscillator). We are interested in obtaining the difference or change of the signals (i.e. ∆ and ∆ ). Therefore, we ignore the z-dependence of the polarization and collect the third order terms:By considering pulse -band widths much smaller than the pulse -center frequency, the intensity change ∆ and phase change (∆ ) are proportional to:∆ ( , ) ∝ [ ( ) ( , )/ * ( )]. (9)Here, the third order polarization ( ) ( , ) is depending on , the frequency of transmitted light through the material and , the time delay between pump and probe pulses. We can estimate ∆ ( , ) and ∆ ( , ) by using the Eqs. (2), (8), and (9) if the laser pulse field is known. RESULTS AND DISCUSSIONWe simulated the TPA signal of a thin dielectric slab in the conventional laser pulse pump-probe experiment. For the simulation, we used a Gaussian-shape electric field for both the pump and probe fields of which the spectrum has the following functional form:( ) = − ( − ) − ( ) . (10)

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectral intensity and phase changes of short laser pulses by two-photon absorption

Tsogvoo

Myung-Whun

Munkhbaatar

2019

Journal of Modern Optics

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“…As the SFG signal is proportional to the square of the crystal thickness, an angle-dithered, thick crystal yields significantly stronger signal. The crystal dithering technique has been successfully applied to the several pulse characterization techniques including FROG [14], XFROG [15] and SPIDER [16].…”

Section: Supercontinuum Pulse Characterizationmentioning

confidence: 99%

Characterization of Supercontinuum and Ultraviolet Pulses by Using XFROG

Tsermaa

Yang

Myung-Whun

et al. 2009

Journal of the Optical Society of Korea

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We present cross-correlation frequency-resolved optical gating (XFROG) measurements of supercontinuum pulses generated by using a photonic crystal fiber (PCF), and ultraviolet (UV) pulses generated by frequency doubling of infrared ultra-short pulses. Since supercontinuum pulses have broad spectra, XFROG measurement typically requires using an extremely thin nonlinear crystal which has a thickness of sub-ten microns. Instead of using such a thin crystal, we employed a relatively thick crystal which was mounted on a galvanometer in order to achieve a phase-matching over the whole spectral bandwidth of the supercontinuum pulses by a crystal-dithering technique. Experimental results of the retrieved phase and intensity were in fair agreement with the independently measured data.

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