Pulse Shaping of Broadband Adiabatic SHG in Ti-Sapphire Oscillator

TL;DR

This paper demonstrates efficient broadband second harmonic generation in a Ti:sapphire oscillator using an adiabatic aperiodically poled KTP crystal, enabling pulse shaping and control for nonlinear spectroscopy and imaging.

Contribution

It introduces a novel adiabatic aperiodically poled KTP crystal for broadband SHG with flat conversion and pulse shaping capabilities.

Findings

Achieved over 35nm wavelength conversion in broadband SHG.

Demonstrated spectral-phase control including abs-value and π-step.

Enabled wavelength-tunable pump-probe and amplitude modulation.

Abstract

We experimentally demonstrate an efficient broadband second harmonic generation process with tunable mode-locked Ti: sapphire oscillator. We have achieved a robust broadband and efficient flat conversion of more than 35nm wavelength, by designing an adiabatic aperiodically poled potassium titanyl phosphate (KTP) crystal. Moreover, we have shown that with such efficient flat conversion, we can shape and control broadband second harmonic pulses. More specifically, we assign spectral-phase of abs-value and {\pi}-step, which allows wavelength tunable intense pump-probe and amplitude modulation of the broadband second harmonic output. Such spectral phases serve as a proof of concept for other pulse-shaping application for nonlinear spectroscopy and imaging.