5 research outputs found
Dissipative Soliton Resonance: Adiabatic Theory and Thermodynamics
We present the adiabatic theory of dissipative solitons (DS) of complex
cubic-quintic nonlinear Ginzburg-Landau equation (CQGLE). Solutions in the
closed analytical form in the spectral domain have the shape of Rayleigh-Jeans
distribution for a purely real quintic nonlinearity. The DS parametric space
forms a two-dimensional (or three-dimensional for the complex quintic
nonlinearity) master diagram connecting the DS energy and a universal parameter
formed by the ratio of four real and imaginary coefficients for dissipative and
non-dissipative terms in CQGLE. The concept of dissipative soliton resonance
(DSR) is formulated in terms of the master diagram, and the main signatures of
transition to DSR are demonstrated and experimentally verified. We show a close
analogy between DS and incoherent (semicoherent) solitons with an ensemble of
quasi-particles confined by a collective potential. It allows applying the
thermodynamical approach to DS and deriving the conditions for the DS energy
scalability.Comment: 31 pages, 15 figure
A route to high peak power and energy scaling in the mid-IR chirped-pulse oscillator-amplifier laser systems
The paper introduces a new route towards the ultrafast high laser peak power
and energy scaling in a hybrid mid-IR chirped pulse oscillator-amplifier
(CPO-CPA) system, without sacrificing neither the pulse duration nor energy.
The method is based on using a CPO as a seed source allowing the beneficial
implementation of a dissipative soliton (DS) energy scaling approach, coupled
with a universal CPA technique. The key is avoiding a destructive nonlinearity
in the final stages of an amplifier and compressor elements by using a chirped
high-fidelity pulse from CPO. Our main intention is to realize this approach in
a Cr2+:ZnS-based CPO as a source of energy-scalable DSs with well-controllable
phase characteristics for a single-pass Cr2+:ZnS amplifier. A qualitative
comparison of experimental and theoretical results provides a road map for the
development and energy scaling of the hybrid CPO-CPA laser systems, without
compromising pulse duration. The suggested technique opens up a route towards
extremely intense ultra-short pulses and frequency combs from the multi-pass
CPO-CPA laser systems that are particularly interesting for real-life
applications in the mid-IR spectral range from 1 to 20 um.Comment: 16 pages, 14 figure
Регенеративный усилитель чирпированных фемтосекундных импульсов на основе кристалла Yb:CALYO для спектроскопии возбуждения-зондирования с высоким временным разрешением
Diode-pumped femtosecond chirped pulse regenerative amplifiers based on Yb³⁺-materials are of practical importance for wide range of scientific, industrial and biomedical applications. The aim of this work was to study the amplification of broadband chirped femtosecond pulses in regenerative amplifier based on Yb³⁺:CaYAlO₄ crystal. Such systems use femtosecond mode-locked lasers as seed pulse sources and amplify nJ-seed pulses to sub-mJ energy range. Most chirped pulse regenerative amplifier systems described in the literature use seed lasers with typical pulse spectral width at the level of 10–15 nm full width at half maximum (FWHM) that limit the seed pulse duration of about 90 fs and amplified pulse duration at the level of 200 fs due to strong influence of gain narrowing effect on the amplified pulse parameters. Yb³⁺-doped crystals with wide and smooth gain bandwidth as an active medium of chirped femtosecond pulse regenerative amplification systems allow to reduce negative contribution of gain narrowing effect and lead to shortening of amplified pulses. In this research we study the chirped pulse regenerative amplification of broad-band femtosecond pulses (60 nm spectral width FWHM) in the Yb³⁺:CaYAlO₄-based chirped pulse regenerative amplifier. Substantial reduction of the amplified pulse duration down to 120 fs (19.4 nm spectral width FWHM) with average power of 3 W at 200 kHz pulse repetition frequency was demonstrated without any gain narrowing compensation technique. The results of experimental investigation of broad-band seeded Yb³⁺:CaYAlO₄-based chirped pulse regenerative amplifier are reported for the first time to our knowledge. 120 fs-pulses (19.4 nm FWHM) with average output power of 3 W were demonstrated without any gain narrowing compensation technique. Despite the significant reduction of amplified pulse duration the task of improvement group velocity dispersion balance (including high orders of group velocity dispersion) remains relevant
Регенеративный усилитель чирпированных фемтосекундных импульсов на основе кристалла Yb:CALYO для спектроскопии возбуждения-зондирования с высоким временным разрешением
Diode-pumped femtosecond chirped pulse regenerative amplifiers based on Yb³⁺-materials are of practical importance for wide range of scientific, industrial and biomedical applications. The aim of this work was to study the amplification of broadband chirped femtosecond pulses in regenerative amplifier based on Yb³⁺:CaYAlO₄ crystal. Such systems use femtosecond mode-locked lasers as seed pulse sources and amplify nJ-seed pulses to sub-mJ energy range. Most chirped pulse regenerative amplifier systems described in the literature use seed lasers with typical pulse spectral width at the level of 10–15 nm full width at half maximum (FWHM) that limit the seed pulse duration of about 90 fs and amplified pulse duration at the level of 200 fs due to strong influence of gain narrowing effect on the amplified pulse parameters. Yb³⁺-doped crystals with wide and smooth gain bandwidth as an active medium of chirped femtosecond pulse regenerative amplification systems allow to reduce negative contribution of gain narrowing effect and lead to shortening of amplified pulses. In this research we study the chirped pulse regenerative amplification of broad-band femtosecond pulses (60 nm spectral width FWHM) in the Yb³⁺:CaYAlO₄-based chirped pulse regenerative amplifier. Substantial reduction of the amplified pulse duration down to 120 fs (19.4 nm spectral width FWHM) with average power of 3 W at 200 kHz pulse repetition frequency was demonstrated without any gain narrowing compensation technique. The results of experimental investigation of broad-band seeded Yb³⁺:CaYAlO₄-based chirped pulse regenerative amplifier are reported for the first time to our knowledge. 120 fs-pulses (19.4 nm FWHM) with average output power of 3 W were demonstrated without any gain narrowing compensation technique. Despite the significant reduction of amplified pulse duration the task of improvement group velocity dispersion balance (including high orders of group velocity dispersion) remains relevant