We have observed various polarization domains and a giant self-mode-locked pulse in a 130 m long erbium-doped fiber laser without any mode-locking devices.By adjusting the intracavity polarization controller,we invest...We have observed various polarization domains and a giant self-mode-locked pulse in a 130 m long erbium-doped fiber laser without any mode-locking devices.By adjusting the intracavity polarization controller,we investigated the evolution process of the polarization domain with the varying cavity birefringence.When the birefringence was close to zero,the polarization domains split into multidomains,and finally a giant self-mode-locked pulse formed for the first time.We analyzed that the generation of the self-mode-locked pulse was related to the multiple subdomains ascribed to the strong coherent cross coupling between the orthogonal polarization light components in the long fiber cavity.展开更多
We demonstrated a method to improve the output performance of a Ti:sapphire laser in the long-wavelength lowgain region with an efficient stimulated Raman scattering process. By shifting the wavelength of the high-gai...We demonstrated a method to improve the output performance of a Ti:sapphire laser in the long-wavelength lowgain region with an efficient stimulated Raman scattering process. By shifting the wavelength of the high-gain-band Ti:sapphire laser to the long-wavelength low-gain region, high-performance Stokes operation was achieved in the original long-wavelength low-gain region of the Ti:sapphire laser. With the fundamental wavelength tuning from 870to 930 nm, first-order Stokes output exceeding 2.5 W was obtained at 930–1000 nm, which was significantly higher than that directly generated by the Ti:sapphire laser, accompanied by better beam quality, shorter pulse duration and narrower linewidth. Under the pump power of 42.1 W, a maximum first-order Stokes power of 3.24 W was obtained at960 nm, with a conversion efficiency of 7.7%. Furthermore, self-mode-locked modulations of first-and second-order Stokes generation were observed in Ti:sapphire intracavity solid Raman lasers for the first time.展开更多
The multi-peak spectrum of Ti: sapphire pulses observed experimentally under ultra-broad bandwidth conditions ( 【 15 fs pulse length) has been explained theoretically. It is shown that the self-phase-modulation effec...The multi-peak spectrum of Ti: sapphire pulses observed experimentally under ultra-broad bandwidth conditions ( 【 15 fs pulse length) has been explained theoretically. It is shown that the self-phase-modulation effect is equivalent to the process of degenerate four-wave frequency-mixing. Based on this theoretical underpinning, the presence or absence of a multipeak spectrum provides a practical measure of whether the intracavity group-velocity-dispersion is ideally compensated for or not.展开更多
基金supported by the National Key Research and Development Program of China(No.2018YFE0117400)National Natural Science Foundation of China(No.62275093)China Postdoctoral Science Foundation(No.2018M642823)。
文摘We have observed various polarization domains and a giant self-mode-locked pulse in a 130 m long erbium-doped fiber laser without any mode-locking devices.By adjusting the intracavity polarization controller,we investigated the evolution process of the polarization domain with the varying cavity birefringence.When the birefringence was close to zero,the polarization domains split into multidomains,and finally a giant self-mode-locked pulse formed for the first time.We analyzed that the generation of the self-mode-locked pulse was related to the multiple subdomains ascribed to the strong coherent cross coupling between the orthogonal polarization light components in the long fiber cavity.
基金supported by the National Natural Science Foundation of China(No.62175181)
文摘We demonstrated a method to improve the output performance of a Ti:sapphire laser in the long-wavelength lowgain region with an efficient stimulated Raman scattering process. By shifting the wavelength of the high-gain-band Ti:sapphire laser to the long-wavelength low-gain region, high-performance Stokes operation was achieved in the original long-wavelength low-gain region of the Ti:sapphire laser. With the fundamental wavelength tuning from 870to 930 nm, first-order Stokes output exceeding 2.5 W was obtained at 930–1000 nm, which was significantly higher than that directly generated by the Ti:sapphire laser, accompanied by better beam quality, shorter pulse duration and narrower linewidth. Under the pump power of 42.1 W, a maximum first-order Stokes power of 3.24 W was obtained at960 nm, with a conversion efficiency of 7.7%. Furthermore, self-mode-locked modulations of first-and second-order Stokes generation were observed in Ti:sapphire intracavity solid Raman lasers for the first time.
文摘The multi-peak spectrum of Ti: sapphire pulses observed experimentally under ultra-broad bandwidth conditions ( 【 15 fs pulse length) has been explained theoretically. It is shown that the self-phase-modulation effect is equivalent to the process of degenerate four-wave frequency-mixing. Based on this theoretical underpinning, the presence or absence of a multipeak spectrum provides a practical measure of whether the intracavity group-velocity-dispersion is ideally compensated for or not.
