In this paper, a single frequency thulium doped silica fiber laser operating above 2 μm based on cascaded single-modemultimode- single-mode (SMS) fiber structures incorporating a Sagnac loop was experimentally demonstrated. Based on the theoretical analysis of the trans mission properties of the SMS fiber structure and mode selection characteristic of Sagnac loop, two cascaded SMS fiber devices with same multimode fiber lengths around 3.25 cm were used in our laser system to select the specific lasing wavelength above 2 μm as well as enhance the suppression of lasing around 1900 nm. And 6.5 m unpumped TDF was employed in Sagnac loop as saturable absorber to achieve single-frequency operation. Single-longitudinal-mode (SLM) operation of the fiber laser operating at 2004.05 nm was achieved with a signal to noise ratio (SNR) more than 60dB.
In this paper a single frequency thulium doped silica fiber(TDF) laser operating above 2 μm based on cascaded single-mode-multimode-single-mode(SMS) structures incorporating a Sagnac loop was experimentally demonstrated. Based on the theoretical analysis of the transmission properties of the SMS fiber structure and mode selection characteristic of Sagnac loop, two cascaded SMS fiber devices with same multimode fiber lengths around 3.24 cm were used in our laser system to select the specific lasing wavelength above 2 μm as well as enhancing the suppression of lasing around 1900 nm. And 6.5 m unpumped TDF were employed in Sagnac loop as saturable absorber to achieve single frequency operation. Single-longitudinal-mode operation of the fiber laser at 2004.05 nm has been achieved with a signal to noise ratio (SNR) more than 60dB.
We report on the generation of dual-wavelength noise-like pulse (NLP) from a passively mode-locked all-fiber laser based on multimode interference (MMI) effect. The theory to evaluate and design transmission spectrum of MMI filter is analyzed. A homemade MMI filter was employed in an Er-doped fiber ring laser with NPE configuration and dual-wavelength NLP at 1530 and 1600 nm was obtained with 3-dB bandwidth of 18.1 and 41.9 nm, respectively. The output had a signal-to-noise ratio higher than 35 dB and can achieve self-started operation.
1018nm short wavelength Yb3+-doped fiber laser can be widely used for tandem-pumped fiber laser system in 1 μm regime because of its high brightness and low quantum defect (QD). In order to achieve 1018nm short wavelength Yb3+-doped fiber laser with high output power, a steady-state rate equations considering the amplified spontaneous emission (ASE) and Stimulated Raman Scattering (SRS) has been established. We theoretically analyzed the ASE and SRS effects in 1018nm short wavelength Yb3+-doped fiber laser and the simulation results show that the ASE is the main restriction rather than SRS for high power 1018nm short wavelength Yb3+-doped fiber laser, besides the high temperature of fiber is also the restriction for high output power. We use numerical solution of steady-state rate equations to discuss how to suppress ASE in 1018nm short wavelength fiber laser and how to achieve high power 1018nm short-wavelength fiber laser.
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