Abstract
A 1.7 μm pulsed laser plays an important role in bioimaging, gas detection, and so on. Fiber gas Raman lasers (FGRLs) based on hollow-core photonic crystal fibers (HC-PCFs) provide a novel and effective method for fiber lasers operating at 1.7 μm. Compared with traditional methods, FGRLs have more advantages in generating high-power 1.7 μm pulsed lasers. This paper reviews the studies of 1.7 μm FGRLs, briefly describes the principle and characteristics of HC-PCFs and gas-stimulated Raman scattering (SRS), and systematical characterizes 1.7 μm FGRLs in aspects of output spectral coverage, power-limiting factors, and a theoretical model. When the fiber length and pump power are constant, a relatively high gas pressure and appropriate pump peak power are the key to achieving high-power 1.7 μm Raman output. Furthermore, the development direction of 1.7 μm FGRLs is also explored.
Highlights
In recent years, lasers operating in the 1.7 μm band (1650–1750 nm) have received much attention due to the growing number of promising applications, such as bioimaging, gas detection, medical treatment, and mid-infrared laser generation
We reviewed the studies of 1.7 μm Fiber gas Raman lasers (FGRLs) based on hollow-core photonic crystal fibers (HC-PCFs)
We briefly described the principle and characteristics of HC-PCFs and the gas stimulated Raman scattering (SRS) process and systematically characterized 1.7 μm FGRLs in aspects of output spectral coverage, power-limiting factors, and a theoretical model
Summary
Lasers operating in the 1.7 μm band (1650–1750 nm) have received much attention due to the growing number of promising applications, such as bioimaging, gas detection, medical treatment, and mid-infrared laser generation. It can be seen that the pulse widths of 1.7 μm pulsed lasers based on solid-core fibers are mostly in femtosecond and picosecond regions and their output average powers are mostly less than 1 W. Compared with traditional 1.7 μm pulsed fiber lasers, 1.7 μm FGRLs have unique advantages and strong competitiveness due to the characteristics of high power, high efficiency, continuous wavelength tunability, and a narrow linewidth. When the fiber length and pump power are constant, a relatively high gas pressure and appropriate pump peak power are the key to achieving high output Raman power in 1.7 μm FGRLs. In Section 5, we discuss the future development of 1.7 μm FGRLs based on HC-PCFs
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