Ytterbium-doped fiber laser (YDFL) and Thulium doped fiber laser (TDFL) have been two kinds of the most widely
studied fiber laser in recent years. Although both silica-based Ytterbium-doped fiber and Thulium doped fiber have wide
emission spectrum band (more than 200 nm and 400 nm, respectively), the operation spectrum region of previously
demonstrated high power YDFL and TDFL fall into 1060-1100 nm and 1900-2050nm. Power scaling of YDFL and
TDFL operates at short-wavelength or long-wavelength band, especially for extreme wavelength operation, although is
highly required in a large variety of application fields, is quite challenging due to small net gain and strong amplified
spontaneous emission (ASE). In this paper, we will present study on extreme wavelength operation of high power YDFL
and TDFL in our group. Comprehensive mathematical models are built to investigate the feasibility of high power
operation and propose effective technical methods to achieve high power operation. We have achieved (1) Diodepumped
1150nm long wavelength YDFL with 120-watt level output power (2) Diode-pumped 1178nm long wavelength
YDFL operates at high temperature with 30-watt level output power (3) Random laser pumped 2153nm long wavelength
TDFL with 20-watt level output power (4) Diode-pumped 1018nm short wavelength YDFL with a record 2 kilowatt
output power is achieved by using home-made fiber combiner.
We present novel and powerful pump schemes for fiber laser sources operating near 2 μm, which employing high power
Raman fiber lasers (RFLs) to provide sufficient pump light. Firstly, we demonstrate a Tm-doped fiber laser (TDFL) pumped
by two RFLs at 1173 nm. The output power of the TDFL reached 96 W with slope efficiency of 0.42, and the central
wavelength located at 1943.3 nm. This is the first TDFL with 100 W-level output power pumped by RFLs around Tm3+
ions’ ~1200 nm absorption band. Secondly, we demonstrate a Ho-doped fiber laser (HDFL) employing a 1150 nm RFL as
pump source. The 1150 nm RFL provided 110 W pump power and the output power of the HDFL reached 42 W with slope
efficiency of 0.37. The lasing wavelength covered from 2046.8 nm to 2049.5 nm with optical signal-to-noise ratio more
than 30 dB. This is the first HDFL pumped by a 1150 nm RFL and the highest output power achieved at this pump band. In
the last, we present a high power Ho-doped fiber (HDF) superfluorescent source (SS) pumped by a 1150 nm RFL. The SS’s
output power reached 1.5 W, and the full width at half maximum was about 30 nm. This is the highest output power
achieved in HDF as far as we know. The results above indicate promising and powerful pump schemes to achieve higher
power output in fiber lasers near 2 μm, which also can be further improved by optimizing the parameters of the sources.
We report on the mid-infrared supercontinuum laser output using a short piece of single-cladding Tm-Ho co-doped fiber,
pumped by a 1565 nm pulsed laser. The seed laser was amplified using a two-stage Er-doped master oscillation power
amplifier (MOPA). The seed laser was amplified to 260.8 mW with repetition rate of 100 kHz. The amplified 1565 nm
pulse laser passed through a piece of 500 m long single-mode 9/125 G652D communication fiber, then the laser was
injected into a 2 m long 9/125 Tm-Ho co-doped fiber. The laser had output power of ~ 20 mW, and the laser’s spectrum
was measured by an optical spectrum analyser (YOKOGAWA). By changing the 1565 nm seed laser’s repetition rate and
pulse duration, mid-infrared supercontinuum was generated. The energy levels of Tm3+ and Ho3+ icons acted with the
different wavelength of the pulse laser, then flat and broadband mid-infrared supercontinuum between 1800 nm ~ 2200 nm
was generated. The output power can be scaled up by increasing the 1565 nm laser’s power directly. This supercontinuum
generated by single-cladding Tm-Ho co-doped fiber may provide meaningful reference for mid-infrared supercontinuum
generation using other rare-dearth-doped fibers.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.