Dual-wavelength Ytterbium-doped Fiber Laser Research Articles

Titania-carbon nanocomposite as a saturable absorber for generation passively ytterbium-mode locked pulses

Passively pulse dual-wavelength ytterbium-doped fiber laser (YDFL) around 1 μm utilizing titania–carbon nanocomposite (TiO2–C NC) thin film as the optical modulator is experimentally demonstrated. The TiO2–C NC thin-film reveals great nonlinear saturable absorption characteristics with a transmission difference of 24.06% at the lasing emission around the 1 μm region. Stable self-starting mode-locked emission with a pulse of ~8 ns and a repetition rate of 30.7 MHz was achieved at threshold exciting power of about 115 mW. By adapting the polarization controller (PC) together with the pump power, fundamental, third, and sixth harmonic frequencies can be switched to each other. The corresponding pulse durations to the third and sixth harmonic mode-locked were 6.8 and 1.8 ns, respectively. The corresponding maximum output power was 1.8 mW. This work opens up another way to build cost-effective, greatly stable optical modulators, and presents the option to build novel nanocomposite-based photonic devices with TiO2–C NC.

Tunable wavelength generation in the 1 µm region incorporating a 16-channel arrayed waveguide grating (AWG)

A tunable single- and dual-wavelength ytterbium-doped fiber laser, incorporating a 16-channel arrayed waveguide grating is proposed and demonstrated. The side mode suppression ratio from the proposed setup has an average value of 52.97 dB (single-wavelength generation) and 58.19 dB (dual-wavelength generation). The tunable dual wavelength ranged from 1039.98 nm to 1047.48 nm with wavelength spacing ranging from 0.50 nm to 7.5 nm. A stability test from the experiment shows a power variation of 0.8 dB, and a wavelength fluctuation of 0.02 nm indicates the stability and reliability of the proposed work.

Dual-wavelength ytterbium-doped fiber laser using microfiber and D-shaped polished fiber

This paper describes a dual-wavelength demonstration for a proposed ytterbium-doped fiber laser in the 1μm region. A microfiber and a D-shaped fiber, functioning as a wavelength selective filter, is inserted into the laser ring cavity setup to ensure a stable dual wavelength operation. The dual-wavelength output from both the microfiber and the D-shaped fiber possess a wavelength spacing of 4.01 and 4.62nm, respectively. Both the microfiber and D-shaped fiber use the ytterbium doped fiber as gain medium, and has a stable peak power and side-mode suppression ratio of more than 30dB.

Tunable dual-wavelength ytterbium-doped fiber laser using a strain technique on microfiber Mach-Zehnder interferometer.

In this paper, stable dual-wavelength generation using a strain technique for a ytterbium-doped fiber laser is successfully demonstrated. A microfiber-based Mach-Zehnder interferometer is inserted into the laser ring cavity and stretched using the xyz translation stage. Four sets of dual-wavelength output lasing are obtained when the strain is applied onto a microfiber. The dual-wavelength output possesses spacing between 7.12 and 11.59nm, with displacement from 2 to 190μm from the central wavelength. The obtained side-mode suppression ratio is ∼48 dBm, while the maximum power fluctuation and wavelength shift are less than 0.6dB and 0.01nm, respectively. The results demonstrate that this setup generates a stable dual-wavelength laser in the 1μm region.

Titanium dioxide-based Q-switched dual wavelength in the 1 micron region

In this work a passively Q-switched dual-wavelength ytterbium-doped fiber laser using a titanium dioxide-based saturable absorber is proposed and proven. The system also utilizes a side-polished fiber in a ring cavity configuration to obtain the desired pulse train. A stable dual-wavelength pulse output is obtained at 1034.7 and 1039.0 nm, with a maximum pulse energy of 2.0 nJ, and a shortest pulse width of 3.2 μs. The generated pulse train is stable, and has a pulse repetition rate from 31.2 to 64.5 kHz.

Generation of an ultra-stable dual-wavelength ytterbium-doped fiber laser using a photonic crystal fiber

This paper describes the demonstration of a simple ytterbium-doped fiber (YDF) laser that utilized a short length of photonic crystal fiber (PCF) in a ring cavity and adjustments to the polarization state of an incorporated polarization controller (PC) to achieve a stable dual-wavelength output. The dual-wavelength lasing operation exploited the Mach–Zehnder interferometer effect, and the laser output consistently achieved high power stability with a 0.8 dB fluctuation over a period of 30 min. This proposed setup has the capability for adjustable spacing of two lasing wavelengths from a minimum of 0.40 nm to a maximum of 3.40 nm, allowing for flexibility in dual-wavelength laser generation in addition to stable and reliable system features.

Generation of stable and narrow spacing dual-wavelength ytterbium-doped fiber laser using a photonic crystal fiber

We demonstrate the design and operation of novel narrow spacing and stable dual-wavelength fiber laser (DWFL). A 70-cm ytterbium-doped fiber has been chosen as the gain medium in a ring cavity arrangement. Our design includes a short length photonic crystal fiber, acting as a dual-wavelength stabilizer based on its birefringence coefficient and nonlinear behavior and tunable band pass filter (TBPF) to achieve narrow spacing spectrum lasing. Our laser output is considered to be highly stable, with power fluctuation less than 0.8 dB over a period of 15 min. The flexibility and tunability of TBPF, together with polarization controller enable the spacing tuning of the DWFL from 0.03 nm up to 0.07 nm for 1040 nm region, and 0.10 nm up to 0.40 nm for 1060 nm region. The tunable wavelength spacing shows the flexibility of the DWFL in addition to stable and reliable properties of fiber laser in 1-μm region.

Flat and compact switchable dual wavelength output at 1060 nm from ytterbium doped fiber laser with an AWG as a wavelength selector

A dual-wavelength ytterbium doped fiber laser with a narrowest spacing of 0.53 nm and widest spacing of 12.2 nm at 1064 nm is presented in this paper. An arrayed waveguide grating (AWG) together with an optical channel selector (OCS) have also been incorporated in the proposed setup that works as a switchable mechanism giving 23 different wavelength tunings. Producing an average output power of −8 dB m and side mode suppression ratio (SMSR) of 59.65 dB, this dual-wavelength fiber laser is quite stable with an output power variance as low as 0.47 dB giving it an advantage due to its switching ability and stable dual-wavelength output powers.

Switchable Dual-Wavelength Ytterbium-Doped Fiber Laser Based on a Few-Mode Fiber Grating

The authors propose and demonstrate a simple switchable dual-wavelength Ytterbium-doped fiber laser based on a few-mode fiber grating. The laser can be designed to operate in stable dual-wavelength or wavelength-switching modes, due to the polarization hole burning enhanced by the few-mode fiber grating. The lasing lines may be controlled only by a polarization controller. Stable operation is achieved at room temperature when the wavelength separation is 0.9 nm.