All-fiber spatiotemporal self-similar laser.

Self-similar evolution has garnered significant attention in the field of high-power ultrafast fiber lasers due to its unique characteristics, such as wave-breaking suppression and quasi-linear chirp properties. Here, we demonstrate the spatiotemporal similariton generation in an all-fiber laser system through dual-function spectral-spatial filtering enabled by a commercial single-mode fiber filter. The system delivers similaritons centered at 1066 nm with M≈2.

Optical pulse processor based on achromatic time lens assisted by compound phase modulation.

The time-lens based optical pulse processors have been widely applied in ultrafast optical processing and quantum optics. Conventionally, the time-lens systems used to adopt a sinusoidal waveform to approximate quadratic temporal phase modulation. It inevitably restricts the duration of a linear chirp, and thus limiting the temporal aperture to realize perfect Fourier transform.

Tunable multi-wavelength generation of an integrated self-injection locking laser based on the Vernier effect.

A narrow-linewidth laser based on self-injection locking has found widespread applications, including wavelength division multiplexing, sensing, and LiDAR detection. Although self-injection locking can support multi-wavelength operation, conventional implementations have typically been bulky and constrained by limited wavelength spacing. In this paper, we demonstrate an integrated multi-wavelength self-injection locking (MWSIL) laser capable of generating multiple narrow-linewidth outputs with tunable spacing.

Three-electrode germanium-on-silicon avalanche photodiode array.

In this Letter, we report a bridge-connected three-electrode germanium-on-silicon (Ge-on-Si) avalanche photodiode (APD) array compatible with the complementary metal-oxide semiconductor (CMOS) process. In addition to the two electrodes on the Si substrate, a third electrode is designed for Ge. A single three-electrode APD was tested and analyzed.

On-chip generation of Bessel-Gaussian beam via concentrically distributed grating arrays for long-range sensing.

Bessel beam featured with self-healing is essential to the optical sensing applications in the obstacle scattering environment. Integrated on-chip generation of the Bessel beam outperforms the conventional structure by small size, robustness, and alignment-free scheme. However, the maximum propagation distance (Z) provided by the existing approaches cannot support long-range sensing, and thus, it restricts its potential applications.

Two-dimensional multi-layered SiN-on-SOI optical phased array with wide-scanning and long-distance ranging.

Silicon based optoelectronic integrated optical phased array is attractive owing to large-dense integration, large scanning range and CMOS compatibility. In this paper, we design and fabricate a SiN-on-SOI two-dimensional optical phased array chip. We demonstrate a two-dimensional scanning range of 96°×14.

60.4 W continuous-wave single-frequency laser output from a two-stage Nd:YAG single-crystal fiber amplifier.

A Nd:YAG single-crystal fiber amplifier for the amplification of continuous-wave single-frequency laser end-pumped by a laser diode (LD) is investigated. With a two-stage amplification configuration, an output power of 60.4 W under the total incident pump power of 200 W is achieved, which is, to our knowledge, the highest power from a continuous-wave single-frequency laser achieved with a single-crystal fiber scheme.

Investigation and demonstration of a high-power handling and large-range steering optical phased array chip.

The optical power handling of an OPA scanning beam determines its targeted detection distance. So far, a limited number of investigations have been conducted on the restriction of the beam power. To the best of our knowledge, we for the first time in this paper explore the ability of the silicon photonics based OPA circuit for the high power application.

Ultrafast fiber laser based on HfSe saturable absorber.

We demonstrate the HfSe saturable absorber (SA) for the generation of ultrafast pulse laser. The HfSe SA device is fabricated by integrating HfSe nanosheets (NSs) with a microfiber. The material and optical characteristics of HfSe NSs show their high quality.

Watt-level passively mode-locked Tm:YLF laser at 1.83 µm.

Passive, continuous-wave mode-locked (CWML) operation of a 1.83 µm Tm:YLF laser is experimentally demonstrated for the first time, to the best of our knowledge. Two specially selected output couplers are used to realize this operation.

High-power and high-efficiency short wavelength operation of a Tm:YLF laser at 1.83 μm.

A high-power and high-efficiency diode-end-pumped Tm:YLF laser at 1.83 μm is demonstrated for the first time, to our best knowledge. To make the laser operate at 1.

High-repetition-rate single-frequency Ho:YAG MOPA system.

A stable, 2.09 μm single-frequency Ho:YAG master oscillator and power amplifier (MOPA) system at a pulse repetition frequency of 1.25 kHz is demonstrated.

High-energy, stable single-frequency Ho:YAG ceramic amplifier system.

We demonstrate a 2090 nm single-frequency, high-energy, Q-switched Ho:YAG ceramic master oscillator and power amplifier system that contains two-stage amplifiers. The maximum single-frequency pulse energy is 55.64 mJ at a pulse repetition frequency of 200 Hz.

1 kHz single-frequency 2.09 μm Ho:YAG ring laser.

In this paper, we report the experimental realization of a high-repetition-rate single-frequency Ho-doped yttrium aluminum garnet (Ho:YAG) ring laser at 2.09 μm. Single-frequency operation of the ring laser is achieved by injection-seeding with a continuous wave (CW) Ho:YAG non-planar ring oscillator (NPRO) laser.

44 mJ, 2.1 μm single-frequency Ho:YAG amplifier.

A single-frequency two-stage amplifier delivering up to 44 mJ at 2.1 μm is demonstrated. The first-stage amplifier is double-end-pumped by a 1.

Single-frequency, injection-seeded Q-switched Ho:YAG ceramic laser pumped by a 1.91μm fiber-coupled LD.

A 2090 nm injection-seeded Q-switched Ho:YAG ceramic laser pumped by a 1.91 μm fiber-coupled LD is demonstrated in this paper. Single-frequency operation of Q-switched Ho:YAG ceramic laser is achieved by injection seeding technique.

34 mJ Ho:YAG ceramic master oscillator and power amplifier laser at 2097 nm.

We demonstrated a 2097 nm Ho:YAG ceramic master oscillator and power amplifier system pumped by Tm:YLF lasers. Laser characteristics of 0.6 at.

Measuring OAM states of light beams with gradually-changing-period gratings.

A method to measure orbital angular momentum (OAM) states of light beams by using gradually-changing-period gratings is reported. Two kinds of gradually-changing-period gratings were used for the measurement of OAM states. The OAM states of the incident beam can be measured easily from the Hermite-Gaussian-like diffraction patterns.

Generation of optical vortices by using spiral phase plates made of polarization dependent devices.

A method to construct spiral phase plates (SPPs) from quarter-wave plates and spatially variable half-wave plates (SVHWPs) is proposed. Optical vortices were experimentally generated by using SPPs made of polarization-dependent devices. The topological charge of the optical vortex can be also determined by the structure of the SVHWP and the polarization of the incident beam.