Development of Dual-Wavelength Injection-Locked Pulsed Laser and its Application to Generation of an Ultrahigh- Repetition-Rate Train of Ultrashort Pulses

2006 ◽  
Author(s):  
Takashi Onose ◽  
Masayuki Katsuragawa ◽  
Kazuhiko Misawa
Keyword(s):  
Repetition Rate ◽  
Pulsed Laser ◽  
Ultrashort Pulses ◽  
Dual Wavelength

Self-started dual-wavelength mode-locking with well-controlled repetition rate difference

2021 ◽  
pp. 1-1
Author(s):  
Zhengru Guo ◽  
Tingting Liu ◽  
Junsong Peng ◽  
Yuanjun Zhu ◽  
Kun Huang ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Mode Locking ◽  
Dual Wavelength ◽  
Rate Difference

80-W dual-wavelength green pulsed laser based on a Yb-doped rod-type fiber amplifier

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Yong-Ho Cha ◽  
Yonghee Kim ◽  
Hyunmin Park ◽  
Gwon Lim ◽  
Do-Young Jeong
Keyword(s):  
Pulsed Laser ◽  
Fiber Amplifier ◽  
Dual Wavelength ◽  
Type Fiber

scholarly journals High Resolution EFTEM and PEELS of Ga/GaAs Nano–“Ice Cream Cones” Grown by Dual-Wavelength Pulsed Laser Deposition

2005 ◽  
Vol 11 (S02) ◽  
Author(s):  
C T Schamp ◽  
V P Oleshko ◽  
W A Jesser ◽  
B S Shivaram ◽  
J M Howe
Keyword(s):  
High Resolution ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Ice Cream ◽  
Laser Deposition ◽  
Dual Wavelength

Tunable and switchable dual-wavelength passively mode-locked fiber ring laser with high-energy pulses at a sub-100kHz repetition rate

2011 ◽  
Vol 284 (24) ◽  
pp. 5719-5722 ◽  
Author(s):  
Jiang-Li Dong ◽  
Wen-Cheng Xu ◽  
Zhi-Chao Luo ◽  
Ai-Ping Luo ◽  
Hui-Yi Wang ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Ring Laser ◽  
High Energy ◽  
Dual Wavelength ◽  
Fiber Ring Laser ◽  
Fiber Ring

Towards temperature controlled retinal laser treatment with a single laser at 10 kHz repetition rate

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mario Mordmüller ◽  
Viktoria Kleyman ◽  
Manuel Schaller ◽  
Mitsuru Wilson ◽  
Dirk Theisen-Kunde ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Laser Treatment ◽  
Repetition Rate ◽  
Continuous Wave ◽  
Cell Damage ◽  
Pulsed Laser ◽  
Extended Kalman Filtering ◽  
Tissue Heating ◽  
Pulsed Heating ◽  
Measurement And Control

Abstract Laser photocoagulation is one of the most frequently used treatment approaches in ophthalmology for a variety of retinal diseases. Depending on indication, treatment intensity varies from application of specific micro injuries down to gentle temperature increases without inducing cell damage. Especially for the latter, proper energy dosing is still a challenging issue, which mostly relies on the physician’s experience. Pulsed laser photoacoustic temperature measurement has already proven its ability for automated irradiation control during laser treatment but suffers from a comparatively high instrumental effort due to combination with a conventional continuous wave treatment laser. In this paper, a simplified setup with a single pulsed laser at 10 kHz repetition rate is presented. The setup combines the instrumentation for treatment as well as temperature measurement and control in a single device. In order to compare the solely pulsed heating with continuous wave (cw) tissue heating, pulse energies of 4 µJ were applied with a repetition rate of 1 kHz to probe the temperature rise, respectively. With the same average laser power of 60 mW an almost identical temporal temperature course was retrieved in both irradiation modes as expected. The ability to reach and maintain a chosen aim temperature of 41 °C is demonstrated by means of model predictive control (MPC) and extended Kalman filtering at a the measurement rate of 250 Hz with an accuracy of less than ±0.1 °C. A major advantage of optimization-based control techniques like MPC is their capability of rigorously ensuring constraints, e.g., temperature limits, and thus, realizing a more reliable and secure temperature control during retinal laser irradiation.

Detector Array for Measuring Temporal-Spatial Distribution of High-Repetition-Rate Pulsed Laser Beam Profile

2013 ◽  
Vol 40 (6) ◽  
pp. 0608003
Author(s):  
冯国斌 Feng Guobin ◽  
王振宝 Wang Zhenbao ◽  
冯刚 Feng Gang ◽  
杨鹏翎 Yang Pengling ◽  
王群书 Wang Qunshu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Laser Beam ◽  
Repetition Rate ◽  
Pulsed Laser ◽  
High Repetition Rate ◽  
Beam Profile ◽  
Detector Array ◽  
Laser Beam Profile ◽  
High Repetition ◽  
Pulsed Laser Beam

Ultrafast Pulsed Laser Deposition of Chalcogenide Glass Films for Low-loss Optical Waveguides

2003 ◽  
Vol 780 ◽  
Author(s):  
B. Luther-Davies ◽  
V. Z. Kolev ◽  
M. J. Lederer ◽  
R. Yinlan ◽  
M. Samoc ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Repetition Rate ◽  
Pulsed Laser ◽  
Fused Silica ◽  
Laser Deposition ◽  
Process Conditions ◽  
High Optical Quality ◽  
Optical Films ◽  
Wide Range ◽  
Deposited Films

AbstractUltra-fast pulsed laser deposition using high-repetition-rate short-pulse lasers has been shown to provide high optical quality, super smooth thin films free of scattering centres. The optimized process conditions require short ps or sub-ps pulses with repetition rate in the range 1-100 MHz, depending on the target material. Ultra-fast pulsed laser deposition was used to successfully deposit atomically-smooth, 5micron thick As2S3 films. The as-deposited films were photosensitive at wavelengths close to the band edge (≈520 nm) and waveguides could be directly patterned into them by photo-darkening using an Argon ion or frequency doubled Nd:YAG laser. The linear and nonlinear optical properties of the films were measured as well as the photosensitivity of the material. The optical losses in photo-darkened waveguides were <0.2 dB/cm at wavelengths beyond 1200nm and <0.1 dB/cm in as-deposited films. The third order nonlinearity, n2,As2S3, was measured using both four-wave mixing and the z-scan technique and varied with wavelength from 100 to 200 times fused silica (n2,Silica ≈3×10-16 cm2/W) between 1500nm and 1100nm with low nonlinear absorption.Encouraged by the Ultrafast laser deposition results, we have built a new specialized modelocked picosecond laser system for deposition of optical films and for laser formation of nanoclusters. The newly developed “state of the art” powerful Nd:YVO laser can operate over a wide range of wavelengths, intensities, and repetition rates in MHz range. A brief description of the 50W laser installation is presented.

scholarly journals Charge-Line Dual-FET High-Repetition-Rate Pulsed Laser Driver

2019 ◽  
Vol 9 (7) ◽  
pp. 1289 ◽  
Author(s):  
Mateusz Żbik ◽  
Piotr Wieczorek
Keyword(s):  
Laser Diode ◽  
Repetition Rate ◽  
Field Effect Transistors ◽  
High Reliability ◽  
Pulsed Laser ◽  
High Repetition Rate ◽  
High Repetition ◽  
Laser Driver ◽  
Charge Line ◽  
Digital Circuitry

Most modern pulsed laser systems require versatile laser diode drivers. A state-of-the-art pulsed laser driver should provide precise peak power regulation, high repetition rate, and pulse duration control. A new, charge line dual-FET transistor circuit structure was developed to provide all these features. The pulsed modulation current is adjustable up to Imax = 1.2 A, with the laser diode forward voltage acceptable up to UF max = 20 V. The maximum repetition rate is limited by a charge line circuit to frep max = 20 MHz. Compared to the conventional single transistor drivers, the solution proposed in this paper allows a precise, high resolution width regulation to be obtained, whereas a low pulse jitter is ensured. In the solution, two separate, out-of-phase signals are used to trigger the individual Field Effect Transistors (FET). The resultant pulsed modulation current full-width-at-half-maxima (FWHM) is regulated from ~200 ps up to 2 ns. All control and timing signals are generated with a popular Field-Programmable Gate Array (FPGA) digital circuitry. The use of standard FPGA devices ensures the low cost and high reliability of the circuit, which are not available in laser drivers consisting of sophisticated analogue adjustable delay circuits.

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