Semiconductor-based low-noise 100 MHz chirped pulse laser source based on a theta cavity design with an intra-cavity etalon and long-term stabilization

2011 ◽  
Author(s):  
Dimitrios Mandridis ◽  
Charles Williams ◽  
Ibrahim Ozdur ◽  
Anthony Klee ◽  
Peter J. Delfyett
Keyword(s):  
Pulse Laser ◽  
Low Noise ◽  
Laser Source ◽  
Chirped Pulse ◽  
Cavity Design

Combined influence of axial electron temperature and exponential plasma density ramp on the self-focusing of a chirped laser in plasma

2020 ◽  
Vol 75 (7) ◽  
pp. 671-675
Author(s):  
Niti Kant ◽  
Vishal Thakur
Keyword(s):  
Electron Temperature ◽  
Pulse Laser ◽  
Plasma Density ◽  
Beam Width ◽  
Spot Size ◽  
Higher Order ◽  
The Self ◽  
Chirped Pulse ◽  
Self Focusing ◽  
Paraxial Ray

AbstractAn analysis of the self-focusing of highly intense chirped pulse laser under exponential plasma density ramp with higher order value of axial electron temperature has been done. Beam width parameter is derived by using paraxial ray approximation and then solved numerically. It is seen that self-focusing of chirped pulse laser is intensely affected by the higher order values of axial electron temperature. Further, influence of exponential plasma density ramp is studied and it is concluded that self-focusing of laser enhances and occurs earlier. On the other hand defocusing of beam reduces to the great extent. It is noticed that the laser spot size reduces significantly under joint influence of the density ramp and the axial electron temperature. Present analysis may be useful for the analysis of quantum dots, the laser induced fusion and etc.

Pulse-on-demand laser operation from nanosecond to femtosecond pulses and its application for high-speed processing

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jaka Petelin ◽  
Luka Černe ◽  
Jaka Mur ◽  
Vid Agrež ◽  
Jernej Jan Kočica ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Continuous Wave ◽  
Second Harmonic ◽  
Laser Source ◽  
Optical Modulator ◽  
Nanosecond Laser ◽  
Femtosecond Pulses ◽  
Chirped Pulse ◽  
On Demand ◽  
Nanosecond Pulses

Abstract In this manuscript we present a true pulse-on-demand laser design concept using two different approaches. First, we present a fiber master oscillator power amplifier (MOPA) based quasi-continuous wave (CW) laser, working at high modulation bandwidths, for generation of nanosecond pulses. Second, we present a hybrid chirped pulse amplification (CPA)-based laser, combining a chirped-pulse fiber amplifier and an additional solid-state amplifier, for generation of femtosecond pulses. The pulse-on-demand operation is achieved without an external optical modulator/shutter at high-average powers and flexible repetition rates up to 40 MHz, using two variants of the approach for near-constant gain in the amplifier chain. The idler and marker seed sources are combined in the amplifier stages and separated at the out using either wavelength-based separation or second harmonic generation (SHG)-generation-based separation. The nanosecond laser source is further applied to high throughput processing of thin film materials. The laser is combined with a resonant scanner, using the intrinsic pulse-on-demand operation to compensate the scanner’s sinusoidal movement. We applied the setup to processing of indium tin oxide (ITO) and metallic films on flexible substrates.

scholarly journals Laser speckle contrast imaging system using nanosecond pulse laser source

2020 ◽  
Vol 25 (05) ◽  
pp. 1
Author(s):  
Yuemei Zhao ◽  
Kang Wang ◽  
Weitao Li ◽  
Huan Zhang ◽  
Zhiyu Qian ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Imaging System ◽  
Nanosecond Pulse ◽  
Laser Speckle ◽  
Laser Source ◽  
Contrast Imaging ◽  
Laser Speckle Contrast Imaging ◽  
Speckle Contrast ◽  
Nanosecond Pulse Laser

Long term stable, synchronizable, low noise picosecond Ho:fiber NALM oscillator for Ho:YLF amplifier seeding

2022 ◽  
Author(s):  
Christoph Mahnke ◽  
Yi Hua ◽  
Yuxuan Ma ◽  
Haydar Salman ◽  
Thorsten Lamb ◽  
...  
Keyword(s):  
Low Noise

A Low-Noise Thermistor Bridge for Use in Calorimetry

1974 ◽  
Vol 20 (8) ◽  
pp. 1009-1012 ◽  
Author(s):  
Robert L Berger ◽  
Walter S Friauf ◽  
Horace E Cascio
Keyword(s):  
High Speed ◽  
Platinum Resistance Thermometer ◽  
Low Noise ◽  
Platinum Resistance ◽  
Resistance Thermometer ◽  
Thermistor Bridge ◽  
Flow Calorimeter ◽  
Titration Calorimeter ◽  
Lock In

Abstract A precision thermistor bridge and thermistor is described for use in a thermal titration calorimeter or a high-speed stopped- or continuous-flow calorimeter of the Roughton type. These are compared and evaluated with regard to several other types of detectors, including the platinum resistance thermometer, thermocouple, transistor thermometer, and capacitance thermometers. At this time the best detection for our purpose seems to be a specially constructed 20-100 kΩ thermistor used in conjunction with a new ac lock-in amplifier bridge. The sensitivity of the system is equivalent to a peak-to-peak noise of 25 x 10-6 °C, with a 100-ms time constant and 1 µW power dissipation in the thermistor. Long-term drift of the bridge, without an oven, was 1 x 10-6 °C/min.

scholarly journals A Yb:KGW dual-crystal regenerative amplifier

2020 ◽  
Vol 8 ◽  
Author(s):  
Huijun He ◽  
Jun Yu ◽  
Wentao Zhu ◽  
Xiaoyang Guo ◽  
Cangtao Zhou ◽  
...  
Keyword(s):  
Laser System ◽  
Regenerative Amplifier ◽  
Chirped Pulse ◽  
Pulse Amplification ◽  
Front End ◽  
Chirped Pulse Amplification ◽  
Gain Narrowing ◽  
Diode Pumped ◽  
Cavity Design ◽  
Output Laser

Abstract This study develops a Yb:KGW dual-crystal based regenerative amplifier. The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration. Sub-nanojoule pulses are amplified to 1.5 mJ with 9 nm spectral bandwidth and 1 kHz repetition rate using chirped pulse amplification technology. Consequently, 1.2 mJ pulses with a pulse duration of 227 fs are obtained after compression. Thanks to the cavity design, the output laser was a near diffraction limited beam with M2 around 1.1. The amplifier has the potential to boost energy above 2 mJ after compression and act as a front end for a future kilohertz terawatt-class diode-pumped Yb:KGW laser system.

scholarly journals Low-noise tunable deep-ultraviolet supercontinuum laser

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Callum R. Smith ◽  
Asbjørn Moltke ◽  
Abubakar I. Adamu ◽  
Mattia Michieletto ◽  
Patrick Bowen ◽  
...  
Keyword(s):  
Spectral Region ◽  
Tunable Laser ◽  
Low Noise ◽  
Laser Source ◽  
Efficient Energy Transfer ◽  
Significant Step ◽  
Deep Ultraviolet ◽  
Deep Uv ◽  
Nonlinear Compression

Abstract The realization of a table-top tunable deep-ultraviolet (UV) laser source with excellent noise properties would significantly benefit the scientific community, particularly within imaging and spectroscopic applications, where source noise has a crucial role. Here we provide a thorough characterization of the pulse-to-pulse relative intensity noise (RIN) of such a deep-UV source based on an argon (Ar)-filled anti-resonant hollow-core (AR HC) fiber. Suitable pump pulses are produced using a compact commercially available laser centered at 1030 nm with a pulse duration of 400 fs, followed by a nonlinear compression stage that generates pulses with 30 fs duration, 24.2 μJ energy at 100 kHz repetition rate and a RIN of < 1%. Pump pulses coupled into the AR HC fiber undergo extreme spectral broadening creating a supercontinuum, leading to efficient energy transfer to a phase-matched resonant dispersive wave (RDW) in the deep-UV spectral region. The center wavelength of the RDW could be tuned between 236 and 377 nm by adjusting the Ar pressure in a 140 mm length of fiber. Under optimal pump conditions the RIN properties were demonstrated to be exceptionally good, with a value as low as 1.9% at ~ 282 nm. The RIN is resolved spectrally for the pump pulses, the generated RDW and the broadband supercontinuum. These results constitute the first broadband RIN characterization of such a deep-UV source and provide a significant step forward towards a stable, compact and tunable laser source for applications in the deep-UV spectral region.

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