Formation of subwavelength grating on molybdenum mirrors using a femtosecond Ti:sapphire laser system operating at 10 Hz

Sharma, Ashok; Smedley, J.; Tsang, T.; Rao, T.

doi:10.1063/1.3569763

Cited by 8 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, it was observed that the spacing of FLIPSS produced on platinum at a laser fluence of 0.084J/cm 2 decreased from 0.62 to 0.55 μm with an increase in the number of laser shots from 30 to 500 due to modification of the FLIPSS morphology. This effect was also studied in (Mo), (NiTi alloy), (CuZn alloy, ZnO, diamond), and (Si). The effect of the laser fluence on the FLIPSS period was studied in .…”

Section: Femtosecond Laser‐induced Periodic Structures On Metalsmentioning

confidence: 99%

Direct femtosecond laser surface nano/microstructuring and its applications

Vorobyev

Chen

2012

Laser & Photonics Reviews

965

584

View full text Add to dashboard Cite

This paper reviews a new field of direct femtosecond laser surface nano/microstructuring and its applications. Over the past few years, direct femtosecond laser surface processing has distinguished itself from other conventional laser ablation methods and become one of the best ways to create surface structures at nano‐ and micro‐scales on metals and semiconductors due to its flexibility, simplicity, and controllability in creating various types of nano/microstructures that are suitable for a wide range of applications. Significant advancements were made recently in applying this technique to altering optical properties of metals and semiconductors. As a result, highly absorptive metals and semiconductors were created, dubbed as the “black metals” and “black silicon”. Furthermore, various colors other than black have been created through structural coloring on metals. Direct femtosecond laser processing is also capable of producing novel materials with wetting properties ranging from superhydrophilic to superhydrophobic. In the extreme case, superwicking materials were created that can make liquids run vertically uphill against the gravity over an extended surface area. Though impressive scientific achievements have been made so far, direct femtosecond laser processing is still a young research field and many exciting findings are expected to emerge on its horizon.

show abstract

Section: Femtosecond Laser‐induced Periodic Structures On Metalsmentioning

confidence: 99%

Direct femtosecond laser surface nano/microstructuring and its applications

Vorobyev

Chen

2012

Laser & Photonics Reviews

965

584

View full text Add to dashboard Cite

show abstract

“…A mechanically polished Mo plate with a purity of 99.98% was selected as the sample because of its high elasticity modulus and its thermal and electrical conductivity properties, which are useful for wide applications in microelectronics, photoelectronics, laser and space optics, and fusion reactors. , The experiments were implemented with a line-scanning method through the precise translation of the sample via a computer-controlled X-Y-Z stage (Newport, UTM100 PPE1). The focal laser spot on the sample surface, which was placed at a position 400 mm away from the focus to avoid air ionization disturbance, was measured as 2ω 0 = 80 μm (1/e 2 peak intensity) in diameter.…”

Section: Methodsmentioning

confidence: 99%

Homogeneous Nanostructuring of a Molybdenum Surface by Dual-Color Correlated Femtosecond Laser Irradiation for Solar Absorber Applications

Zhao,

Wang,

Yang

2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Disordered ridge-splitting on laser-induced periodic surface structures (LIPSSs) often reduces structure quality and degrades application performance but introduces a potential route for laser structuring accuracy with access to the deep-subwavelength scale. Here, nanolithography based on the homogeneous ridge-splitting mechanism is implemented on a molybdenum surface using two-color (400 and 800 nm) temporally delayed femtosecond laser pulses with identical linear polarizations. The achieved splitting LIPSS, with a periodicity down to 140 nm and a feature size down to 70 nm, was uniformly distributed in the long range without any wavy or interruption defects, presenting improvements on the structure’s accuracy and quality relative to the observation of single-beam femtosecond 400 nm laser irradiation. The generation and suppression of the homogeneous ridge-splitting phenomenon can be manipulated via altering the time delay or the fluences of the two-color laser pulses, which results in transitions between the regular near-subwavelength and deep-subwavelength LIPSSs. The underlying physical origins are attributed to the excitation of various electromagnetic field enhancement modes during the transiently correlated dynamic process of two-color laser–material interactions. Our investigations facilitate the laser nanostructuring of metals with an accessible 100 nm feature size, and the nanostructured Mo surface enables specific applications in the field of concentrated solar energy devices.

show abstract

“…Since the first experimental demonstration of laser and subsequent development of mode-locking and dispersion compensation techniques [1][2][3], there has been never ending quest [4][5] to generate laser pulses with increasing pulse energy, decreasing pulse duration with controlled space-time profiles and at higher pulse repetition rate for variety of scientific investigations and applications [6][7][8][9][10] e.g. generation of secondary sources of charged and neutral particles, THz to x-rays, coherent broadband sources in visible and IR range of electromagnetic radiation, modification of surface and bulk properties of optical materials etc.…”

Section: Introductionmentioning

confidence: 99%

Terawatt class space-time multiplexed chirped pulse amplification based Nd:glass laser system: development, performance characteristics and application

Sharma

2023

Preprint

View full text Add to dashboard Cite

Twin energetic sub-picosecond duration laser pulses have been generated in air using space-time multiplexed chirped pulse amplification based all Nd:phosphate glass laser system. Multiple beam-lets are generated using beam splitting prior to compression to reduce energy fluence on compressor gratings and to avoid vacuum compressor. Eight pass all reflective single grating half Martinez grating pulse stretcher and complimentary double pass mixed grating Treacy compressor has been setup to provide stretching/ compression factor of 6x103 for ~ 200 fs laser pulses at 1055 nm, to avoid excess optical nonlinearities during amplification and propagation through optical elements. Stretched laser pulse with energy of 150 pJ is amplified using regenerative and four-pass power amplifier with an output pulse energy exceeding 2 J at minimum shot to shot interval of 90 s. Amplified stretched pulses are compressed to full width in range from 450 fs to 900 fs at half maxima, with partial compensation of gain narrowing with spectral broadening owing to accumulated nonlinear phase. Various issues of pulse compression in mixed grating compressor are discussed. For demonstration purposes, laser pulses have been applied to study nonlinear properties and modification of optical materials in air.

show abstract

Formation of subwavelength grating on molybdenum mirrors using a femtosecond Ti:sapphire laser system operating at 10 Hz

Cited by 8 publications

References 32 publications

Direct femtosecond laser surface nano/microstructuring and its applications

Direct femtosecond laser surface nano/microstructuring and its applications

Homogeneous Nanostructuring of a Molybdenum Surface by Dual-Color Correlated Femtosecond Laser Irradiation for Solar Absorber Applications

Terawatt class space-time multiplexed chirped pulse amplification based Nd:glass laser system: development, performance characteristics and application

Contact Info

Product

Resources

About