Junhong Su
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View article: Study on the duration of laser-induced air plasma flash near thin film surface
Study on the duration of laser-induced air plasma flash near thin film surface Open
The precision of testing the damage threshold of thin film lasers has always been a limiting factor in the advancement of high-power laser systems. The conventional plasma flash method sometimes fails to differentiate between film and air …
View article: Optical and laser damage resistance: Role of periodic cylindrical surfaces
Optical and laser damage resistance: Role of periodic cylindrical surfaces Open
Traditional laser thin film optical components are specially designed layered structures made of two or more materials. However, as the number of layers increases, the anti-laser damage ability of the optical elements is significantly redu…
View article: Quantifying Uncertainty in Laser-Induced Damage Threshold for Cylindrical Gratings
Quantifying Uncertainty in Laser-Induced Damage Threshold for Cylindrical Gratings Open
The laser-induced damage threshold (LIDT) is a key measure of an optical component’s resistance to laser damage, making its accurate determination crucial. Following the ISO 21254 standards, we studied the measurement strategy and uncertai…
View article: Study on the Duration of Laser-Induced Thin Film Plasma Flash
Study on the Duration of Laser-Induced Thin Film Plasma Flash Open
The accuracy of judging whether the film is damaged directly affects the accuracy of the measurement of the film laser damage threshold. When judging the film damage by the traditional plasma flash method, there is a problem of misjudgment…
View article: Study on the impulse mechanism of optical films formed by laser plasma shock waves
Study on the impulse mechanism of optical films formed by laser plasma shock waves Open
In a high-power laser system, when the surface pressure of the optical film caused by laser plasma shock wave is greater than the adhesion per unit area of the film layer, the film will produce mechanical damage, and in serious cases, the …
View article: Study on the Influence of Deposition Temperature on the Properties of Lanthanum Titanate Films
Study on the Influence of Deposition Temperature on the Properties of Lanthanum Titanate Films Open
The work aims to study the effect of deposition temperature on optical properties and residual stresses in Lanthanum titanate (H4) films. The LaTiO3 films were deposited by electron-beam thermal evaporation technique. The residual stress o…
View article: Study on the laser-induced damage of thin films by terahertz time-domain spectroscopy
Study on the laser-induced damage of thin films by terahertz time-domain spectroscopy Open
The undamaged and damaged areas of the ITO thin film deposited on a silicon substrate induced by laser with different energies were tested with the transmission terahertz time-domain spectroscopy system. Their time-domain spectra and frequ…
View article: Laser Protection Properties of Multi-Band Non-Regularized Highly Reflective Films
Laser Protection Properties of Multi-Band Non-Regularized Highly Reflective Films Open
With the increasing exploitation of lasers, single-band laser protection has been extensively studied. However, single-band laser protection techniques have remained expensive and failed to meet protection requirements for multi-band laser…
View article: A Study of Resolution Improvement in Noncoherent Optical Coherence Imaging
A Study of Resolution Improvement in Noncoherent Optical Coherence Imaging Open
Noncoherent light, as a common light source in life, can effectively avoid problems such as scattering noise caused by optical components incoherent light imaging, and through the design of the optical path can also trigger interference an…
View article: Study of the Explosive Bridge Film Using Laser Shaping Technology
Study of the Explosive Bridge Film Using Laser Shaping Technology Open
Laser shaping technology and its applications have gained widespread attention in different fields. Using laser repair technology prolongs the service life of micro-explosive products and reduces the production cost, as well as enables the…
View article: Optical and Laser-Induced Damage Characterization of Porous Structural Silicon Oxide Film with Hexagonal Period by Nanoimprint Lithography
Optical and Laser-Induced Damage Characterization of Porous Structural Silicon Oxide Film with Hexagonal Period by Nanoimprint Lithography Open
We designed and fabricated a porous nanostructured film with a hexagonal period for a high-power laser system. The proposed nanostructure exhibits polarization-independent, infrared, and antireflective properties. The measured transmittanc…
View article: Characterization of damage morphology of structural SiO<sub>2</sub> film induced by nanosecond pulsed laser
Characterization of damage morphology of structural SiO<sub>2</sub> film induced by nanosecond pulsed laser Open
We investigated the damage morphology of porous silicon oxide film with a periodic hexagonal hole array irradiated by nanosecond pulsed laser, both experimentally and numerically. To understand the damage morphology, the temperature field …
View article: Study of the length and influencing factors of air plasma ignition time
Study of the length and influencing factors of air plasma ignition time Open
When a high-energy laser acts on a film surface, plasma flashes of both the air and film can be generated simultaneously. However, when the conventional plasma flash method is used to identify thin film damage, there is a misjudgment probl…
View article: Polarization Characteristics of the Near-Field Distribution of One-Dimensional Subwavelength Gratings
Polarization Characteristics of the Near-Field Distribution of One-Dimensional Subwavelength Gratings Open
To improve the anti-laser damage performance of one-dimensional (1D) subwavelength gratings (SWGs), this paper proposes to reasonably reduce the peak electric field at the grating ridges to further reduce the laser damage caused by the ele…
View article: Optical characteristics of the undamaged and laser damaged K9 glass in terahertz band
Optical characteristics of the undamaged and laser damaged K9 glass in terahertz band Open
K9 glass is an important optical element of the high energy laser system. In an attempt to investigate the variation of optical properties of K9 glass before and after laser induced damage, based on the transmission terahertz time-domain s…
View article: Effects of oxygen flow on properties of La<sub>2</sub>Ti<sub>2</sub>O<sub>7−x</sub> films
Effects of oxygen flow on properties of La<sub>2</sub>Ti<sub>2</sub>O<sub>7−x</sub> films Open
In order to obtain the relationship between the properties and the oxygen flow rate of La 2 Ti 2 O 7−x film, the films were prepared by electron beam evaporation with various oxygen flow rates on Si and quartz substrates. The effects of ox…
View article: Roll angle measurement system based on differential plane mirror interferometer
Roll angle measurement system based on differential plane mirror interferometer Open
A precision roll angle measurement system based on differential plane mirror interferometer (DPMI) is proposed and the measurement principle has been analyzed theoretically in detail. This system uses DPMI with wedgy angle prism and wedgy …
View article: Effects of Deposition Temperature on Structural, Optical Properties and Laser Damage of LaTiO<sub>3</sub> Thin Films
Effects of Deposition Temperature on Structural, Optical Properties and Laser Damage of LaTiO<sub>3</sub> Thin Films Open
LaTiO 3 films were prepared under various deposition temperatures using electron beam evaporation on Si and fused quartz substrates. The relationship between the deposition temperature and structure and properties of optics was investigate…