Moiré volume Bragg grating filter with tunable bandwidth

Mokhov, Sergiy; Ott, Daniel; Divliansky, Ivan; Zel'dovich, Boris Ya; Glebov, Leonid

doi:10.1364/oe.22.020375

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…A certain tunability of these parameters can be realized in particular grating designs, because of the presence of transverse degrees of freedom in operation with VBGs. For example, besides the standard resonant wavelength shift with angular tuning of the reflective VBG [25], the variations in the grating parameters with parallel translation of the VBGs along the transverse coordinate have been used in [26], in order to tune the resonant wavelength, and in [27], so as to tune the transmission bandwidth of the resonant VBG cavity. The simplest approach to creating a VBG producing a tunable pulse duration is to cut a VBG with varying length from a glass wafer using a recorded standard uniform modulation pattern, as shown on the right of figure 4.…”

Section: General Discussion Of Pulse Reflection By Vbgmentioning

confidence: 99%

Stretching of picosecond laser pulses with uniform reflecting volume Bragg gratings

et al. 2017

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This study shows that a uniform reflecting volume Bragg grating (VBG) can be used as a compact monolithic stretcher of high-power picosecond laser pulses, which is important for cases in which chirped Bragg gratings with the required chirp rate are difficult to fabricate. When an incident short pulse propagates along a grating and experiences local Bragg diffraction, a chirp-free reflected stretched pulse with an almost rectangular shape is generated. The increase in the duration of the reflected pulse is approximately equal to twice the propagation time along the grating. We derive an analytic expression for the diffraction efficiency, which incorporates the incident pulse duration, grating thickness, and amplitude of the refractive index modulation, enabling selection of the optimum grating for pulse stretching. Theoretical models of the extended pulse profiles are found to be in good agreement with experimental autocorrelation measurements. We also propose a simple and reliable method to control the temporal parameters of high-power picosecond pulses using the same laser source and a VBG of variable thickness, which can simplify experiments requiring different pulse durations significantly.

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Section: General Discussion Of Pulse Reflection By Vbgmentioning

confidence: 99%

Stretching of picosecond laser pulses with uniform reflecting volume Bragg gratings

et al. 2017

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“…The simple powder-based sintering technique enabled us to dope the precursor material with metal ions in order to fabricate colored glasses for potential optical applications, such as optical filters. [46][47][48][49][50] Figure 5a shows the approach for sintering colored glasses, in which a solution of metal salt is pipetted and absorbed into the porous pressed pellet, followed by UHS. As shown in Figure 5b, the FeCl 3 ethanol solution-soaked pellet exhibited excellent transparency, indicating uniform absorption of the doping solution due to the capillary effect.…”

Section: Demonstration Of Functional Glasses Sintered Via Uhsmentioning

confidence: 99%

Rapid Pressureless Sintering of Glasses

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Zhao

Wang

et al. 2022

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Silica glasses have wide applications in industrial fields due to their extraordinary properties, such as high transparency, low thermal expansion coefficient, and high hardness. However, current methods of fabricating silica glass generally require long thermal treatment time (up to hours) and complex setups, leading to high cost and slow manufacturing speed. Herein, to obtain high‐quality glasses using a facile and rapid method, an ultrafast high‐temperature sintering (UHS) technique is reported that requires no additional pressure. Using UHS, silica precursors can be densified in seconds due to the large heating rate (up to 102 K s−1) of closely placed carbon heaters. The typical sintering time is as short as ≈10 s, ≈1–3 orders of magnitude faster than other methods. The sintered glasses exhibit relative densities of > 98% and high visible transmittances of ≈90%. The powder‐based sintering process also allows rapid doping of metal ions to fabricate colored glasses. The UHS is further extended to sinter other functional glasses such as indium tin oxide (ITO)‐doped silica glass, and other transparent ceramics such as Gd‐doped yttrium aluminum garnet. This study demonstrates an UHS proof‐of‐concept for the rapid fabrication of high‐quality glass and opens an avenue toward rapid discovery of transparent materials.

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“…Another novel variant of CBG is the one, when simultaneously two chirped gratings are recorded into the same volume with the same value of resonant ⁄ , but with slight longitudinal shift with respect to each other. A Moiré pattern of CBG (MCBG) thus is implemented; compare to Moiré VBG without chirp, studied in details in [7,8]. Figure 3a shows a particular example of the refractive index modulation profile in MCBG.…”

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confidence: 99%