Laser interaction with doped crystals exhibiting photon-photon and photon-phonon coupling has been focused on recently. In pretext, here we report the spectral and temporal profile interaction of two lasers excitation through various phases of Eu3+: BiPO4 crystals. We reveal that spectral-temporal profile interaction of hybrid signals (coexisting fluorescence and spontaneous four-wave mixing) are dressed by nested and cascade processes of two-photons (two-phonon). Such interaction comes from thermal phonon constructive and phase transition phonon destructive dressing. The spectral and temporal (profile) interactions are interrelated and reduced by about 2-times due to two-photon nested dressing in contrast to the interaction through the sum of each laser excitation. In contrast to a single laser, spectral (Fano)-dip interaction reduces by 2-times due to two-photon destructive dressing coupling. Moreover, thermal phonon dressing at 300K exhibits 3-times more extensive temporal interaction than that at 77K. The phase transition phonon dressing for a half hexagonal and half low-temperature monoclinic phase is about 1.5-times longer than that of the pure hexagonal phase of Eu3+: BiPO4. These results may help to understand the spectral-temporal relationship in the fields of nonlinear and quantum optics.

We compare the atomic coherence time of doped ion crystals, i.e., BiPO4: Eu3+, YPO4: Eu3+, YPO4: Pr3+, and Y2SiO5: Pr3 + crystals. Such atomic coherence time is controlled by crystal field splitting (CF-splitting) and optical (photon and phonon) dressing. Compared with the other doped ion crystals, BiPO4: Eu3+ exhibits the longest coherence time. By controlling thermal phonon, phase-transition phonon, broadband or narrowband excitation, and fluorescence (FL) or spontaneous four-wave-mixing ratio (S-FWM), a superior atomic coherence time of up to 10 ± 0.6 ms is achieved in the pure hexagonal (0.5:1) phase of BiPO4: Eu3+. Furthermore, the relationship between TAT-splitting and spectral Autler–Townes (SAT)-splitting was investigated. This superior atomic coherence time has potential applications in quantum memory devices.

<p><em>Borneo Project is a new business in the field of ordering services of various types of clothing. In doing its marketing strategy Borneo Project relies on marketing through friendship, word of mouth from one to another one and using social media as a marketing tool. This has not had a much positive effect on sales in Borneo Project. Therefore it is necessary to analyze the marketing strategy that can be applied in Borneo Project.</em></p><p><em>Determining the strategy carried out in three stages: an input stage, matching stage, and the stage of the decision. The input stage is done by using Internal Factor Evaluation Matrix (IFE) and External Factor Evaluation Matrix (EFE). In the IFE matrix, obtained a total score of 2.407, while the EFE Matrix obtained score of 2.831. Based on internal and external factor analysis then matching phase with IE Matrix method and SWOT Matrix. The final stage was the decision stage used QSPM method. QSPM is used to evaluate alternative strategies obtained in the SWOT Matrix, then rank them. The first rank is the strategy of applying for credit funds, seeking investors or business joint venture partners and seeking financial assistance from corporate CSR with the acquisition of power score Pull of 5,824. Alternative strategies are prioritized to be applied is to ask a credit fund, seek a joint venture partner and investor or business and are looking for financial aid CSR.</em><em></em></p><strong><em>Keywords: Marketing Strategy, Borneo Project, QSPM</em></strong>

We propose a multi-channel optical hybrid filter which can regulate into a single-channel narrowband filter (SCNBF), hybrid band filter (HBF), and the dual-channel narrow band filter (DCNBF) when the input is a broad signal. The multi-channel optical hybrid filter results from the multiple evolutions of the spectral linewidth of fluorescence (FL) signal and Stokes signal generated by the spontaneous four-wave mixing. These evolutions can be controlled by changing the extrinsic parameters (i.e., gate position, gate width, laser power, and detuning) in various phases of europium-doped BPO (Eu3+:BiPO4) as the extrinsic parameters manipulate the ratio of FL and Stokes in the composite signal (FL + Stokes) and select the energy levels. The composite signal contents vary as per the linewidth through the out-of-phase and in-phase k-vectors due to destructive and constructive interferences. The maximum bandwidth contrast we attained was 91% for SCNBF, 49% and 85% for HBF, and 90% and 88% for DCNBF.

We investigated the evolution of spectral intensity of the composite signal (Stokes (ES) + fluorescence (FL)) by varying time delay in different phases (tetragonal (T), hexagonal (H), (T + H) and (H + T)) of Eu3+:YPO4 and Pr3+:YPO4. In a composite signal, there exists a competition between FL and ES that can be modulated through dressing effect. We observed that dressing effect has strong dependence on dipole moment, transition probability and phase symmetry of atomic like media. The dressing suppression dip in H- and T-phase YPO4 is relatively weaker than mixed (H + T)-phase YPO, while the dressing effect is weaker in Eu3+:YPO4 as compared to Pr3+:YPO4. By adjusting the time delay, FL signal can be switched from suppression dip to enhancement peak and vice versa. Further, we explored intensity-difference squeezing and intensity-noise correlation between composite signal (FL + ES) and anti-Stokes under nonlinear phase modulated by time delay. Based on our spectral intensity results, we realized the model of dressing based switch.

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The confronting problem faced by the handicapped, paralyzed, disabled, and quadriplegic people is their independent mobility. They need external assistance to perform their daily life activities. This paper aims to solve that problem by smart designing and deployment of the robotic wheelchair for those who cannot perform their voluntary activities and movements. The proposed automated wheelchair comprises two parts; the first part is the user's helmet that works as a master device, and the second part is a slave device, a smart wheelchair. The master device consists of an accelerometer, microcontroller, and wireless transmitter, in which the Accelerometer recognizes the movements of the user's head and transmits the signal according to the tiltation of the user's head. Besides this, the slave device consists of a wireless receiver, microcontroller, Gyroscope, power MOSFETs, and DC geared motors mounted on a smart wheelchair, which response as per the instructions of the master device. Furthermore, the paper also provides a brief construction of this mechatronic and amphibian system using static and dynamic equations.

We study the hybrid bound states in continuum (BIC) in time and spectral domain obtained from Eu3+ /Pr3+ doped YPO4 and BiPO4 crystals. The spectral and time domain BIC originates...