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Structured light arrays of various shapes have been a cornerstone in optical science, driven by the complexities of precise and adaptable generation. This study introduces an approach using a spatial light modulator (SLM) as a generator for these arrays. By projecting a holographic mask onto the SLM, it functions simultaneously as an optical convolution device, focusing mechanism, and structured light beam mask. Our approach offers unmatched versatility, allowing for the experimental fabrication of traditional beam arrays like azimuthal Laguerre–Gaussian (LG), Bessel–Gaussian (BG), and Hermite–Gauss (HG) in the far-field. Notably, it has enabled a method of generating Ince–Gauss (IG) and LG radial mode beam arrays using a convolution solution. Our system provides exceptional control over array periodicity and intensity distribution, bypassing the Talbot self-imaging phenomenon seen in traditional setups. We provide an in-depth theoretical discussion, supported by empirical evidence, of our far-field results. This method has vast potential for applications in optical communication, data processing, and multi-particle manipulation. It paves the way for rapid generation of structured light with high spatial frequencies and complex shapes, promising transformative advances in these domains.
Structured light arrays of various shapes have been a cornerstone in optical science, driven by the complexities of precise and adaptable generation. This study introduces an approach using a spatial light modulator (SLM) as a generator for these arrays. By projecting a holographic mask onto the SLM, it functions simultaneously as an optical convolution device, focusing mechanism, and structured light beam mask. Our approach offers unmatched versatility, allowing for the experimental fabrication of traditional beam arrays like azimuthal Laguerre–Gaussian (LG), Bessel–Gaussian (BG), and Hermite–Gauss (HG) in the far-field. Notably, it has enabled a method of generating Ince–Gauss (IG) and LG radial mode beam arrays using a convolution solution. Our system provides exceptional control over array periodicity and intensity distribution, bypassing the Talbot self-imaging phenomenon seen in traditional setups. We provide an in-depth theoretical discussion, supported by empirical evidence, of our far-field results. This method has vast potential for applications in optical communication, data processing, and multi-particle manipulation. It paves the way for rapid generation of structured light with high spatial frequencies and complex shapes, promising transformative advances in these domains.
Background During the COVID-19 pandemic, the Oxford Precision Psychiatry Lab (OxPPL) developed open-access web-based summaries of mental health care guidelines (OxPPL guidance) in key areas such as digital approaches and telepsychiatry, suicide and self-harm, domestic violence and abuse, perinatal care, and vaccine hesitancy and prioritization in the context of mental illness, to inform timely clinical decision-making. Objective This study aimed to evaluate the practice of creating evidence-based health guidelines during health emergencies using the OxPPL guidance as an example. An international network of clinical sites and colleagues (in Australia, New Zealand, and the United Kingdom) including clinicians, researchers, and experts by experience aimed to (1) evaluate the clinical impact of the OxPPL guidance, as an example of an evidence-based summary of guidelines; (2) review the literature for other evidence-based summaries of COVID-19 guidelines regarding mental health care; and (3) produce a framework for response to future global health emergencies. Methods The impact and clinical utility of the OxPPL guidance were assessed using clinicians’ feedback via an international survey and focus groups. A systematic review (protocol registered on Open Science Framework) identified summaries or syntheses of guidelines for mental health care during and after the COVID-19 pandemic and assessed the accuracy of the methods used in the OxPPL guidance by identifying any resources that the guidance had not included. Results Overall, 80.2% (146/182) of the clinicians agreed or strongly agreed that the OxPPL guidance answered important clinical questions, 73.1% (133/182) stated that the guidance was relevant to their service, 59.3% (108/182) said that the guidelines had or would have a positive impact on their clinical practice, 42.9% (78/182) that they had shared or would share the guidance, and 80.2% (146/182) stated that the methodology could be used during future health crises. The focus groups found that the combination of evidence-based knowledge, clinical viewpoint, and visibility was crucial for clinical implementation. The systematic review identified 2543 records, of which 2 syntheses of guidelines met all the inclusion criteria, but only 1 (the OxPPL guidance) used evidence-based methodology. The review showed that the OxPPL guidance had included the majority of eligible guidelines, but 6 were identified that had not been included. Conclusions The study identified an unmet need for web-based, evidence-based mental health care guidance during the COVID-19 pandemic. The OxPPL guidance was evaluated by clinicians as having a real-world clinical impact. Robust evidence-based methodology and expertise in mental health are necessary, but easy accessibility is also needed, and digital technology can materially help. Further health emergencies are inevitable and now is the ideal time to prepare, including addressing the training needs of clinicians, patients, and carers, especially in areas such as telepsychiatry and digital mental health. For future planning, guidance should be widely disseminated on an international platform, with allocated resources to support adaptive updates.
BACKGROUND Globally, the needs of those with mental health illness were particularly acute during the COVID-19 pandemic, and pre-existing disparities in health care were also highlighted. However, guidelines specifically for mental health were often limited or difficult to find, particularly in the early phases. During the COVID-19 pandemic, the Oxford Precision Psychiatry Lab developed open access online summaries of mental health guidelines (OxPPL guidance) in key areas such as digital approaches and telepsychiatry, suicide and self-harm, domestic violence and abuse, perinatal care, vaccine hesitancy and prioritisation, to inform timely clinical decision-making. The current study aimed to examine the practice of developing evidence-based health guidelines during a health emergency in general and by using the example of the OxPPL guidance in particular. OBJECTIVE An international network of clinical sites and colleagues (in Australia, New Zealand and the UK) including clinicians, researchers and experts by experience aimed to (i) review the literature for evidence-based summaries of COVID-19 guidelines in mental health, (ii) evaluate the clinical impact of the OxPPL guidance, as an example of an evidence-based summary of guidelines, and (iii) produce a framework for response to future global health emergencies. METHODS We carried out a systematic review (protocol registered on OSF: https://osf.io/amsbj/) to identify published summaries/syntheses of guidelines for mental health care which were available during and after the COVID-19 pandemic. The impact and clinical utility of the OxPPL guidance were also assessed using clinicians’ feedback via an international survey and focus groups. RESULTS The systematic review identified 2543 records. Of these, two syntheses of guidelines met all inclusion criteria, but only one (the OxPPL guidance) used evidence-based methodology. In the survey, 81% of clinicians agreed/strongly agreed that the OxPPL guidance answered important clinical questions, 73% that the guidance was relevant to their service, 59% that the guidelines had/would have a positive impact on their clinical practice, 43% that they had shared or would share the guidance, 80% that the methodology could be used in future health crises. The focus groups found that the combination of evidence-based knowledge, clinical viewpoint and visibility was crucial for clinical implementation. CONCLUSIONS The survey, focus groups and systematic review identified a clear unmet need for online evidence-based guidance in mental health during the COVID-19 pandemic. The OxPPL guidance was evaluated by clinicians as having a real-world clinical impact. Robust evidence-based methodology and expertise in mental health are necessary, but easy accessibility is also needed and digital technology can materially help. Further health emergencies are inevitable and now is the ideal time to prepare for the next health crisis, including addressing the training needs of clinicians, patients and carers especially in areas such as telepsychiatry and digital mental health. For future planning, guidance should be widely disseminated on an international platform, with allocated resources to support adaptive updates. CLINICALTRIAL N/A
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