35results about How to "Increase light intensity" patented technology

The application discloses a fabric for enhancing photocatalysis aldehyde removal based on light refraction principle, in particular to a twill double-layer fabric, which comprises a group of warp yarns and two groups of weft yarns, the two groups of weft yarns are all interwoven with the warp yarns, and the two groups of weft yarns are photocatalysis yarns and silver-plated polyester flat filaments respectively, the photocatalysis yarns are located on the surface layer of the warp yarns, the silver-plated polyester flat filaments are located on the inner layer of the warp yarns, and the photocatalysis yarns are prepared through the processes of cleaning, mixing, carding, drawing, roving and spinning of photocatalysis fibers with a triangular prism cross-section structure. The application relates to the functional textile technology field, and particularly provides the fabric for enhancing photocatalysis aldehyde removal based on light refraction principle, which can clean the inner wall of the kettle body synchronously in the reaction process, ensures that raw materials can all participate in the reaction, avoids the subsequent reaction in the kettle body, and can assist the smooth discharge of products.

The utility model discloses a kind of ultraviolet light curing devices, including shell, curing chamber is equipped in the shell, and curing chamber bottom is equipped with the load plate of load and drive workpiece to rotate uniform light, and load plate electrically connected with the driving motor installed in shell, curing chamber is installed with partition cover, and partition cover is sleeved in load plate outside.This ultraviolet light curing device, first, the rotation design of device through load plate, workpiece can be received ultraviolet light in curing process all-round evenly, ensure the consistency of curing quality, avoid the curing defect caused by uneven illumination, to improve curing efficiency and product quality;In addition, the optimization layout of UV light mechanism and the setting of reflector, further improve the illumination intensity and uniformity, shorten curing time, improve production efficiency.

This invention discloses a plant cultivation system, belonging to the technical field of plant cultivation systems. The system includes a cultivation chamber, double-sided supplemental lighting fixtures, multiple cultivation units, and a ventilation system. By centrally arranging double-sided supplemental lighting fixtures within a closed chamber, and layering multiple nutrient return components and multiple inclined cultivation pots on mounting frames on both sides of the fixtures, with the cultivation chambers of the pots inclined towards the supplemental lighting fixtures, and a ventilation system at the top of the chamber, all planting surfaces can receive uniform light and ventilation. Simultaneously, the ventilation system dissipates heat from the lighting fixtures, eliminating the need for additional cooling devices and resulting in lower energy consumption. Compared to traditional flat-layer cultivation, this solution offers higher space utilization efficiency, more efficient use of light resources, complete recycling of nutrient solution, and more uniform overall crop light exposure. Annual yield for the same planting area is significantly higher than traditional methods, while requiring less manpower and lower costs for daily maintenance, making it suitable for large-scale, high-efficiency cultivation.

The present disclosure is a flash module and an electronic device, and relates to the technical field of electronic devices. The flash module comprises a support, a circuit board, a light-emitting assembly and a heat dissipation assembly; the circuit board is connected with the support; the light-emitting assembly has a first light-emitting module, the first light-emitting module comprises a first light-emitting element and a first lens, the first light-emitting element is electrically connected with the circuit board, and the first lens is opposite to the light-emitting light path of the first light-emitting element; the heat dissipation assembly comprises a first heat dissipation element and a second heat dissipation element, the first heat dissipation element is located on the side of the support away from the circuit board and is connected with the support, the second heat dissipation element is located on the side of the first heat dissipation element away from the support and is connected with the first heat dissipation element, and at least one of the first heat dissipation element and the second heat dissipation element is a metal heat dissipation element. In the present disclosure, the heat dissipation capacity of the heat dissipation assembly is improved, so that the flash module can further improve the illumination intensity.

The utility model relates to tunnel detection technical field discloses an image acquisition device, include: first casing, second casing, camera assembly and light emission device, camera assembly sets up in first casing, light emission device sets up in second casing, camera assembly with light emission device passes through the cable connection, the utility model discloses through setting up camera assembly in first casing, setting up light emission device in second casing, has realized the independent setting of light emission device and camera assembly, avoided the influence that the heat dissipation of light emission device to camera assembly, makes light emission device can adopt high -power, improved the light intensity of light emission device and the image quality of acquisition.

This utility model discloses an AI recognition station, including a sorting station. The upper surface of the sorting station has an axially oriented groove, the top of which is covered by a transparent, transparent support plate for placing goods. One side of the support plate has an output port connected to a conveyor line for transporting goods. A camera is installed at the center of the bottom of the groove. Multiple annular light sources are arranged circumferentially on the inner wall of the groove, and these annular light sources are evenly spaced along the longitudinal direction of the groove. This sorting station, by designing a groove and installing the camera at the center of the bottom of the groove, captures the bottom surface of goods placed on the support plate from the bottom. Multiple evenly spaced, longitudinally distributed annular light sources are arranged on the inner wall of the groove. Each annular light source can be individually switched on and off. By controlling the number of annular light sources on, the clarity of the goods image can be improved by adjusting the ambient light intensity. The resistance to environmental interference is significantly improved.

The lamp comprises a shell, a first lighting assembly and a second lighting assembly, the first lighting assembly and the second lighting assembly are arranged in the shell, the first lighting assembly comprises a first light guide part and a first light source module surrounding the first light guide part, and the first light guide part comprises a light inlet face facing the first light source module and a first light outlet face adjacent to the light inlet face; the first light guide part is configured to receive first light rays emitted by the first light source module through the light incident surface and guide the first light rays in a first direction through the first light emergent surface; the second lighting assembly extends at least beyond the first lighting assembly in the direction away from the mounting base and comprises a second light source module and a light emitting part arranged opposite to the second light source module, and the light emitting part is configured to receive second light emitted by the second light source module and emit at least part of the second light in the second direction intersecting with the first direction. Compared with the prior art, the whole lamp is simple, light and thin, and glare can be effectively avoided.

The utility model provides a pair of luminous glasses capable of generating power through solar energy, which relates to the technical field of intelligent wearing and comprises a glasses body, a PCB (Printed Circuit Board), an LED (Light Emitting Diode) lamp, a battery and a solar panel, the problem that in the prior art, light sources are insufficient for people wearing glasses in the dark is solved. The solar cell panel fixedly arranged in the middle of the mirror frame is used for generating electricity, so that frequent charging requirements are avoided, and the glasses are more environment-friendly and convenient; a plurality of batteries are arranged, energy storage is efficient, and light intensity is high; the LED lamp switch is used for controlling on and off of the light source, so that the LED lamp can be used in the daytime and at night; the light intensity can be adjusted through the luminosity adjusting device so as to adapt to different environments, the individual requirements are met, and a more suitable eye using environment is provided; the light-sensitive color-changeable lens is adopted, can become a colored lens for protection when encountering strong light irradiation, and is suitable for being used indoors and outdoors at the same time.

The utility model discloses a kind of strawberry multilayer planting frame, including the frame body of square tube vertical and horizontal assembly, the both ends of the frame body are equipped with vertical support column, multiple layers of shelves are sequentially equipped from top to bottom between the support column of both ends, multiple planting grooves are transversely arranged on each layer shelf;The both sides of each layer shelf are respectively equipped with fruit supporting net, the fruit supporting net is arranged on the both sides of planting groove;Multiple supports are arranged along the length direction of layer shelf, the support includes the extension of stretching to both sides, the fruit supporting net is fixed in the lower side of the extension, so that fruit supporting net protrudes to both sides thereof. The utility model can make moisture and nutrition to strawberry fruit smoothly, ensure the smooth growth of strawberry fruit;It can also prevent light leakage, improve light intensity, on the other hand, strawberry plant can be evenly illuminated, so as to ensure that plant growth is uniform.

The invention discloses an imaging device and a vehicle, the device comprises an optical waveguide, an image acquisition module and an image output module, and the image acquisition module is in communication connection with the image output module; the optical waveguide is used for splitting incident light to obtain a first light beam and a second light beam, transmitting the first light beam to a target position and transmitting the second light beam to the image acquisition module, the first light beam being visible light, and the second light beam being invisible light; the image acquisition module is used for imaging and processing the second light beam to obtain a target image; and the image output module is used for projecting the target image to the optical waveguide, and the optical waveguide transmits the target image to the target position. In this way, the imaging effect can be improved.

The application relates to the technical field of display, in particular to a light guide plate and a backlight module, which comprise a plate body and light emitting strips, the plate body comprises a light emitting surface, a plurality of the light emitting strips are arranged in parallel on the light emitting surface, the light emitting strip is a groove recessed on the light emitting surface, and the size of the light emitting strip close to the edge area of the light emitting surface is larger than that of the light emitting strip close to the central area of the light emitting surface. The application has the effect of eliminating the waist shadow on the premise of ensuring the brightness of the central area.

This utility model relates to the field of fire-fighting light technology, specifically a lens structure for fire-fighting lights, including a circuit board and a lens. The circuit board has at least one light source, and the lens has a protrusion corresponding to the light source. The protrusion protrudes outwards in a direction away from the light source, and has an inwardly concave arc surface on the side closest to the light source. The center of the protrusion and the light source are located on the same vertical plane, and the height of the center of the protrusion is lower than the height of the light source. Furthermore, the distance between the left and right sides of the protrusion is greater than the distance between the top and bottom sides. Therefore, by making the height of the center of the protrusion lower than the height of the light source, this utility model causes most of the light from the light source to be angled downwards after passing through the lens. This increases the light intensity detected by the ground metering point and reduces the detected vertical angle. Simultaneously, the distance between the left and right sides of the protrusion is greater than the distance between the top and bottom sides, further satisfying the angle requirements.

The utility model relates to electric motor car lamp technical field discloses a telescopic electric motor car lamp support structure of adjustment, including car lamp main part, the car lamp main part bottom is provided with base, the car lamp main part bottom is provided with quick -detach assembly, the base top is fixedly connected with support, the support inner wall is provided with adjusting assembly, the adjusting assembly includes sliding rod, the sliding rod outer wall sliding connection in the support inner wall, the sliding rod inside is provided with the clamping groove, the sliding rod bottom fixedly connected with the limit board, the limit board outer wall sliding connection in the support inner wall, the support outer wall fixedly connected with fixed block, in the utility model, through the sliding rod in the support inner wall sliding, then through the clamping block removal to the clamping groove inside, avoid different road conditions and the different demand of riding scene to car lamp illumination height, thereby according to actual situation flexible adjustment car lamp height, satisfy a variety of illumination demand, improve car lamp applicability.

The utility model relates to an electronic drum disc, which comprises a drum surface, a light guide ring and a base, the periphery of the base is provided with an annular groove with an upward opening, a light-emitting component is arranged in the annular groove, a light blocking ring is arranged on the inner side of a notch of the annular groove, the light guide ring is integrally formed by a side aperture and an upper aperture, and the side aperture is sleeved outside the annular groove. The upper aperture abuts against the upper edge of the light blocking ring. A vibration sensor and a circuit board are installed in the light blocking ring, the circuit board is connected with the vibration sensor and the light-emitting assembly, the drumhead is stacked on the upper side of the light guiding ring, and the vibration sensor abuts against the drumhead. The base is provided with the light blocking ring, the light guide ring is integrally formed by the side light ring and the upper light ring, the side light ring sleeves the outer side of the annular groove, and the upper light ring abuts against the upper edge of the light blocking ring, so that all light of the light-emitting assembly is refracted by the side light ring and the upper light ring, and the light emitted by the outer wall of the light guide ring is high in intensity, high in light utilization rate and more energy-saving in use.

The utility model belongs to the technical field of detection equipment, and particularly provides AVI visual detection equipment which comprises a case workbench, a detection module, a feeding front module and a discharging back module are integrated on the case workbench, the feeding front module and the discharging back module are arranged on the two sides of the detection module respectively, and the detection module comprises a door-shaped frame and a photographing module. The photographing module is installed on the top of the door-shaped frame, the feeding front face module and the discharging back face module each comprise a mechanical arm, a connecting base and a flexible jig, the mechanical arms are fixedly installed on the machine box workbench, the connecting bases are connected with the telescopic ends of the mechanical arms, and the multiple flexible jigs are installed on the connecting bases at intervals. Automatic positioning, detecting and discharging of materials can be achieved, manual intervention is reduced, meanwhile, all the modules are mutually independent, maintenance and upgrading are convenient, in addition, the angle of the materials can be adjusted through movement of the two mechanical arms, missing detection is avoided, the detection efficiency and the detection precision are improved, and meanwhile the feeding and discharging functions can be taken into consideration.

The utility model belongs to the technical field of coal mine lighting, and particularly relates to a straight type LED support lamp convenient to assemble. Comprising an explosion-proof shell and a radiator, and the left end and the right end of the radiator are fixed to a bottom shell and the explosion-proof shell respectively; the included angle between the back faces of the two LED light source plates is 120 degrees, and the two LED light source plates are arranged The driving power supply provides electric energy for the bracket lamp; the end cover is located on the outer side of the wire holder and plays a protection role; the transparent part is arranged on the periphery of the radiator in a sleeving manner; and the protective net is positioned on the periphery of the transparent part. According to the frame lamp, the modular design concept is adopted, and all components are designed into independent modules; according to the novel straight LED support lamp mechanism, the production efficiency is remarkably improved, the production cost is reduced, meanwhile, the installation and maintenance process is simpler, more convenient and faster, it is ensured that stable and high-quality illumination experience can be provided for a user under the special environment of a coal mining working face of a coal mine, and smooth development of coal mining work is guaranteed to the maximum extent.

The utility model discloses a kind of self-adaptive creeper frames for honeysuckle planting, including support frame and rotating stand;Support frame quantity is two and is installed in the frame body of two sides of honeysuckle before and after respectively, and the bottom of support frame is fixed in soil layer;Rotating stand quantity is two and is V-shaped distribution between two support frames on two sides, and every rotating stand is square net rack structure and its two sides before and after are respectively rotated and installed on two support frames by pivot;Position corresponding to below every rotating stand between two support frames is fixed with a connecting rod respectively, and the lower end of every rotating stand is connected with multiple elastic members between its corresponding connecting rod.The utility model is by V-shaped layout cooperation dynamic opening and closing, and middle lower part blade light intensity is greatly promoted, and photosynthetic efficiency is doubled, and flower bud differentiation is significantly promoted.Rotating stand dynamic development avoids branch stacking, and potential flower bud visibility is improved, and mispruning rate is reduced.Opening angle increases to strengthen crown layer air circulation, and humidity reduces, and powdery mildew and aphid occurrence rate is greatly reduced.

The utility model discloses a kind of net frame gluing quick curing device, belong to PCB manufacturing technical field;It includes: curing assembly and exhaust component, curing assembly includes annular lampshade, ultraviolet lamp and lifting unit, ultraviolet lamp is installed at the bottom of annular lampshade, annular lampshade can gather the ultraviolet light from ultraviolet lamp on the photosensitive glue of PCB;The top of annular lampshade is connected with ceiling by lifting unit, lifting unit can change the distance between annular lampshade and PCB;Exhaust component includes the exhaust unit and suction pipe communicated with annular lampshade, suction pipe is communicated with exhaust unit, to supply suction photosensitive glue generated harmful gas.The utility model can accelerate the solidification of photosensitive glue, improve production efficiency.

The invention belongs to the technical field of trap lamps, and particularly relates to a trap lamp convenient to collect insects and a using method, the trap lamp comprises a trap lamp body, a supporting rod, an adjusting rod and a photovoltaic panel, the trap lamp body is installed on one side wall of the adjusting rod, the photovoltaic panel is installed at the top end of the adjusting rod, the adjusting rod is connected to the top end of the supporting rod, and the supporting rod is connected to the top end of the adjusting rod. The supporting rod is vertically installed on the ground, an arc-shaped light reflecting plate is arranged in the trap lamp body and located at the top end in the trap lamp body, the top end of the trap lamp body is connected with a screw, and the screw penetrates through the trap lamp body to be fixedly connected with the arc-shaped light reflecting plate. According to the insect trapping lamp, the arc-shaped light reflecting plate is stably installed in the insect trapping lamp body through cooperation between the arc-shaped light reflecting plate and the screws, then the illuminance is increased and the illumination distance is increased when the insect trapping lamp body works, and therefore the use cost is reduced, and the insect collecting efficiency is improved.

The invention discloses an enhanced Micro LED (Light Emitting Diode) display chip and a preparation method thereof. The enhanced Micro LED display chip comprises a first substrate, an LED epitaxial layer and at least one photonic crystal microstructure layer, the first substrate, the LED epitaxial layer and the at least one photonic crystal microstructure layer are stacked in the thickness direction, the photonic crystal microstructure layer comprises a plurality of photonic crystal microstructure units, and each photonic crystal microstructure unit comprises periodically arranged micro-nano structures. A Mie scattering microstructure formed by Mie ball scattering particles is further arranged in the micro-nano structure, and the Mie scattering microstructure and the micro-nano structure form a local resonance structure, so that light emitted by the Micro LED unit is locally enhanced. A local resonance structure can be formed by introducing Mie ball scattering particles into the micro-nano structure, and a photonic band gap can be formed by overlapping the Mie ball scattering particles with the photonic crystal microstructure layer to form a dual enhancement mechanism, so that light emitted by the Micro LED unit is locally enhanced, angle divergence of emergent light can be inhibited, and light emitting efficiency and intensity are improved.

The utility model discloses a surgical nursing disinfection device, including the lamp stand, the lamp stand is equipped with the lamp stand and the connecting head, the both ends of lamp stand are all connected with connecting head, be equipped with the insertion cavity in connecting head, disinfection lamp subassembly, including two disinfection lamp groups and a plurality of guide board, two disinfection lamp group insertion respectively inserts into the insertion cavity of two connecting heads, the top of each disinfection lamp group all is equipped with a plurality of guide board, a plurality of guide board interval distribution in the length direction of disinfection lamp group, and guide board extends in the width direction of disinfection lamp group. The utility model discloses a surgical nursing disinfection device, it can install the lamp stand through the lamp stand, and the connecting head of lamp stand connects disinfection lamp group in the mode of insertion, with the guide board of disinfection lamp group top guiding guide light and exporting along the width direction, improve the irradiation surface of disinfection lamp group.

The utility model discloses a high-resolution LCD display screen assembly, and relates to the technical field of LCD display screens. A high-resolution LCD display screen assembly comprises a display shell, a light-emitting assembly is arranged at the bottom end in the display shell, a display assembly is arranged at the right end of the light-emitting assembly, and a protection assembly is arranged on the right side of the display assembly. The display shell is fixedly connected with the light-emitting assembly, the light-emitting assembly is fixedly connected with the display assembly, and the display assembly is fixedly connected with the protection assembly. According to the utility model, the light intensity of the light-emitting part is enhanced through the light guide plate and the intensifying plate, so that the light which finally passes through the liquid crystal glass plate is still kept bright, the display brightness of the LCD display screen is improved, the precision of the color light-transmitting sheet is improved, and the external reflected light is weakened through the light-transmitting optical adhesive layer, so that the chromatic aberration caused by the external reflected light is avoided; therefore, the resolution of the LCD display screen is improved.

This invention discloses an indoor oxygen-enhancing ecological wall based on plant chemosynthesis, comprising a wall body with a fixed support frame installed on it. An aquatic animal breeding pond is located at the bottom of the fixed support frame. Above the aquatic animal breeding pond are multiple layers of planting frames for growing greenery. Water pipes are connected between adjacent planting frames. The planting frames and water pipes are arranged in an S-shaped structure. A water replenishment device is located between the top planting frames and the aquatic animal breeding pond, and this device is connected to a controller. A water return device is located between the bottom planting frames and the aquatic animal breeding pond. A supplemental lighting device is installed on the fixed support frame and connected to the controller. This device provides supplemental lighting to the greenery. This invention increases light intensity for the plants through the supplemental lighting device, thereby increasing photosynthesis and promoting normal plant growth and development, while also improving indoor air quality.

The utility model discloses a glass detection table, which belongs to the technical field of glass detection and comprises a base, a light source and a bearing seat. A detection space with an open top is defined in the base, a lamp groove is formed in at least one inner side wall of the base, and the light source is arranged in the lamp groove; and the bearing seat is fixed on the inner side wall of the base and is used for positioning the raw glass sheet, so that light emitted by the light source can irradiate into the raw glass sheet from the side wall of the raw glass sheet. The utility model has the advantage that flaws such as dust, bubbles and the like in the raw glass sheet can be clearly displayed.

The utility model provides a real-time feedback inspection camera, which relates to the field of inspection cameras and comprises a camera body, a sliding seat is arranged on the upper side of the camera body and mounted on a track, a mounting frame is arranged on the outer side of the camera body, the upper end of the mounting frame is connected with a fixed seat, the upper end of the fixed seat is connected with a driving box, and the upper end of the driving box is connected with a driving motor. And meanwhile, the driving box is installed at the lower end of the sliding seat, a storage cavity is formed in the driving box, a double-shaft motor is arranged in the storage cavity, the two ends of the double-shaft motor are connected with lead screws, the outer sides of the lead screws are in threaded connection with moving plates, the lower ends of the moving plates are connected with light shielding plates, and the light shielding plates slidably penetrate through the box walls of the two sides of the driving box. An inner cavity is formed in the shading plate, a circuit board is arranged in the inner cavity, and LED lamp beads are connected to the lower end of the circuit board. The LED lamp has the effect of being suitable for being used in a strong light direct irradiation environment or a low-illumination environment, the use environment range is widened, and a certain protection effect is achieved.

The utility model relates to a portable handheld physiotherapy lamp which comprises a shell, a power supply, a light-emitting component and a light reflecting component, wherein the power supply, the light-emitting component and the light reflecting component are sequentially mounted in the shell; the portable handheld physiotherapy lamp further comprises a control assembly arranged on one side of the power source. The light-emitting assembly comprises a lamp panel used for supporting and fixing and lamp beads installed on the lamp panel. The light reflecting assembly comprises a light reflecting plate and a light reflecting piece arranged on the light reflecting plate, and the lamp beads are arranged towards one side of the light reflecting piece; the lamp bead is arranged opposite to the reflection cup; the lamp bead comprises a plurality of first light emitting sources emitting light with the wavelength ranging from 630 nm to 660 nm and a plurality of second light emitting sources emitting light with the wavelength ranging from 810 nm to 940 nm. The lamp bead is opposite to the reflection cup, and the reflection assembly can effectively collect and reflect light emitted by the lamp bead, so that the light is focused on a treatment part; more light energy can be concentrated in a region needing physical therapy, such as a muscle strain part or an arthralgia part, and the illumination intensity is enhanced, so that the physical therapy effect is improved.

This invention relates to a space-distributed concentrated solar energy system, comprising: a power generation unit, an energy storage unit, a power management unit, and a space-based intelligent solar tracking mechanism. The power generation unit converts solar energy into electrical energy using concentrated solar power technology; the energy storage unit stores the electrical energy; the power generation unit is connected to the power management unit; the power management unit is connected to the energy storage unit and manages the electrical energy output by the power generation unit for collaborative storage in the energy storage unit; the power management unit is also connected to the space-based intelligent solar tracking mechanism and an external load system for power supply; wherein, the power generation unit includes: multiple sets of power generation modules and a support structure; the multiple sets of power generation modules are mounted on the support structure and connected to the power management unit. The energy system provided by this invention can improve the photoelectric conversion efficiency of solar cells and reduce equipment costs.

The utility model relates to medicinal plant seedling raising equipment technical field discloses a kind of drip irrigation type aconitum neriifolium seedling raising device, including outer frame assembly, transfusion subassembly and drip irrigation subassembly.Transfusion subassembly is transported nutrient solution by water pump and pipeline, the rotating ring of drip irrigation subassembly can adjust drip irrigation angle, the vortex fan and cleaning plate of drop opening subassembly can prevent blockage, and the light supplementing lamp of outer frame assembly provides illumination.The device can accurately drip irrigation and adapt aconitum neriifolium growth, improve seedling raising effect, adapt the root system range of different growth stages of aconitum neriifolium seedling, compared with traditional fixed drip irrigation water saving, nutrient solution utilization rate is improved, with the automatic cleaning of inner wall impurity change flow, compared with existing device, reduce the blockage rate, reduce artificial cleaning working hours.

This invention relates to the field of semiconductor laser technology, and more particularly to a vertical-cavity surface-emitting laser (VCSEL). The VCSEL comprises: a negative electrode layer, a substrate, a bottom DBR layer, a first N-type confinement layer, an active region layer, a P-type confinement layer, and a second N-type confinement layer, stacked sequentially. The second N-type confinement layer includes a heavily doped portion, a lightly doped portion, and an insulating portion. The heavily doped portion includes a main tunnel junction and a secondary tunnel junction spaced apart on the surface of the P-type confinement layer. A top DBR layer is located in the central region and includes a first portion and a second portion. A first positive electrode is located in a first edge region. A second positive electrode is located in a second edge region, and a portion is located on the top surface of the second portion. This invention facilitates a stronger PPR effect, thereby effectively improving the -3dB bandwidth of the VCSEL.