A transmitting integrated module of a laser radar

Abstract

The application discloses a transmitting integrated module of a laser radar, which comprises a chip module, a collimating mirror 1, a collimating mirror 2, an isolator 1, an isolator 2, an isolator 3, a polarization beam splitter, a reflecting / transmitting lens, a reflecting mirror, a coupling mirror 1, a coupling mirror 2, an exit tail fiber, a Faraday rotating mirror and a filter. The application provides a novel integrated laser module, which adopts free space coupling and utilizes light polarization state to realize light path coupling. Since the chip is integrated and packaged, the transmitting module of the laser radar is ensured to be small in size and reliable.

Description

Technical Field

[0001] This invention belongs to the field of optical communication technology, and specifically relates to a laser radar transmission integrated module. Background Technology

[0002] Laser radar (LiDAR) is a radar system that uses laser beams to detect the position, velocity, and other characteristics of targets. Its working principle involves emitting a detection signal (laser beam) towards the target, then comparing the received signal reflected back from the target (target echo) with the emitted signal. After appropriate processing, information about the target can be obtained, such as its distance, azimuth, altitude, velocity, attitude, and even shape. This allows for the detection, tracking, and identification of targets such as aircraft and missiles. The laser transmitter is a crucial component of LiDAR; the laser converts electrical pulses into light pulses and emits them.

[0003] Existing fiber lasers are mostly discrete components. Seed sources are packaged in coaxial or butterfly packages, pump sources in diode or box packages, and other passive components are packaged in metal parts. Although the size of each component is constantly being optimized, it is essentially just a change in size miniaturization. The overall packaged size has a limit. The most important point is that, in pursuit of the smallest package, there is a heat dissipation problem inside the fiber laser module. When the peak output power is in the kilowatt level, heat dissipation affects its long-term reliability.

[0004] Since discrete components are mostly packaged with metal parts, the more optical components used, the better the system performance, but the heavier it is. Currently, in the field of UAV surveying, the items carried by UAVs and their weight are strictly controlled, which affects their flight endurance.

[0005] Temperature characteristics are the most critical factor. Currently, surveying lidar requires a full temperature range of -40℃ to 85℃, while vehicle-mounted lidar requires a full temperature range of -40℃ to 105℃. Current fiber lasers all use fiber optic fusion splices in their internal structure. Ordinary optical fibers are coated with acrylate, and their operating temperature is between -40℃ and 85℃. Long-term operation at excessively high temperatures can affect their long-term reliability. Furthermore, there are too many fiber optic fusion splices, and these splices are mostly protected by heat shrink tubing. Both the temperature resistance of the heat shrink tubing and the potential breakage of the fiber optic splices pose risks. Summary of the Invention

[0006] In view of this, the present invention proposes a laser radar transmission integrated module, comprising: a chip module, a collimating lens 1, a collimating lens 2, an isolator 1, an isolator 2, an isolator 3, a polarization beam splitter, a reflecting / transmitting lens, a reflecting mirror, a coupling mirror 1, a coupling mirror 2, an output pigtail, a Faraday rotator mirror, and a filter.

[0007] The chip module comprises two parts: a seed light chip module and a 9xx chip module.

[0008] The output pigtail includes optical fiber 1, optical fiber 2, and gain optical fiber;

[0009] The light emitted from the seed light chip module is collimated by collimating lens 1. The polarization direction of the collimated light is rotated 45° clockwise by isolator 1 and then rotated 45° clockwise again by isolator 2 before entering the polarization beam splitter. The S-polarized light emitted from the polarization beam splitter is filtered by a filter and then combined with the light emitted from the 9xx chip module, which is collimated by collimating lens 2, through a reflective / transmitting lens to form a combined beam.

[0010] The combined light beam sequentially enters the coupling mirror 1 and the optical fiber 1, and after being amplified for the first time by the gain fiber, it enters the Faraday rotating mirror, which reflects the light in an orthogonal polarization direction of 90°. The reflected light returns along the original path and is amplified for the second time by the gain fiber. The returned light is emitted as P-polarized light by the polarization beam splitter. The P-polarized light is reflected by the mirror, and then passes through the coupling mirror 2 and the isolator 3, and is output through the optical fiber 2.

[0011] Furthermore, the 9xx chip module is any one of a 915nm chip module, a 940nm chip module, or a 975nm chip module.

[0012] Furthermore, the seed light chip module is a 1550nm chip module or a 1064nm chip module.

[0013] Furthermore, the seed light chip module includes: a laser chip, a heat sink, a TEC semiconductor cooling chip, an MPD detector, and a thermistor. The laser chip provides the optical signal source and is placed on the heat sink. The heat sink conducts the heat generated when the laser chip emits light into the TEC. The heat sink is placed on the TEC semiconductor cooling chip, which provides a stable ambient temperature for the laser chip. The thermistor is placed on the heat sink and monitors the temperature of the laser chip in real time and feeds it back to the TEC control circuit. The MPD detector is placed on the back of the laser chip.

[0014] Furthermore, both collimating lens 1 and collimating lens 2 are coated with collimating lens anti-reflection coating.

[0015] Furthermore, the reflective / transmitting lens is a seed light reflective / 9XX transmitting lens, which reflects the light emitted by the seed light chip module and transmits the light emitted by the 9xx chip module.

[0016] Furthermore, the reflective / transmitting lens is a 9XX reflective / seed light transmitting lens, which reflects the light emitted by the 9xx chip module and transmits the light emitted by the seed light chip module.

[0017] Other technical solutions adopted by the present invention to solve its technical problems are: replacing the Faraday rotator with a quarter-wave plate and a reflecting mirror, wherein the optical fiber in the replacement part is a polarization-maintaining fiber.

[0018] Other technical solutions adopted by the present invention to solve its technical problems may also be as follows: A half-wave plate is used to replace the isolator 2. The light emitted from the seed light chip module is collimated by the collimating lens 1. The polarization direction of the collimated light is rotated 45° clockwise by the isolator 1, and then rotated 45° clockwise again by the half-wave plate before entering the polarization beam splitter. The P-polarized light emitted from the polarization beam splitter and the light emitted from the 9xx chip module are collimated by the collimating lens 2 and then reflected by the reflecting mirror. The light is then combined into a beam by the reflecting / transparent lens. The beam is sequentially injected into the coupling mirror 1 and the optical fiber 1, and then amplified for the first time by the gain fiber before entering the Faraday rotation mirror. The light is reflected in a 90° orthogonal polarization direction. The reflected light returns along the original path and is amplified a second time by the gain fiber. The returned light is emitted as S-polarized light by the polarization beam splitter. The S-polarized light passes through the coupling mirror 2 and the isolator 3, passes through the optical fiber 2, and is then output through the filter.

[0019] The beneficial effects of the technical solution provided by this invention are:

[0020] This invention patent provides a novel integrated laser module that uses free space coupling internally and utilizes optical polarization state to achieve optical path coupling. Due to the integrated chip packaging, the laser module is guaranteed in terms of miniaturization and reliability. Attached Figure Description

[0021] Figure 1 This is a structural block diagram of Embodiment 1 of the present invention;

[0022] Figure 2 This is a working diagram of the quarter-wave plate and reflecting mirror that replace the Faraday rotating mirror in an embodiment of the present invention;

[0023] Figure 3 This is a structural block diagram of Embodiment 2 of the present invention;

[0024] Figure 4 This is a structural block diagram of Embodiment 3 of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0026] Embodiment 1 of the present invention, referring to Figure 1A laser radar transmitting integrated module includes: a chip module, collimating lens 1, collimating lens 2, isolator 1, isolator 2, isolator 3, polarization beam splitter (PBS), reflecting / transmitting mirror, reflecting mirror, coupling mirror 1, coupling mirror 2, output pigtail, Faraday rotator (FRM), and filter; wherein the Faraday rotator can be replaced by a quarter-wave plate and reflecting mirror, and the fiber in the replacement part uses polarization-maintaining fiber. (Reference) Figure 2 , Figure 2 This is a working diagram of the quarter-wave plate and the reflecting mirror that replace the Faraday rotating mirror in an embodiment of the present invention.

[0027] The chip module consists of two parts: a seed light chip module and a 9xx chip module (9XX chip); the 9xx chip module is any one of a 915nm chip module, a 940nm chip module, or a 975nm chip module; the seed light chip module is a 1550nm chip module or a 1064nm chip module.

[0028] The seed light chip module consists of a laser chip, a heat sink, a TEC (thermal energy dispersive condenser), an MPD (multiple-detector) detector, and a thermistor. The laser chip provides the seed light signal source and is placed on top of the heat sink. The heat sink's function is to conduct the heat generated when the laser chip emits light into the TEC. The TEC provides a stable ambient temperature for the laser chip. The thermistor, also placed on the heat sink, monitors the laser chip temperature in real time and feeds this information back to the TEC control circuit. The MPD detector is located on the back of the laser chip and monitors its reflectivity in real time.

[0029] The function of collimating lens 1 is to shape the light emitted by the seed light chip module into parallel light for free-space coupling within the system, thereby improving coupling efficiency. The collimating lens is coated with an anti-reflection film, with a transmittance of ≥99%.

[0030] The function of collimating lens 2 is to shape the light emitted by the 9xx chip module into parallel light for free-space coupling within the system, thereby improving coupling efficiency. The collimating lens is coated with an anti-reflection coating, with a transmittance ≥99.5%.

[0031] Isolators 1, 2, and 3 consist of a polarizer, a Faraday rotator, and an analyzer. The polarizer is a 0° linear polarizer, the Faraday rotator has a rotation angle of 45°, and the analyzer is a 45° linear polarizer. The function of the isolators is to isolate the light reflected from the optical path entering the seed laser chip, ensuring the stable operation of the seed laser chip, with an isolation level ≥30dB.

[0032] The function of the PBS polarization beam splitter is to divide the polarization state of the signal light into P polarization and S positive polarization. The extinction ratio of the PBS is ≥2000, that is, Tp:Ts≥2000. The output of the PBS itself is linearly polarized light.

[0033] The reflective and projection lenses use seed light reflection / 9xx light transmission lenses: dielectric film reflectors, for incident angles from 0 to 45°, reflectivity >99% for seed light S-polarized or P-polarized light reflection, and average transmittance >99% for 9xxnm laser.

[0034] The reflector uses a dielectric film reflector with a reflectivity of ≥99.5%.

[0035] The function of coupling mirror 1 is to couple the S-polarized light of the seed signal light and the 9xxnm pump light into the optical fiber.

[0036] Coupler 2 is used to couple the output light into the optical fiber.

[0037] The output pigtail includes fiber 1, fiber 2, and gain fiber. The optical fibers used in the optical path can be ordinary optical fibers or polarization-maintaining fibers.

[0038] The filter is a 200GHz filter.

[0039] The Faraday rotator (FRM) and gain fiber are located outside the integrated module package.

[0040] The optical path is as follows: the light emitted from the seed light chip module is collimated by collimating lens 1, and the polarization direction of the collimated light is rotated 45° clockwise by isolator 1, and then rotated 45° clockwise again by isolator 2 before entering the polarization beam splitter. The S-polarized light emitted from the polarization beam splitter is filtered by a filter and then combined with the light emitted from the 9xx chip module after being collimated by collimating lens 2, and then merged into a combined beam through the seed light reflection / 9xx light transmission lens.

[0041] The combined light beam sequentially enters the coupling mirror 1 and the optical fiber 1, and after being amplified for the first time by the gain fiber, it enters the Faraday rotating mirror, which reflects the light in an orthogonal polarization direction of 90°. The reflected light returns along the original path and is amplified for the second time by the gain fiber. The returned light is emitted as P-polarized light by the polarization beam splitter. The P-polarized light is reflected by the mirror, and then passes through the coupling mirror 2 and the isolator 3, and is output through the optical fiber 2.

[0042] Embodiment 2 of the present invention, refer to Figure 2 A laser radar transmitting integrated module includes: a chip module, collimating lens 1, collimating lens 2, isolator 1, half-wave plate, isolator 3, polarization beam splitter (PBS), reflecting / transmitting lens, reflecting mirror, coupling mirror 1, coupling mirror 2, output pigtail, Faraday rotator (FRM), and filter; wherein the Faraday rotator can be replaced by a quarter-wave plate and reflecting mirror, and the optical fiber of the replacement part uses polarization-maintaining fiber.

[0043] The chip module consists of two parts: a seed light chip module and a 9xx chip module (9XX chip); the 9xx chip module is any one of a 915nm chip module, a 940nm chip module, or a 975nm chip module; the seed light chip module is a 1550nm chip module or a 1064nm chip module.

[0044] The seed light chip module consists of a laser chip, a heat sink, a TEC (thermal energy dispersive condenser), an MPD (multiple-detector) detector, and a thermistor. The laser chip provides the seed light signal source and is placed on top of the heat sink. The heat sink's function is to conduct the heat generated when the laser chip emits light into the TEC. The TEC provides a stable ambient temperature for the laser chip. The thermistor, also placed on the heat sink, monitors the laser chip temperature in real time and feeds this information back to the TEC control circuit. The MPD detector is located on the back of the laser chip and monitors its reflectivity in real time.

[0045] The function of collimating lens 1 is to shape the light emitted by the seed light chip module into parallel light for free-space coupling within the system, thereby improving coupling efficiency. The collimating lens is coated with an anti-reflection film, with a transmittance of ≥99%.

[0046] The function of collimating lens 2 is to shape the light emitted by the 9xx chip module into parallel light for free-space coupling within the system, thereby improving coupling efficiency. The collimating lens is coated with an anti-reflection coating, with a transmittance ≥99.5%.

[0047] Isolators 1 and 3 consist of a polarizer, a Faraday rotator, and an analyzer. The polarizer is a 0° linear polarizer, the Faraday rotator has a rotation angle of 45°, and the analyzer is a 45° linear polarizer. The function of the isolators is to isolate the light reflected from the optical path entering the seed laser chip, ensuring the stable operation of the seed laser chip, with an isolation level ≥30dB.

[0048] The function of the PBS polarization beam splitter is to divide the polarization state of the signal light into P polarization and S positive polarization. The extinction ratio of the PBS is ≥2000, that is, Tp:Ts≥2000. The output of the PBS itself is linearly polarized light.

[0049] The reflecting and projecting lenses use 9xx light reflecting / seed light transmission lenses: dielectric film reflectors, with a reflectivity of >99% for 9xxnm laser reflection at incident angles from 0 to 45°, and an average transmittance of >99% for seed light S-polarized or P-polarized light.

[0050] The reflector uses a dielectric film reflector with a reflectivity of ≥99.5%.

[0051] The function of coupling mirror 1 is to couple the S-polarized light of the seed signal light and the 9xxnm pump light into the optical fiber.

[0052] Coupler 2 is used to couple the output light into the optical fiber.

[0053] The output pigtail includes fiber 1, fiber 2, and gain fiber. The optical fibers used in the optical path can be ordinary optical fibers or polarization-maintaining fibers.

[0054] The filter is a 200GHz filter.

[0055] The Faraday rotator (FRM), 200GHz filter, and gain fiber are located outside the integrated module package.

[0056] The optical path is as follows: The light emitted from the seed light chip module is collimated by collimating lens 1. The polarization direction of the collimated light is rotated 45° clockwise by isolator 1, and then rotated 45° clockwise again by a half-wave plate before entering the polarization beam splitter. The P-polarized light emitted from the polarization beam splitter and the light emitted from the 9xx chip module are collimated by collimating lens 2 and then reflected by a mirror. The two are combined into a beam by a 9xx light reflection / seed light transmission lens. The combined beam enters coupling lens 1 and fiber 1 in sequence, and after being amplified for the first time by the gain fiber, it enters the Faraday rotation mirror, which reflects the light in a 90° orthogonal polarization direction. The reflected light returns along the original path and is amplified a second time by the gain fiber. The returned light is emitted as S-polarized light by the polarization beam splitter. The S-polarized light passes through coupling lens 2 and isolator 3, passes through fiber 2, and is output through a filter.

[0057] Embodiment 3 of the present invention, with reference to Figure 3 A laser radar transmitting integrated module includes: a chip module, collimating lens 1, collimating lens 2, isolator 1, half-wave plate, isolator 3, polarization beam splitter (PBS), reflecting / transmitting lens, reflecting mirror, coupling mirror 1, coupling mirror 2, output pigtail, Faraday rotator (FRM), and filter; wherein the Faraday rotator can be replaced by a quarter-wave plate and reflecting mirror, and the optical fiber of the replacement part uses polarization-maintaining fiber.

[0058] The chip module consists of two parts: a seed light chip module and a 9xx chip module (9XX chip); the 9xx chip module is any one of a 915nm chip module, a 940nm chip module, or a 975nm chip module; the seed light chip module is a 1550nm chip module or a 1064nm chip module.

[0059] The seed light chip module consists of a laser chip, a heat sink, a TEC (thermal energy dispersive condenser), an MPD (multiple-detector) detector, and a thermistor. The laser chip provides the seed light signal source and is placed on top of the heat sink. The heat sink's function is to conduct the heat generated when the laser chip emits light into the TEC. The TEC provides a stable ambient temperature for the laser chip. The thermistor, also placed on the heat sink, monitors the laser chip temperature in real time and feeds this information back to the TEC control circuit. The MPD detector is located on the back of the laser chip and monitors its reflectivity in real time.

[0060] The function of collimating lens 1 is to shape the light emitted by the seed light chip module into parallel light for free-space coupling within the system, thereby improving coupling efficiency. The collimating lens is coated with an anti-reflection film, with a transmittance of ≥99%.

[0061] The function of collimating lens 2 is to shape the light emitted by the 9xx chip module into parallel light for free-space coupling within the system, thereby improving coupling efficiency. The collimating lens is coated with an anti-reflection coating, with a transmittance ≥99.5%.

[0062] Isolators 1 and 3 consist of a polarizer, a Faraday rotator, and an analyzer. The polarizer is a 0° linear polarizer, the Faraday rotator has a rotation angle of 45°, and the analyzer is a 45° linear polarizer. The function of the isolators is to isolate the light reflected from the optical path entering the seed laser chip, ensuring the stable operation of the seed laser chip, with an isolation level ≥30dB.

[0063] The function of the PBS polarization beam splitter is to divide the polarization state of the signal light into P polarization and S positive polarization. The extinction ratio of the PBS is ≥2000, that is, Tp:Ts≥2000. The output of the PBS itself is linearly polarized light.

[0064] The reflective and projection lenses use seed light reflection / 9xx light transmission lenses: dielectric film reflectors, for incident angles from 0 to 45°, reflectivity >99% for seed light S-polarized or P-polarized light reflection, and average transmittance >99% for 9xxnm laser.

[0065] The reflector uses a dielectric film reflector with a reflectivity of ≥99.5%.

[0066] The function of coupling mirror 1 is to couple the S-polarized light of the seed signal light and the 9xxnm pump light into the optical fiber.

[0067] Coupler 2 is used to couple the output light into the optical fiber.

[0068] The output pigtail includes fiber 1, fiber 2, and gain fiber. The optical fibers used in the optical path can be ordinary optical fibers or polarization-maintaining fibers.

[0069] The filter is a 200GHz filter.

[0070] The Faraday rotator (FRM), 200GHz filter, and gain fiber are located outside the integrated module package.

[0071] The optical path is as follows: The light emitted from the seed light chip module is collimated by collimating lens 1. The polarization direction of the collimated light is rotated 45° clockwise by isolator 1, and then rotated 45° clockwise again by a half-wave plate before entering the polarization beam splitter. The P-polarized light emitted from the polarization beam splitter is reflected by a mirror and then collimated by collimating lens 2 with the light emitted from the 9xx chip module. The two are combined into a beam by the seed light reflection / 9xx light transmission lens. The combined beam is then sequentially injected into coupling lens 1 and fiber 1, and then amplified for the first time by the gain fiber before entering the Faraday rotation mirror, which reflects the light in a 90° orthogonal polarization direction. The reflected light returns along the original path and is amplified a second time by the gain fiber. The returned light is then emitted as S-polarized light by the polarization beam splitter. The S-polarized light passes through coupling lens 2 and isolator 3, then through fiber 2, and finally output through a 200GHz filter.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser radar transmitting integrated module, characterized in that, include: Chip module, collimating lens 1, collimating lens 2, isolator 1, isolator 2, isolator 3, polarization beam splitter, reflecting / transmitting lens, reflecting mirror, coupler 1, coupler 2, output pigtail, Faraday rotator, filter; The chip module comprises two parts: a seed light chip module and a chip module of any one of 915nm, 940nm, or 975nm. The output pigtail includes optical fiber 1, optical fiber 2, and gain optical fiber; The light emitted from the seed light chip module is collimated by collimating lens 1. The polarization direction of the collimated light is rotated 45° clockwise by isolator 1 and then rotated 45° clockwise again by isolator 2 before entering the polarization beam splitter. The S-polarized light emitted from the polarization beam splitter is filtered by a filter and then combined with the light emitted from any of the 915nm, 940nm, or 975nm chip modules after being collimated by collimating lens 2, and then combined into a single beam through a reflective / transmitting lens. The combined light beam sequentially enters the coupling mirror 1 and the optical fiber 1, and after being amplified for the first time by the gain fiber, it enters the Faraday rotating mirror, which reflects the light in an orthogonal polarization direction of 90°. The reflected light returns along the original path and is amplified for the second time by the gain fiber. The returned light is emitted as P-polarized light by the polarization beam splitter. The P-polarized light is reflected by the mirror, and then passes through the coupling mirror 2 and the isolator 3, and is output through the optical fiber 2.

2. A laser radar transmitting integrated module, characterized in that, include: Chip module, collimating lens 1, collimating lens 2, isolator 1, half wave plate, isolator 3, polarization beam splitter, reflecting / transmitting lens, reflecting mirror, coupler 1, coupler 2, output pigtail, Faraday rotator, filter; The chip module comprises two parts: a seed light chip module and a chip module of any one of 915nm, 940nm, or 975nm. The output pigtail includes optical fiber 1, optical fiber 2, and gain optical fiber; The light emitted from the seed light chip module is collimated by collimating lens 1. The polarization direction of the collimated light is rotated 45° clockwise by isolator 1, and then rotated 45° clockwise again by 1 / 2 wave plate before entering the polarization beam splitter. The P-polarized light emitted from the polarization beam splitter and the light emitted from any of the 915nm, 940nm, or 975nm chip modules are collimated by collimating lens 2 and then reflected by a mirror before being combined into a single beam through a reflecting / transparent lens. The combined beam is sequentially incident on coupling mirror 1 and fiber 1, then amplified for the first time by gain fiber and incident on Faraday rotating mirror, which reflects the light in a 90° orthogonal polarization direction. The reflected light returns along the original path and is amplified for the second time by gain fiber. The returned light is then emitted as S-reverse polarized light by polarization beam splitter. The S-reverse polarized light passes through coupling mirror 2 and isolator 3, through fiber 2, and is then output through filter.

3. The laser radar transmission integration module according to claim 1 or 2, characterized in that, The Faraday rotator is replaced with a quarter-wave plate and a mirror, with polarization-maintaining fiber used in the replacement portion.

4. The laser radar transmission integration module according to claim 1 or 2, characterized in that, The seed light chip module includes: a laser chip, a heat sink, a TEC (thermal energy dispersive condenser), an MPD (multiple-displacement detector), and a thermistor. The laser chip provides the optical signal source and is placed on the heat sink. The heat sink conducts the heat generated when the laser chip emits light into the TEC. The heat sink is placed on the TEC and provides a stable ambient temperature for the laser chip. The thermistor is placed on the heat sink and monitors the temperature of the laser chip in real time and feeds it back to the TEC control circuit. The MPD detector is placed on the back of the laser chip.

5. A laser radar transmission integration module according to claim 1 or 2, characterized in that, Both collimating lens 1 and collimating lens 2 are coated with collimating lens anti-reflection coating.

6. A laser radar transmitting integrated module according to claim 1 or 2, characterized in that, The seed light chip module is a 1550nm chip module or a 1064nm chip module.

7. The laser radar transmitting integrated module according to claim 1, characterized in that, The reflective / transmitting lens is a seed light reflective / transmitting lens of 915nm, 940nm, or 975nm, which reflects the light emitted by the seed light chip module and transmits the light emitted by the chip module of 915nm, 940nm, or 975nm.

8. The laser radar transmitting integrated module according to claim 2, characterized in that, The reflective / transmitting lens is any one of the reflective / seed light transmission lenses of 915nm, 940nm, or 975nm, reflecting the light emitted by any one of the chip modules of 915nm, 940nm, or 975nm, and transmitting the light emitted by the seed light chip module.

Images