Fluorescent ceramic light converter luminous flux measuring system

Abstract

The utility model discloses a luminous flux measuring system for a fluorescent ceramic light converter. Comprising a laser device, a light conversion device and a measuring device. The measuring device is provided with an integrating sphere. The laser device is provided with an excitation light source, an energy transmitting optical fiber, a shaping lens and an optical filter. The excitation light source is arranged outside the integrating sphere, the shaping lens and the optical filter are arranged inside the integrating sphere, and the energy transmission optical fiber penetrates through a through hole of the integrating sphere from the excitation light source and enters the integrating sphere. The light conversion device has a fluorescent ceramic. The beneficial effects of the utility model lie in that the arrangement of the energy transmission optical fiber and the shaping lens aims at enabling the laser incident to the light conversion device to be a laser beam with uniform power density distribution and a divergence angle close to zero.

Description

Technical Field

[0001] The utility model relates to laser lighting, in particular to a luminous flux measurement system of a fluorescent ceramic light converter. Background Art

[0002] The core technology of laser lighting is to use blue lasers to excite yellow fluorescent materials to produce high-brightness white light. Fluorescent materials are a key factor in determining the optical performance of laser lighting, and their luminous properties directly affect the light intensity and luminous flux of laser lighting products. Compared to phosphors and glass-ceramics, fluorescent ceramics offer excellent radiation resistance and high-power operating stability, making them the preferred fluorescent material for high-power laser lighting products. According to the principles of laser lighting, the total luminous flux of laser lighting products is composed of the blue light from the laser and the yellow light emitted by the fluorescent ceramic. However, analysis of the light spectrum and the human eye's photopic visual function curve reveals that over 98% of the luminous flux of laser lighting products comes from the yellow light generated by the light conversion of the fluorescent ceramic. Therefore, precise testing of the luminous flux of fluorescent ceramics in laser lighting products is of great significance, as it provides accurate luminous flux data for optical design and simulation analysis.

[0003] However, during actual luminous flux testing of fluorescent ceramics used in high-power laser illumination, researchers discovered that the laser beam's Gaussian distribution, particularly in the center of the spot, exhibited a point-like distribution with unusually high power density, seriously affecting the accuracy of the test results. Furthermore, during testing, the laser beam illuminated the fluorescent ceramic surface perpendicularly, causing a significant amount of converted light (emitted by the fluorescent ceramic) to propagate in the reverse direction, passing through the aperture and causing light loss, making it undetectable by the equipment. This resulted in significant deviations in the test results. Utility Model Content

[0004] The utility model aims to overcome the problem of abnormal laser beam power density distribution in existing fluorescent ceramic luminous flux testing devices for laser lighting, and to provide a novel fluorescent ceramic light converter luminous flux measuring system.

[0005] In order to achieve this purpose, the technical solution of the present invention is as follows: a fluorescent ceramic light converter luminous flux measurement system, comprising: a laser device, a light conversion device and a measuring device; the measuring device has an integrating sphere; the laser device has an excitation light source, an energy transmission optical fiber, a shaping lens and a filter, the excitation light source is outside the integrating sphere, the shaping lens and the filter are inside the integrating sphere, the energy transmission optical fiber starts from the excitation light source, passes through the through hole of the integrating sphere itself, and enters the inside of the integrating sphere; the light conversion device has fluorescent ceramics; the initial laser of the excitation light source is emitted through the energy transmission optical fiber and passes through the shaping lens and the filter in sequence to reach the fluorescent ceramics, the fluorescent ceramics converts the received initial laser into converted laser and returns it to the filter, and the integrating sphere is used to collect the converted laser reflected from the filter.

[0006] As a preferred solution of the fluorescent ceramic light converter luminous flux measurement system, the energy transmission optical fiber, the shaping lens, the filter and the fluorescent ceramic are on the same optical axis, and the filter is tilted relative to the optical axis.

[0007] As a preferred solution of the fluorescent ceramic light converter luminous flux measurement system, the excitation light source is a laser emitting blue light with a main wavelength of 455nm±10nm, and the output light power range is 0-100W.

[0008] As a preferred solution of the luminous flux measurement system of the fluorescent ceramic light converter, the material system of the fluorescent ceramic is Ce:YAG (Y3Al5O 12 ) base, and the emission wavelength range is 470nm-800nm.

[0009] As a preferred solution of the fluorescent ceramic light converter luminous flux measurement system, the light conversion device further has a heat sink, and the material of the heat sink is T2 copper.

[0010] As a preferred solution for the luminous flux measurement system of fluorescent ceramic light converters, the filter has a transmittance of greater than 99.5% for the initial laser and a full-angle reflectivity of greater than 99% for the converted laser; the initial laser damage threshold is greater than 100W / mm 2 .

[0011] As a preferred solution for the luminous flux measurement system of the fluorescent ceramic light converter, the shaping lens has a focal length of 50 mm to 80 mm and a divergence angle of ≤30°.

[0012] Compared with the prior art, the beneficial effects of the present invention are at least as follows: the purpose of providing the energy transmission optical fiber and the shaping lens is to make the laser incident on the optical conversion device a laser beam with uniform power density distribution and a divergence angle close to zero; the purpose of providing the filter is to transmit the initial laser from the energy transmission optical fiber and reflect the converted laser from the optical conversion device, so that the converted laser from the optical conversion device can remain inside the integrating sphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0015] See Figure 1 , the figure shows a luminous flux measurement system of a fluorescent ceramic light converter with laser shaping.

[0016] The fluorescent ceramic light converter luminous flux measurement system includes: a laser device 10, a light conversion device 20, a measurement device 30, and the like.

[0017] The measuring device 30 includes an integrating sphere 33 (including a photometer) and a stage 32 inside the integrating sphere 33 .

[0018] The laser device 10 comprises an excitation light source 11, an energy transmission fiber 12, a shaping lens 13, and a filter 14. The excitation light source 11 is used to provide uniform, stable, and power-adjustable initial laser light. The energy transmission fiber 12 is used to transmit the initial laser light. The shaping lens 13 is used to shape the spot shape of the initial laser light. The filter 14 is tilted 45° relative to the optical axis. The filter 14 is used to transmit the initial laser light and reflect the converted laser light.

[0019] The excitation light source 11 is located outside the integrating sphere 33. The shaping lens 13 and the optical filter 14 are located inside the integrating sphere 33 and are placed on the stage 32. The energy transmission fiber 12 originates from the excitation light source 11, passes through the through hole 31 of the integrating sphere 33, and enters the interior of the integrating sphere 33. The energy transmission fiber 12, the shaping lens 13, the optical filter 14, and the optical conversion device 20 are located on the same optical axis. The initial laser light from the energy transmission fiber 12 passes through the shaping lens 13 and the optical filter 14 and reaches the optical conversion device 20.

[0020] The light conversion device 20 includes a fluorescent ceramic 21 and a heat sink 22. The fluorescent ceramic 21 and heat sink 22 are placed on the stage 32. The fluorescent ceramic 21 is fixed to the heat sink 22, and the two are tightly attached. The heat sink 22 dissipates heat from the fluorescent ceramic 21. The fluorescent ceramic 21 converts the received initial laser light into converted laser light and returns it to the filter 14. The converted laser light is reflected by the filter 14 and reaches the integrating sphere 33. The integrating sphere 33 collects the converted light and performs measurement and analysis.

[0021] During specific implementation, the initial laser is blue light.

[0022] In a specific implementation, the material system of the fluorescent ceramic 21 is Ce:YAG (Y3Al5O 12 ) base, and the emission wavelength range is 470nm-800nm.

[0023] In a specific implementation, the heat sink 22 is made of T2 copper.

[0024] In specific implementation, the transmittance of the filter 14 to blue light is greater than 99.5%, and the full-angle reflectivity to light with a wavelength of 470nm-800nm is greater than 99%; the initial laser damage threshold is greater than 100W / mm 2 .

[0025] In a specific implementation, the excitation light source 11 is a laser that emits blue light with a main wavelength of 455nm±10nm, and an output light power range of 0-100W.

[0026] In a specific implementation, the shaping lens 13 has a focal length of 50 mm to 80 mm and a divergence angle of ≤30°.

[0027] While the above merely describes the embodiments of the present invention, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A fluorescent ceramic light converter luminous flux measurement system, characterized in that: include: A laser device, a light conversion device and a measuring device; the measuring device has an integrating sphere; the laser device has an excitation light source, an energy transmission fiber, a shaping lens and a filter, the excitation light source is outside the integrating sphere, the shaping lens and the filter are inside the integrating sphere, the energy transmission fiber starts from the excitation light source, passes through the through hole of the integrating sphere itself, and enters the inside of the integrating sphere; the light conversion device has fluorescent ceramics; the initial laser of the excitation light source is emitted through the energy transmission fiber and passes through the shaping lens and the filter in sequence to reach the fluorescent ceramics, the fluorescent ceramics converts the received initial laser into converted laser and returns it to the filter, and the integrating sphere is used to collect the converted laser reflected from the filter.

2. The fluorescent ceramic light converter luminous flux measurement system according to claim 1, characterized in that: The energy transmission optical fiber, the shaping lens, the filter and the fluorescent ceramic are on the same optical axis, and the filter is tilted relative to the optical axis.

3. The fluorescent ceramic light converter luminous flux measurement system according to claim 2, characterized in that: The excitation light source is a laser emitting blue light with a main wavelength of 455nm±10nm, and an output light power range of 0-100W.

4. The fluorescent ceramic light converter luminous flux measurement system according to claim 2, characterized in that: The material system of the fluorescent ceramic is Ce:YAG (Y3Al5O 12 ) base, and the emission wavelength range is 470nm-800nm.

5. The fluorescent ceramic light converter luminous flux measurement system according to claim 2, characterized in that: The light conversion device further comprises a heat sink, and the heat sink is made of T2 copper.

6. The fluorescent ceramic light converter luminous flux measurement system according to claim 2, characterized in that: The filter has a transmittance greater than 99.5% for the initial laser and a full-angle reflectivity greater than 99% for the converted laser; the initial laser damage threshold is greater than 100W / mm 2 .

7. The fluorescent ceramic light converter luminous flux measurement system according to claim 2, characterized in that: The shaping lens has a focal length of 50 mm to 80 mm and a divergence angle of ≤30°.

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