850nn VCSEL Array Chip with 233 Emitters for Laser Ranging and Lighting
850nm VCSEL array with 233 emitters can be supplied for laser ranging and lighting, such as robot distance detection, supplementary lighting, intelligent door locks, and etc. For more parameters of electro-optical, mechanical, performance curve etc. please read as follows:
1. Product Description & Features of 850nm VCSEL Array
Item No. PAM850V233K
· 850nm VCSEL Array
· 1.15W @ 1.3A
Number of emitters: 233
2. 850nm VCSEL Array Chip Mechanical Characteristics
| Number of emitters | 233 |
| Chip width | 708±20um |
| Chip length | 734±20um |
| Chip height | 100±10um |
| Aperture | 11±2um |
| Bonding pad | 110um*714um |
3. Electro-Optical Characteristics for 850nm VCSEL Array Chip with 233 Emitters
| Parameters | Symbol | Min | Typical | Max | Units | Test Condition |
| Threshold current | Ith | – | 245 | – | mA | @1.3A, 25℃, 0.5ms, 2% |
| Operating voltage | Vf | 1.90 | 2.12 | 2.30 | V | |
| Wavelength | λpeak | 840 | 850 | 860 | nm | |
| Output optical power | P | 1100 | 1150 | 1250 | mW | |
| Slope efficiency | ηs | – | 1.2 | – | W/A | |
| Power conversion efficiency | PCE | 40 | 46 | – | % | |
| Beam full divergence (D86) | φ | 25 | ||||
| Wavelength Temp. coefficient | dλ/dT | 0.07 | nm/℃ |
4. Typical Performance Curves of 850nm VCSEL with 233 Emitters
Test conditions: wafer test, 0.5ms, 2%
5. Absolute Maximum Ratings for 850nm VCSEL Array Chip with 233 Emitters
| Parameters | Conditions |
| Forward DC current | ≤3A |
| Storage temperature | -40 to 85℃ |
| Packaging temperature | ≤260℃(<10S) |
| Junction temperature | ≤120℃ |
6. VCSEL Application Development
VCSEL will be applied in consumer electronics sensing and optical communication, as well as in LiDAR (automotive/industrial). VCSEL originated in 1979 and was initially applied in short-range data communication (optical chips). Later, it was applied in some consumer electronics that have a demand for small volume and low-power light sources, such as mice, laser printers, etc. Since 2014, VCSEL has been applied in sensors, replacing LED in short distance ranging scenarios such as mobile proximity sensors and sweeping robots. In 2017, VCSEL was successfully applied to the iPhone 8 facial recognition module and began to receive widespread attention; At the same time, due to the increase in power, it is gradually being applied in medium and long-distance fields such as LiDAR and security lighting.
The iPhone X has gradually made 3D facial recognition a standard feature in high-end smartphones, and the VCSEL laser chip is a key component of 3D sensing technology. The release of the iPhone X in September 2017 led the trend of 3D sensing, and within the following year, related phone manufacturers launched new smartphones with 3D sensing capabilities. 3D sensing uses laser for ranging, and the laser source is a VCSEL (vertical cavity surface emitting laser) laser chip.
The application of VCSEL chip in facial recognition: Firstly, the VCSEL in the distance sensor emits infrared light. When the reflected light is detected, it is considered that an object is approaching; Secondly, the VCSEL array in the floodlight sensing element emits a higher power infrared beam for illumination, while the infrared camera performs two-dimensional imaging and determines whether it is a face through software algorithms; If it is determined to be a face, the VCSEL array in the dot matrix projector emits structured infrared light to measure the distance between various points on the face, form a 3D image, and then determine whether it is the user themselves.
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