850nm VCSEL Array with 24 Emitters for Short Distance Probing
PAM-XIAMEN supplies 850nm VCSEL array with 24 emitters, which can be used in tablet computers, sweeping robots, distance detection of the rear camera of mobile phones (1D ToF), and short distance detecting of smart machines, etc. Performance parameters have been listed as below for your reference:
1. 850nm VCSEL Array Product Description & Features
Item No. PAM850V024K
· 850nm VCSEL Array
· 170-195mW @ 185mA
Number of emitters: 24
2. 850nm VCSEL Chip Mechanical Characteristics
| Number of emitters | 24 |
| Chip width | 325±20um |
| Chip length | 325±20um |
| Chip height | 100±10um |
| Aperture | 12±2um |
3. Electro-Optical Characteristicsof 850nm VCSEL Array Chip with 24 Emitters
| Parameters | Symbol | Min | Typical | Max | Units | Test Condition |
| Threshold current | Ith | 15 | 20 | 25 | mA | @185mA, 25℃, CW mode |
| Operating voltage | Vf | 1.90 | 2.05 | 2.20 | V | |
| Wavelength | λpeak | 845 | 850 | 855 | nm | |
| Output optical power | P | 170 | 185 | 195 | mW | |
| Slope efficiency | ηs | – | 1 | – | W/A | |
| Power conversion efficiency | PCE | 40 | 45 | – | % | |
| Beam full divergence (D86) | φ | 25 | ||||
| Wavelength Temp. coefficient | dλ/dT | 0.07 | nm/℃ |
4. Typical Performance Curves of 850nm VCSEL Chip with 24 Emitters
5. Absolute Maximum Ratings of 850nm VCSEL Array with 24 Emitters
| Parameters | Conditions |
| Forward DC current | <250mA |
| Storage temperature | -40 to 85℃ |
| Packaging temperature | ≤260℃(<10S) |
| Junction temperature | ≤120℃ |
6. Requirements for Different Application Scenarios of VCSEL
Different applications have different performance requirements for VCSEL, with the most important being power. Higher power requires more mirrors (as shown in the figure below), posing a challenge to the process. The green and gray areas in the figure are reflective mirrors, in which light reflects and gathers energy. Therefore, the more mirrors there are, the higher the energy provided by a single VCSEL. In order to reduce the energy loss of light in reflection, the thickness of each layer of reflection mirror needs to be precisely controlled at a quarter of the emission wavelength, about 200-300 nanometers.
Typical VCSEL Structure
With the development of technology, the power of VCSEL continues to increase, and the application areas are gradually expanding. It has structural characteristics, with both long-term imagination space and short-term landing demand coexisting. Although applications in the field of optical communication have low power requirements, they require high stability of modulation signals and require longer customer verification cycles.
| Application Scope | Demand Power | Number of mirrors | Package size (square millimeters) |
| Optical communication and proximity sensors | 3-40mW | 1-8 | 0.02-0.06 |
| Gesture recognition and laser focusing | 10-350mW | 3-60 | 0.06-0.4 |
| 3D sensing and laser medical treatment | 200-100mW | 30-200 | 0.4-1.3 |
| Lidar and laser cutting (potential) | 5-40W | 100-5000+ | 10-40 |
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