As a domestic Vcsel chip design and production enterprise, LEMON Photonics can not only provide industry-specific point/line laser modules, but also provide personalized customized product solutions according to the application scenarios of end customers.
Prouct solutions as follow:
In order to solve the problems related to different solutions, LEMON Photonics proposed a variety of solutions respectively.
They are:
▶ Large-angle flat top light field VCSEL line laser module scheme for ToF
Figure 3: VCSEL line laser module of LEMON photonics linear structured light obstacle avoidance radar
LEMON Photonics VCSEL series line laser module adopts customized VCSEL array chip and specially designed large-angle line mirror to achieve high-quality linear light field. Its advantages over traditional EEL line light sources are as follows:
(1) The industry's first large-angle flat-top light field: the distribution of 120° large-angle flat-top light field without edge breakage has stronger edge energy and is more conducive to large-angle radar to make up for edge energy ( Figure 4 for comparison of the light field distribution of traditional EEL modules);
(2) Narrower laser linewidth: the energy is more concentrated, and the signal-to-noise ratio is effectively improved in the airspace;
(3) The temperature drift coefficient is small: it is 1/5 of the EEL, and a narrower band filter can be used at the receiving end to effectively improve the signal-to-noise ratio in the frequency domain;
(4) Higher reliability: VCSEL light-emitting surface is uniform than EEL, with higher relative power density and better reliability;
(5) Cost-effective: VCSEL provides more optimized costs in chip, packaging and module assembly.
(a) （b）
Figure 4: Comparison of the light field of lemon photon VCSEL line light source and EEL line light source:
(a) The VCSEL line light source achieves a light field of 120°, of which the flat top light distribution is greater than 90°;
(b) The traditional EEL line light source has a near-Gaussian light field distribution, the edge energy does not meet the sensing signal requirements, and the line is broken at a large angle
The LEMON photonics line laser module has an M-shaped light field distribution, and the M-type light field distribution with strong edge energy is more conducive to large-angle radar to make up for edge energy. Far-field narrow-edge energy is more concentrated.
LEMON photonics line module measured spot
LEMON photonics line module light field distribution in large angle direction Light field distribution in small angle direction
808nm Line Laser Modules
The VCSEL chip mass-produced by Deep Lemon Photonics has 808/850/940nm and multi-junction and multi-partition VCSELs, with optical power of 10mW~10W, pulsed optical power of hundreds of watts, and peak electro-optical conversion efficiency PCE as high as 56%; The 940/976nm 2W-8W HCSEL (Horizontal Cavity Surface Emitting Laser) chip is the first exclusive product pioneered by Lemon Photonics, which has a narrow spectral width, higher reliability, and low thermal resistance; 920/976nm EEL chip power up to 25W, 45W and 50W or more high power optional; Point, line and surface laser modules cooperate with the excellent optical design of Lemon Photon to meet the pain points of customers. Products are widely used in automotive radar, industrial processing, face recognition, laser medical beauty and other fields.
