Description

The MMPD359-940 is a versatile dot projector with a 940nm wavelength, projecting a random speckle dot pattern with 17,595 dots. It has an integrated Field of Illumination (FOI) that meets the standard divergence angle specifications for biometric applications, with a divergence of 58˚ x 72˚.

Its optical shaping lens utilizes metalens technology, leveraging metasurface technology and semiconductor lithography processes. Made from Si material and SCHOTT glass substrates, this revolutionary product offers several key advantages.

The metalens is compact in size, and compared to traditional collimation and Diffractive Optical Element (DOE) combination solutions, the single metalens chip solution makes the module more compact after packaging, provides more uniform dot patterns, and enhances contrast. This not only simplifies assembly time and costs but also reduces assembly-induced errors and improves overall performance.

Thanks to the semiconductor lithography process used in the metalens, the product shows excellent consistency.

Features

- Integrated metalens MCPD359-940
  - - Semiconductor process with high product consistency
  - - Heat resistant and compatible with reflow / wave soldering processes

- Replaces two traditional lenses with a single lens
  - - Features a single piece optical shaping metalens
  - - Eliminates the need for a traditional collimation lens

- Field of Illumination (FOI):
  - - Inner FOI: 60.3˚ x 73.4˚
  - - Outer FOI: 77.5˚ x 87.4˚

- Laser wavelength: 940nm

- Spot pattern: 17,595 random speckles

- Maximum optical power: 2.1W

- Operating mode: Pulse

- Operating temperature range: -10°C ~ 60°C

Key Parameters

Maximum allowable value of the product

Items	Value	Unit	Notes
Forward current I_PEAK	4	A	Pulse, 1kHz, 10% Duty, T_A = 25˚C
Output optical power P_OP	2.1	W	Pulse, 1kHz, 10% Duty, T_A = 25˚C
Storage temperature T_STG	-30 ~ +70	˚C
Operating temperature T_OP	-10 ~ +60	˚C

Specifications

Parameter	Min	Typ	Max	Unit	Test Condition
Opto-electrical Parameters
Threshold current I_TH	0.24	0.55	0.7	A	Pulse, 50˚C
Output optical power P_OP	1.08	1.2		W	Pulse, 2.5A, 50˚C
Forward voltage V_F	1.5	2.0	2.3	V	Pulse, 2.5A, 50˚C
Wavelength λ	934	940	946	nm	Pulse, 2.5A, 50˚C
Line width of light source			2.5	nm	Pulse, 2.5A, 50˚C
Inner FOI Horizontal (D86)	58.3	60.3˚	62.3˚	Deg [˚]	Pulse, 2.5A, 50˚C
Inner FOI Vertical (D86)	71.4˚	73.4˚	75.4˚	Deg [˚]	Pulse, 2.5A, 50˚C
Number of random speckles		17595			Pulse, 2.5A, 50˚C
Divergence angle of a single dot		0.18		Deg [˚]	Illuminate with a single hole VCSEL
Geometric distortion		32		%	Illuminate with a single hole VCSEL
Contrust		39.2			Illuminate with a single hole VCSEL
Non-uniformity		14		%	Illuminate with a single hole VCSEL
Electrical Driving Parameters
Driving pulse width	1.5	20	100	ns	Optical parameters are obtained based on this driving condition
Modulation frequency	5	50	300	MHz
Pulse duty cycle		30	50	%
Burst width	0.1	1.0	3.0	ms
Burst duty cycle			50	%
Overall duty cycle		4	8	%