Optics and transmitter parameters, by model

Name: ERDI laser rangefinder optics and transmitter parameters
Creator: ERDI TECH LTD
Published: 2026-10-23
License: https://creativecommons.org/licenses/by/4.0/

Divergence, receiver aperture, pulse energy and update rate for 50 models — the four numbers that decide the photon budget, plus the spot diameter they produce at 1 km so the effect of divergence is visible rather than theoretical.

The table

Model	Wavelength	Divergence	Spot at 1 km	Receiver / lens	Pulse energy	Update rate
LRF0815C	1535 nm	0.3 mrad	0.3 m	12 mm	300 µJ	10 Hz
LRF0612C	1535 nm	0.3 mrad	0.3 m	12 mm	200 µJ	10 Hz
LRF0816C	1535 nm	0.3 mrad	0.3 m	12 mm	300 µJ	10 Hz
LRF1017C	1.54 µm	0.3 mrad	0.3 m	12 mm	300 µJ	10 Hz
LRF1221C	1.54 µm	0.3 mrad	0.3 m	12 mm	300 µJ	10 Hz
LRF1222C	1.54 µm	0.3 mrad	0.3 m	16.5 mm	300 µJ	10 Hz
LRF1525C	1.54 µm	0.3 mrad	0.3 m	15 mm	500 µJ	10 Hz
LRF1829C	1535 nm	0.3 mrad	0.3 m	18 mm	500 µJ	10 Hz
LRF1830C	1.54 µm	0.3 mrad	0.3 m	18 mm	500 µJ	10 Hz
LRF0818C	1535 nm	0.4 mrad	0.4 m	26 mm	300 µJ	10 Hz
LRF0609C	1535 nm	0.5 mrad	0.5 m	26 mm	200 µJ	10 Hz
LRF0610C	1535 nm	0.5 mrad	0.5 m	10 mm	200 µJ	10 Hz
LRF0405C	1535 nm	0.6 mrad	0.6 m	8 mm	200 µJ	10 Hz
LRF0305C	1535 nm	0.6 mrad	0.6 m	—	100 µJ	10 Hz
LRF0306C	1535 nm	0.6 mrad	0.6 m	—	100 µJ	3 Hz
LRF0310C	1535 nm	0.6 mrad	0.6 m	8 mm	100 µJ	10 Hz
LRF0105C	1535 nm	1 mrad	1.0 m	8 mm	100 µJ	10 Hz
LRF1831C	1535 nm	1.3 mrad	1.3 m	60 mm	350 µJ	10 Hz
ER10000	1535 nm	4 mrad	4.0 m	—	10 µJ	5 Hz
ER2000	1535 nm	4 mrad	4.0 m	—	2 µJ	10 Hz
ER4000	1535 nm	4 mrad	4.0 m	—	4 µJ	5 Hz
ER8000	1535 nm	4 mrad	4.0 m	—	8 µJ	5 Hz
LR1200E2	905 nm	4 mrad	4.0 m	9.2 mm	—	10 Hz
LR1200E4	905 nm	4 mrad	4.0 m	9.2 mm	—	10 Hz
SPD1200N0	905 nm	4.5 mrad	4.5 m	6.5 mm	—	15 Hz
SPD1200N2	905 nm	4.5 mrad	4.5 m	6.5 mm	—	15 Hz
SPD1200N4	905 nm	4.5 mrad	4.5 m	6.5 mm	—	15 Hz
LR1000D23	905 nm	6 mrad	6.0 m	20 mm	—	12 Hz
LR1200D23	905 nm	6 mrad	6.0 m	20 mm	—	10 Hz
LR1500D23	905 nm	6 mrad	6.0 m	20 mm	—	10 Hz
LR1500E2	905 nm	6 mrad	6.0 m	9.2 mm	—	10 Hz
LR1500E4	905 nm	6 mrad	6.0 m	9.2 mm	—	10 Hz
LR2000E2	905 nm	6 mrad	6.0 m	9.2 mm	—	10 Hz
LR2000E4	905 nm	6 mrad	6.0 m	9.2 mm	—	10 Hz
SPD1200N3	905 nm	6 mrad	6.0 m	—	—	15 Hz
SPD1200S2	905 nm	6 mrad	6.0 m	9 mm	—	15 Hz
SPD1200Z2	905 nm	6 mrad	6.0 m	—	—	20 Hz
SPD1200ZG	905 nm	6 mrad	6.0 m	6.5 mm	—	10 Hz
ER300	1535 nm	7 mrad	7.0 m	—	300 µJ	10 Hz
ER400	1535 nm	7 mrad	7.0 m	—	400 µJ	10 Hz
ER500	1535 nm	7 mrad	7.0 m	—	500 µJ	10 Hz
ER800	1535 nm	7 mrad	7.0 m	—	800 µJ	10 Hz
ER900	1535 nm	7 mrad	7.0 m	—	900 µJ	5 Hz
ER100	1.54 µm	8 mrad	8.0 m	—	100 µJ	10 Hz
ER200	1535 nm	8 mrad	8.0 m	—	200 µJ	10 Hz
LR1000E2	905 nm	9 mrad	9.0 m	9.2 mm	—	10 Hz
LR1000E4	905 nm	9 mrad	9.0 m	9.2 mm	—	10 Hz
MINI-100	1535 nm	10 mrad	10.0 m	—	100 µJ	10 Hz
LRF3000A1	905 nm	10 mrad	10.0 m	—	—	10 Hz
LRF1200A1	905 nm	—	—	6.6 mm	—	3 Hz

What the numbers mean together

Divergence sets the spot: 0.3 mrad is 0.3 m at 1 km and 6 m at 20 km. A target smaller than the spot behaves as a point target — return falls with the fourth power of distance.
Receiver aperture is the second-largest lever after pulse energy: received power scales with area, so doubling the diameter quadruples the collected return. That is why the long-range modules carry 60 mm receivers and the 905 nm sensors carry 6.5 mm.
Pulse energy is limited by eye safety at each wavelength: a 905 nm design cannot carry the energy a 1535 nm design can, which is the entire reason two wavelength families exist.
Update rate trades against energy: the 1535 nm sources run 0.5–10 Hz because a rod is being pumped, while silicon-detector modules reach kilohertz.

Where a figure is not published, this table shows a dash. Do not read a dash as zero — read it as "ask the manufacturer before you assume".

Working out the photon budget? Send the target size, the reflectance and the distance you need to cover. Email tommy@erdimail.com Divergence and aperture explained

Transcribed 2026-10-23; spot diameter = divergence × distance (initial beam diameter ignored). Each row links to its model page. Dataset: CSV.