905 nm application teardown

Anatomy of a 905 nm laser rangefinder

A rangefinder is four parts and one optical budget. Pick a part from the bill of materials, drop it on the module, and read the parameters that decide whether the design reaches 10 m or 2 km - each one with the catalogue parts that carry it.

이 페이지 사용법

1부품표에서 부품 하나를 고릅니다.
2모듈 위에 놓거나 카드를 그냥 클릭합니다.
3그 역할과 파라미터, 그리고 이를 담당하는 모델명을 읽습니다.

부품표

모든 부품이 하나의 광학 버짓 안에 있습니다. 카드를 사진 위로 끌어 놓거나 클릭하십시오. 옆 패널이 그 부품의 파라미터로 채워집니다.

A 905 nm laser rangefinder module: two optical windows on the front face and the driver board on top

여기로 부품을 끌어 놓기 또는 부품표에서 카드를 클릭

Front face, two optical windows: transmit on the left, receive on the right. Driver board on top.

부품 위치는 교육용 도식이며 조립도가 아닙니다. 배치와 분해 보기는 참고용입니다. 파라미터 값은 링크된 사양의 값입니다.

모든 부품을 파라미터별로

인터랙티브 보기와 같은 수치를 읽고 검색하고 인용할 수 있는 표로 정리했습니다.

905 nm laser diode Transmitter

Emits the ranging pulse. Peak power, pulse width, divergence and emission timing together decide how far the system reaches and how much power it burns.

905 nm laser diode - Laser Diode | edge emitter
Peak wavelength	905 nm (895 - 915 nm)
Peak output power	40 - 600 W
Pulse energy @ 100 ns	4 - 30 uJ
Number of emitters	3 - 9 stacked
Aperture size (w x h)	110 x 30 um
Beam divergence, FWHM	9 x 25 deg bare \| 9 x 6 deg FAC
Pulse width	1 - 100 ns (max 100 ns)
Duty cycle, max	0.1 %
Repetition rate	up to 10 kHz
Operating current	12 - 55 A
Operating voltage	12.6 - 80 V
Package	TO56 \| metal stack \| bare die

Avalanche photodiode Receiver

Sets how faint an echo the system can still see. Sensitivity only means something together with responsivity, gain, dark current, bandwidth, bias stability and the receive aperture.

Avalanche photodiode - Avalanche Photodiode | silicon
Response spectrum	400 - 1100 nm
Wavelength	905 nm
Active diameter	230 um \| 500 um \| 16 elements
Responsivity	80 A/W @ M=100
Response time	0.5 ns
Dark current	0.4 nA @ M=100
Total capacitance	1.0 pF @ M=100
Optimum gain	100
Reverse breakdown voltage	100 - 200 V
Voltage temp. coefficient	1.1 - 1.4 V/C
Optical filter	905 nm spike filter
Package	TO-46 \| LCC1 / LCC2 ceramic \| linear array

Optics Optical path

Transmit optics set the spot size, the divergence and the eye-safety geometry. Receive optics set how much of the echo ever reaches the APD.

Optics - Transmit and receive light path
Optical channels	2 (transmit + receive)
Transmit beam, bare emitter	9 x 25 deg FWHM
Transmit beam, FAC	9 x 6 deg FWHM
Aperture size (w x h)	110 x 30 um
Receive aperture / focal length	Set by your module design 설계가 정하는 값
Receive filter	905 nm spike filter at the detector
Windows on the front face	2

Drive and timing electronics Electronics

Sets the pulse shape - width, rise time, jitter - and the receive bandwidth. Both feed straight into distance resolution and into the smallest pulse you can use.

Drive and timing electronics - Pulse driver and analog front end
Peak pulse current	70 A
Pulse width	50 ns - 1 us adjustable
Repetition rate	1 kHz - 30 kHz adjustable
Rise time	7.5 ns typical
Fall time	12 ns typical
Supply voltage	12 V DC
Laser drive voltage	1 - 50 V DC
Control interface	Internal trigger / external TTL
Factory default	100 ns @ 3 kHz, internal trigger

이 페이지의 모든 파라미터 값은 링크된 제품 페이지를 생성하는 카탈로그 기록에서 가져오므로 둘이 어긋날 수 없습니다.

이 파라미터를 뒷받침하는 부품

아래 모든 수치는 링크된 제품 페이지를 생성하는 것과 동일한 카탈로그 기록에서 읽습니다. 이 페이지에서 다시 적은 값은 없습니다.

Transmit chain

Pulsed 905 nm sources from 40 W to 600 W, in TO56, metal stack and collimated packages.

All 905 nm parts

PLD905-40W-M Entry Short-range handhelds and budget modules; 4 uJ still reaches hundreds of metres. Peak power40 W Pulse energy4 uJ PackageTO56 PLD905-100W-M Mid The mid-range default for consumer LiDAR and 100 - 300 m ranging. Peak power100 W Pulse energy10 uJ PackageTO56 PLD905-180W-M Flagship The long-range workhorse: 18 uJ, 6 stacked emitters, TO56. Peak power180 W Pulse energy18 uJ PackageTO56 PLD905-180W-MCL Collimated The same 180 W die with a fast-axis collimator, 25 deg down to 6 deg. Peak power180 W Pulse energy18 uJ PackageTO56 PLD905-600W-MA Flagship 600 W, 9 emitters, metal stack - multi-kilometre and coherent LiDAR. Peak power600 W Pulse energy30 uJ PackageMetal stack 905nm-70W-VCSEL VCSEL Surface emitter: circular 25 deg beam and low speckle, at lower peak power. Output power70 W Divergence25 deg PackageArray

Receive chain

Silicon APDs at 905 nm: two active areas, two package families, plus a 16-element array.

All APD detectors

To46-905APD-230 Receiver Hermetic TO-46, 230 um active area - the compact receive channel. Active area230 um Responsivity80 A/W @ M=100 PackageTO-46 LCC1-905APD-500-0.5 Receiver 500 um active area in an LCC1 ceramic package; easier to align. Active area500 um Responsivity80 A/W @ M=100 PackageLCC1 ceramic LCC2-905APD-500/230 Receiver Two active areas in one LCC2 package, 1.4 V/C temperature coefficient. Active area500 / 230 um Responsivity80 A/W @ M=100 PackageLCC2 ceramic 16-ch-APD-Array Array 16 elements on one die for flash LiDAR and multi-channel receivers. Active area16 elements Responsivity80 A/W @ M=100 PackageLinear array

Drive and timing

A 70 A nanosecond driver board that already has the timing generator on it, so the first prototype does not need a custom board.

Drive electronics

LZ-905-PD01 Driver 70 A peak, 50 ns - 1 us, 1 - 30 kHz, internal or external TTL, 12 V supply. Peak current70 A Pulse width50 ns - 1 us adjustable Repetition1 kHz - 30 kHz adjustable

This module is the 905 nm / pulsed / rangefinder scenario

Run the selector with application = rangefinder, wavelength = 905 nm and output = pulsed and it returns the transmit chain listed below. The teardown shows what those parts become once they are assembled, aligned and driven.

Browse all 905 nm parts 선정 도구 열기 Range equation

The receive side is the hard half

Send us the target, the range and the size limit. We come back with a transmit chain, a detector and the loss budget between them.

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