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Gas Sensing · TDLAS Sources & Detectors
DFB / VCSEL 760 – 1742 nm + matched photodetectors
Availability confirmed at enquiry This family is supplied to order rather than held on the shelf — send us the specification and the annual volume and we will confirm stock, tooling and lead time before you commit.
A complete optical core for tunable-diode laser absorption spectroscopy: a DFB or VCSEL source on the exact absorption line of the target gas, a spectrally matched photodetector, and a turnkey methane sensor module for customers who would rather buy the finished optical assembly than build one.
- Eleven target gases covered from a single wavelength portfolio
- 1653.7 nm source and 1654 nm detector matched as a pair
- Detector: 0.9 A/W at 1654 nm, ≤ 0.5 nA dark current
- LZ-CH4-1653.7-MICL turnkey module: 0 – 100 % LEL, UART output, > 10 year life
1653.7 nm source — optical and electrical characteristics (Tc = 25 °C)
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Threshold current | Ith | — | 12 | 15 | mA |
| Output power | Po | 4 | 4.5 | — | mW |
| Forward voltage | Vf | — | 1.45 | 1.6 | V |
| Peak wavelength | λp | 1652 | 1653 | 1654 | nm |
| Side-mode suppression ratio | SMSR | 35 | 45 | — | dB |
| Reverse voltage | Vr | — | — | 2 | V |
| Operating temperature | Top | −20 | — | 85 | °C |
| Storage temperature | Tstg | −40 | — | 100 | °C |
| Storage humidity | RH | — | — | 65 | % |
| Soldering temperature | Ts | — | — | 300 | °C |
Configurations
Expand a group to see the model table. All powers are peak pulse power at 25 °C unless the table states otherwise.
Wavelength portfolio by target gas
Each source is specified on the absorption line of the target molecule. Sources are matched with a detector and, if required, a reference cell.
| Centre wavelength | Source type | Target gas |
|---|---|---|
| 760 nm | VCSEL / DFB | Oxygen (O₂) |
| 1273 nm | DFB | Hydrogen fluoride (HF) |
| 1392 nm | DFB | Water vapour (H₂O) |
| 1512 nm | DFB | Ammonia (NH₃) |
| 1532 nm | DFB | Acetylene (C₂H₂) |
| 1567 nm | DFB | Carbon monoxide (CO) |
| 1578 nm | DFB | Hydrogen sulphide (H₂S) |
| 1620 nm | DFB | Ethylene (C₂H₄) |
| 1653 nm | DFB | Methane (CH₄) |
| 1676 nm | DFB | Ethane (C₂H₆) |
| 1742 nm | DFB | Hydrogen chloride (HCl) |
Matched photodetector — 1654 nmH-O-S-PD500L-1653
TO-can photodetector with a 1 mm optical window chip, matched to the 1653.7 nm methane source.
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Responsivity | R | λ = 1654 nm | 0.8 | 0.9 | — | A/W |
| Dark current | Id | Vr = −5 V | — | — | 0.5 | nA |
| Capacitance | C | Vr = −5 V, f = 1 MHz | — | 10 | 20 | pF |
| Operating temperature | Top | — | −40 | — | 85 | °C |
| Storage temperature | Tstg | — | −40 | — | 85 | °C |
| Forward current | IF | — | — | — | 10 | mA |
LZ-CH4-1653.7-MICL turnkey methane sensorLZ-CH4
A finished laser methane sensor with an integrated 1653.7 nm source. Domestic and industrial methane detection, with a serial output your instrument can read directly.
| Parameter | Value |
|---|---|
| Target gas | Methane (CH₄) |
| Supply voltage | DC 3.2 – 3.6 V |
| Operating current | < 300 mA |
| Interface level | 3.0 V |
| Measurement range | 0 – 100 % LEL (customisable) |
| Measurement error | ±3 % LEL at 25 °C |
| Output signal | UART / TTL, 3.0 V level |
| Warm-up time | 15 s |
| Response time | T90 < 15 s |
| Resolution | 0.1 % LEL |
| Operating temperature | −13 to +58 °C |
| Operating humidity | 0 – 95 % RH (non-condensing) |
| Operating pressure | 80 – 116 kPa |
| Storage temperature | −20 to +60 °C |
| Dimensions | 76.5 × 21 × 14.1 mm |
| Weight | < 20 g |
| Lifetime | > 10 years |
Product views
Typical applications
Where this family is usually designed in:
Send us the specification you need to hit.
Wavelength, peak power, package and annual volume is usually enough for us to quote — and to say whether a sample is available from stock.