Raman Butterfly Laser Diode

By Ondax

These lasers come in an industry‑standard 14‑pin butterfly package, with either fiber‑coupled output (standard: 1 m, FC/PC, 0.22 NA, 105 µm MM fiber, 900 µm jacket) or free‑space output. Typical spectral bandwidth is ~0.07–0.09 nm (wavelength‑dependent), with SMSR ≥ 40 dB. The PowerLocker® VHG provides wavelength stabilization with < 0.010 nm/°C dependence over a broad stabilized temperature range. Threshold current: 250–325 mA (wavelength‑dependent) Operating current (typ–max): 800–1200 mA (typical) up to 1000–1600 mA (max), model‑dependent Operating voltage: ~1.9–2.5 V (typical–max, wavelength‑dependent). Always confirm the exact line in the datasheet table for your wavelength/SKU. TEC current (max): 2 A TEC voltage (max): 4 V Thermistor: 10 kΩ NTC, Beta 3450 Central stabilized temperature: 28 °C (typ), usable 20–40 °C; specified stabilized range ≥ 10 °C. Use a good thermal path and thermal paste; thermal runaway is possible if heat is not removed effectively. For free‑space models, polarization is typically >50:1. Multimode fiber-coupled units are mixed polarization. Free‑space beam divergence (typ.): V×H ≈ 3 mrad × 25 mrad (638 nm is ~3×11 mrad). Fiber‑coupled output is through 0.22 NA, 105 µm MM fiber. Because we tightly control wavelength accuracy and tolerance, it is important to specify the reference medium used for wavelength measurement. Light travels slightly more slowly in air than in vacuum, causing the wavelength in air to be marginally shorter. To avoid ambiguity and ensure consistency, wavelengths in our datasheets are vacuum‑referenced, which is also the convention used by many spectroscopy databases. As an example, a HeNe laser specified at 632.991 nm in vacuum corresponds to 632.816 nm in air. This difference does not indicate a physical change in the laser, only a difference in how the wavelength is referenced. Laser diodes are highly ESD‑sensitive; keep anode/cathode shorted when not in use. Use a static‑free work area, grounded wrist straps, and conductive containers. Latent ESD damage can shorten lifetime. Mount stress‑free on a flat, thermally conductive surface with thermal paste. Primary heat removal is through the baseplate; inadequate heat sinking can cause thermal runaway and permanent damage. The lasers are wavelength‑stabilized across 0–100% power, which helps keep Raman shift calibration tight during power ramping. The narrow spectral bandwidth (e.g., ~0.08 nm typical at 785/830/976 nm) and high SMSR improve rejection of ASE and side modes in spectrometers. ASE bandpass filters are required.