Cr2+:ZnS

Cr²⁺:ZnS is a laser gain medium formed by doping divalent chromium ions (Cr²⁺) into zinc sulfide (ZnS) crystals. Its core advantages reside in ultra-broadband tunable laser emission in the 2–3μm and exceptional passive Q‑switching performance, establishing it as one of the key materials for contemporary mid-infrared solid-state laser technologies.

Mid-Infrared Tunable Lasers (Gain Medium):Serving as the active gain medium, it enables efficient laser emission across the 2–3μm.

Military & Security:

IR Countermeasure Systems: Jamming enemy thermal imaging and missile guidance

LiDAR: Operating at the 2.0-2.5μm atmospheric transmission window with a detection range of 50 km+

Scientific Research & Instruments

Molecular Spectroscopy Analysis: Covering the fingerprint regions of various molecules

OPO Pump Source: Efficiently driving mid-infrared optical parametric oscillators (OPOs) to extend the wavelength coverage to 5–12μm.

Medical Applications:

Surgical Operations: Utilizing the 2.1–2.3μm water absorption peak for precise tissue dissection with minimal thermal damage

Dental Treatment: Enabling hard tissue ablation with 3x higher efficiency than conventional Nd:YAG lasers

Passive Q-Switching:serving as a passive Q-switch, it produces high-peak-power pulses.

Tm/Ho-Doped Lasers:

Passive Q-switching in the 1.9–2.1 μm, with pulse width as short as 29 ns and peak power at the 10⁶ W level

Maximum average output power up to 14.8 W (Ho:YAG ceramic laser)

Comparison Between Cr²⁺:ZnS and Cr²⁺:ZnSe:

With three core advantages—ultra-broadband tunable mid-infrared emission, excellent thermal mechanical properties, and no excited-state absorption—Cr²⁺:ZnS has become one of the preferred materials for mid-infrared laser technology, with wide applications in military, scientific research, medical and other fields.