Our complete selection of laser diodes is available on the LD Selection Guide tab above.
Clicking this icon opens a window that contains specifications and mechanical drawings.
Clicking this icon allows you to download our standard support documentation.
Clicking the words "Choose Item" opens a drop-down list containing all of the in-stock lasers around the desired center wavelength. The red icon next to the serial number then allows you to download L-I-V and spectral measurements for that serial-numbered device.
Quantum and Interband Cascade Lasers (QCLs and ICLs)
CW Output up to 2500 mW
Center Wavelengths Between 3.00 µm and 11.00 μm (Wavenumbers Between 3333 cm-1 and 909 cm-1)
Broadband Fabry-Perot (FP) and Single-Frequency Distributed Feedback (DFB) Options
C-Mount, D-Mount, and HHL Lasers are Electrically Isolated from Their Mounts
Custom Wavelengths, Custom Packages, and OEM Quantities Also Available (Contact Tech Support for Details)
Gain Chips with AR-Coated Front Facets Also Available as a Custom Order
Thorlabs' Quantum and Interband Cascade Lasers (QCLs and ICLs) are composed of multiple quantum well heterostructures and utilize intersubband and interband transitions, respectively, to access the mid-infrared spectral region. They are offered in four packages: a two-tab C-mount, a Ø9 mm TO can, a D-mount, and a high heat load (HHL) package with horizontal emission. The two-tab C-mount and Ø9 mm TO can packages can be easily interfaced to our SM1 lens tubes, 30 mm cage systems, and 60 mm cage systems using the LDMC20 C-Mount Laser Mount or the LDM90 Laser Mount, respectively. The D-mount and HHL packages are intended for OEM applications and systems integration. Additional information is available in the Packages tab.
Fabry-Perot Lasers Fabry-Perot quantum cascade lasers exhibit broadband emission in a range spanning roughly 50 cm-1. The laser's specified output power is the sum over the full spectral bandwidth. Since these QCLs have broadband emission, they are well suited for medical imaging, illumination, and microscopy applications. The output spectrum and L-I-V curve of each serial-numbered device, measured by an automated test station, are available below and are also included on a data sheet that ships with the device.
Each Fabry-Perot quantum cascade laser has an HR-coated back facet. As a custom option, these QCLs can be ordered with an AR coating on the front facet; however, the custom item will operate as a gain chip and not as a CW laser. Although these lasers are specified for CW output, they are compatible with pulsed applications provided that the CW max operating current is not exceeded. For more information or to order a Fabry-Perot QCL with a tested and specified pulsed optical power or other custom features, please contact Tech Support.
Distributed Feedback Lasers Distributed feedback (DFB) quantum and interband cascade lasers emit at a well-defined center wavelength and provide single spatial mode operation. By tuning the input current and operating temperature, the output frequency can be tuned over a narrow range between 1 cm-1 and 5 cm-1. They are ideal for chemical sensing (see the Spectroscopy tab), optical communications, and other applications. The output spectrum, power, and L-I-V curve of each serial-numbered device, as measured by an automated test station, are available below and are also included on a data sheet with the laser. These quantum and interband cascade lasers are specified for CW output. While pulsed output is possible, this application prohibits current tuning, and performance is not guaranteed. For two-tab C-Mount and D-Mount lasers, some optical power is emitted through the rear facet; this output is not usable in applications.
Mounts, Drivers, and Temperature Control For two-tab C-mount quantum cascade lasers, we generally recommend the LDMC20 C-Mount Laser Mount and ITC4002QCL or ITC4005QCL Dual Current / Temperature Controller. This device combination includes all the necessary components to mount, drive, and thermally regulate a two-tab C-mount laser. Other compatible current and temperature controllers are listed in the Drivers tab. The LDM90(/M) Laser Mount along with the ITC4002QCL or ITC4005QCL can be used with the TO can laser, but the 8 W cooling capacity of the LDM90 will limit the driving current of the laser.
Click to Enlarge Fabry-Perot and Distributed Feedback Laser Comparison Fabry-Perot (FP) Lasers have broadband emission, while Distributed Feedback (DFB) Lasers emit at a well defined wavelength.
HHL lasers are compatible with any HHL mount, although cables for HHL packages are typically not rated for the 4.5 A maximum current of the internal thermoelectric cooler. D-mount lasers require custom mounts. Our ICLs emit a horizontally polarized beam at wavelengths as long as 3.5 µm, while our QCLs emit a vertically polarized beam at wavelengths as long as 11 µm.
If designing your own mounting solution, note that due to these lasers' heat loads, the laser must be mounted in a thermally conductive housing to prevent heat buildup. Heat loads for QCLs and ICLs can be up to 38 W, depending upon the wavelength and package. See the Handling tab for additional information.
The typical operating voltages of our QCLs and ICLs can be as high as 16 V and 8 V, respectively. These lasers do not have built-in monitor photodiodes and must be operated in constant current mode.
Thorlabs manufactures custom and OEM quantum cascade lasers in high volumes. We maintain a broad chip inventory at our Jessup, Maryland, laser manufacturing facility and we are accustomed to fulfilling specialized requests.
More details are available on the Custom & OEM Lasers tab. To inquire about pricing and availability, please contact us. A semiconductor specialist will contact you within 24 hours or the next business day.
Current and Temperature Controllers
Use the tables below to select a compatible controller for our MIR lasers. The first table lists the controllers with which a particular MIR laser is compatible, and the second table contains selected information on each controller. Complete information on each controller is available in its full web presentation. We particularly recommend our ITC4002QCL and ITC4005QCL controllers, which have high compliance voltages of 17 V and 20 V, respectively. Together, these drivers support the current and voltage requirements of our entire line of Mid-IR Lasers.
The typical operating voltages of our QCLs are 7 - 16 V, while the typical operating voltages of our ICL are 5 V to 8 V. To get L-I-V and spectral measurements of a specific, serial-numbered device, click "Choose Item" next to the part number below, then click on the Docs Icon next to the serial number of the device.
Laser Mount Compatibility Thorlabs' LDMC20(/M) C-Mount Laser Mount ships with current and TEC cables for the LDC4005, ITC4001, ITC4002QCL, ITC4005, and ITC4005QCL controllers. To use the LDMC20 with our other controllers, custom cables will be required. For our Ø9 mm TO can QCL we have the LDM90(/M) Laser Mount which is fully compatible with all of the controllers listed in the tables below; however, the mount itself has a limited heat load of 8 W, meaning the QCL cannot be driven at full power in this mount. If designing your own mounting solution, note that due to these lasers' heat loads, we recommend that they be secured in a thermally conductive housing to prevent heat buildup. Heat loads for QCLs and ICLs can be up to 38 W.
Please note that Thorlabs does not offer cables that connect high heat load lasers to our controllers, and that third-party cables for these packages are typically not rated for the 4.5 A maximum current of the internal thermoelectric cooler. Custom cables will be required.
Thorlabs does not currently offer cables that connect the LDMC20 mount to this controller. Custom cables will be required.
当社では、標準品の量子カスケードレーザ(QCL)を4種類のパッケージでご用意しています。研究および産業研究用途向けの2タブ型Cマウントパッケージ、OEMおよびシステム統合用途向けのDマウントパッケージならびに高熱負荷対応水平出力パッケージ、そして標準的なマウントに組み込みが簡単なØ9 mm TO-Can型パッケージです。これらのレーザーパッケージの取扱いについての情報は「取扱い」タブをご覧ください。カスタム仕様のパッケージもご提供可能です(詳細は「カスタム/OEM用レーザ」タブをご覧ください)。
2タブ型Cマウント 2タブ型Cマウントは、寸法6.4 mm x 4.3 mm x 7.9 mm(タブは含まれません)で、高い熱伝導性を有します。また、#2-56またはM2ネジ用Ø2.4 mmのザグリ貫通穴を通して他のマウントに固定することができます。駆動電圧および電流はタブから供給されます。Cマウントの外形寸法は同じですが、Cマウントの底部から発光部までの高さは、QCLで7.15 mmまたは7.39 mmです(レーザにより異なります)。こちらのページでご紹介しているすべての2タブ型Cマウントレーザは、Cマウントと電気的に絶縁されています。
Ø9 mm TO-Can型 Ø9 mm TO-Can型パッケージは熱伝導性が高く、高出力TO-Can型レーザ用の標準的なマウントに容易に組み込むことができます。パッケージには放熱機能を強化するために追加の銅製ディスクが内蔵されています。この追加により、TO-Canパッケージは標準より厚さがありますが、すべてのØ9 mmレーザーマウントに取り付け可能です。ARコーティング付きのセレン化亜鉛(ZnSe)ウィンドウがこの量子カスケードレーザを埃などから保護します。駆動電圧および電流はピンから供給され、 レーザ光はTO-Canの中心から出力されます。
This table is intended as a reference. Each DFB QCL and ICL is a unique device with its own spectrum, and does not necessarily emit at the exact absorption line required for a given experiment. To verify that the QCL you receive will meet your needs, please download its data sheet. Click "Choose Item" below, then click on the Docs icon () next to the serial number of the laser.
Gas-Phase Spectroscopy Using Distributed Feedback Lasers
Distributed Feedback Quantum and interband Cascade Lasers (DFB QCLs and ICLs) offer many attractive features for spectroscopy. They emit at a single wavelength within the mid-IR, where many gaseous species characteristically absorb. Moreover, their emission wavelength is easily tuned (typical tuning range: 1 - 5 cm-1) by changing the drive current and operating temperature of the laser, making them ideal for isolating narrow gas absorption lines. Finally, quantum cascade lasers offer relatively high output power (typically 40 - 120 mW at rollover current), helping improve measurement sensitivity. ICLs will typically have a low output power, but a far lower power consumption.
Thorlabs' DFB QCLs emit at wavelengths that range from 4.00 to 11.00 µm (2500 cm-1 to 909 cm-1), while our DFB ICLs emit at wavelengths that range from 3.00 to 3.50 µm (3333 cm-1 to 2857 cm-1). If we do not stock the wavelength required for your application, custom wavelengths are available by contacting Tech Support.
The tuning range of individual DFB QCLs and ICLs depends greatly on the actual laser device. Each DFB QCL or ICL is a unique device with its own threshold current, rollover current, and spectrum. With typical lasers, it is usually preferable to operate the laser at or near the rollover current, since the output power is lowest at threshold and highest at rollover. On the other hand, the wavelength of DFB QCLs and ICLs changes as a function of the current, so operating at the rollover current is not always possible in spectroscopy measurements, which require specific wavelengths. (It is important to note that the output power is not constant over the entire tuning range.)
Tuning Example To demonstrate the tunability of these lasers, we measured the center wavelength of a previous-generation QD4580CM1 DFB QCL as a function of drive current, from threshold to near rollover, at 15 °C and 25 °C. Over the entire temperature and drive current range, we obtained center wavelengths from 4.568 µm to 4.586 µm (2189.14 cm-1 to 2180.77 cm-1), spanning a range of 18 nm (8.37 cm-1), with output power ranging from 3.2 mW (at threshold current) to 39.1 mW (at near-rollover current). Since the laser is capable of operating at 35 °C, even broader wavelength tuning is also achievable.
Click to Enlarge DFB QCL Center Frequency as Function of Temperature and Drive Current