Carmel - Compact Fiber Based Femtosecond Laser (CFL)

Multiphoton Microscopy Femtosecond Laser

The Carmel X-series of femtosecond fiber lasers provides high power, ultrashort pulses, and exceptional stability in the industry’s most compact package for OEM, scientific and industrial applications. The X-920 is the latest member of the product family with pulse widths < 150 fs and over 600 mW of output power at 920 nm, an ideal wavelength for multiphoton imaging of green fluorescent protein variants.

The Carmel X-series is a range of high power, air-cooled, 780 nm, 920 nm or 1550 nm fiber-based femtosecond lasers with output powers from 0.2 to greater than 1.0 W. With pulse widths of less than 90 fs in a small user-friendly package, the Carmel provides the perfect source for a wide range of ultrafast laser applications, including bio-imaging, multiphoton microscopy, optical metrology, 3D-microprinting, terahertz imaging and ophthalmology.

The system features a rack mountable controller with a robust armored cable interface to the compact laser head, which facilitates its incorporation into OEM designs. It is over 100 times smaller than many Ti:sapphire lasers with a similar output power level. A simple key switch interface provides for manual operation with full remote access through computer control. The X-series includes the capability of remote data logging, power monitoring, system diagnostics, and automated adjustment of the second harmonic crystal for prolonged lifetime and OEM service support. The rugged design supports 24/7 operation with an expected lifetime of > 10,000 hours.

The Carmel can be configured for dual wavelength output to enable alternating between 780 and 1550 nm outputs. The repetition rate can be specified from 10 to 80 MHz with a clean pulse width of < 90 fs, and outstanding beam quality (M² < 1.2). Excellent long term pulse-to-pulse stability (<1% rms) over a wide operating temperature range (17-30°C) ensures superior results for both tissue imaging and ablation in biomedical applications. An RF synchronization output is also provided as a trigger signal.

For multiphoton microscopy applications, the Carmel provides an ideal ultrafast laser solution for optimum cellular tissue imaging with minimal scatter and reduced risk of photodamage. The compact laser head and associated armored fiber cable make for straight forward integration into existing microscopes with minimal delivery optics.

The building block of the X-series is Calmar’s renowned ultrafast fiber laser seed platform, which utilizes the company’s proprietary passive mode-locking technology developed and perfected over a fifteen-year period. This ensures reliable startup, stable long term performance, and many hours of maintenance-free operation.

Central Wavelength (nm) X-780 X-920* X-1550
Pulse Width1 (fs) < 90 < 150 < 90
Average Power (W) 0.25 - 1.0 0.6 0.5 - 2.5
Pulse Energy2 (nJ) Up to 12.5 Up to 7.5 Up to 50
Nominal Repetition Rate3 (MHz) 10 - 80 80 10 - 80
Polarization Extinction Ratio (dB) > 25 > 25 > 18
Beam Diameter (mm) 1.6 1.0 1.6
Beam Quality (M2) <1.2 <1.2 <1.1
Cooling Air cooled
Laser Head Dimensions (cm) 9(w)x18(d)x3.5(h)
Warm up time 10 minutes (typ)

Key Carmel Applications Include:

  • Multiphoton microscopy
  • Bio-imaging
  • Optical metrology
  • Materials characterization
  • Terahertz radiation
  • 3D microprinting
  • Non-linear optical studies
  • Ophthalmology
  • Replacement of a Ti:Sapphire oscillator

* Preliminary Specifications

1 A sech2 pulse shape (deconvolution factor of 0.65) is used to determine the pulse width for the second harmonic autocorrelation trace.

2 The absolute pulse energy will depend on the version and specified repetition rate.

3 For the 780, 1W version, the repetition rate is 80 MHz, otherwise the repetition rate needs to be specified at the time of purchase.

Due to our continuous improvement program, specifications are subject to change without notice

Other Calmar products used for multiphoton microscopy and laser spectroscopy include:

Cazadero (FLCPA Series) High pulse energy fiber based femtosecond laser with:

  • Up to 30 µJ pulse energy @1030 nm
  • 370 fs – 20 ps pulse width (adjustable)
  • 120 kHz - 1 MHz repetition rate (selectable)

Mendocino (FPL Series) Femtosecond fiber seed lasers with:

  • 0.5 – 50 mW average power for most models
  • 0.1 – 10 ps pulse width for most models
  • 10 - 100 MHz repetition rate for most models
  • Available in 780 nm, 1030 nm, and 1550 nm

Address: 951 Commercial Street, Palo Alto, CA 94303, USA

Phone: +1 650.272.6980

Fax: +1 650.272.6988

Sales: +1 650.272.6980 x 110


"Calmar's products have continued to perform well, even after several years, and are much lower maintenance than our other mode-locked lasers"

David J. McCormick