Visible Range Tunable Diode Laser 636 nm +- 1nm
1.Mode-hop free fine tuning range of +50-70 pm from the center wavelength
2.Mode-hop free wide tuning range of at least 3 nm
3.Center wavelength of operation at 636 nm +1nm
4.Free-space output power of at least 7 mW at any wavelength within the tuning range
5.The laser head shall have an FC/APC PM fiber connector attached to it
6.Fiber-coupled output power of at least 2 mW at any wavelength within the tuning range
7.Tuning speed of at least 5 nm/s
8.Linewidth of at least 200 kHz
9.Wavelength stability of 1-3 pm over 1 hour
- Power variations of 0.5-1.5% over 1 hour
- Better than 30 dB isolation
- The laser unit shall have a wide range motorized tuning mechanism
- The laser unit shall have a fine range piezo tuning mechanism
- The entire system shall include a low-noise controller
What are Tunable Lasers? Tunable DPSS lasers use an Optical Parametric Oscillator (OPO) to produce tunable wavelengths in the 410 – 2300 nm range. This laser offers nanosecond (ns) pulse widths and a variable repetition rate up to 100 Hz, with up to 5 mJ pulse energy in the visible range.
Most laser diodes can be tuned over a few nanometers by varying the junction temperature, but some special types such as external-cavity diode lasers and distributed Bragg reflector lasers can be tuned over 40 nm and more with additional means such as an intracavity diffraction grating.
The method uses a semiconductor laser as a coherent light source, and uses a cavity mirror with high reflectivity to form a resonant cavity to achieve an extremely long effective absorption optical path, and detects the target gas by detecting the time-integrated light intensity passing through the cavity.
